Washington County, MS: Owner-Builder Allowed

Construction work in unincorporated Washington County, Mississippi requires a building permit; start with county Planning, Zoning & Engineering to identify the applicable process^1,2. Inside Greenville, the city handles building permits and zoning; outside city limits, ask county Planning which zoning rules cover the parcel^2,3,4. Septic permits throughout Washington County come from the Mississippi State Department of Health (MSDH)⁵.

At a glance

Building permit: Required for construction work; use county Planning or the applicable city building office^1,2,6
Zoning: County records document zoning districts, but the complete current map and district schedule were not confirmed⁷
Septic permit: Required through the Mississippi State Department of Health for a new onsite system^5,8
Owner-builder: A licensing exemption may cover work on your own residence, but it does not waive permits or other approvals⁹
RV or tiny home: Private-land occupancy rules are not confirmed; ask county Planning about the parcel²
Septic soils: Only 0.1% of county soils lack severe limits for a conventional drain field¹⁰
Wastewater: Gray water and other wastewater must go to sewer or septic, not onto the ground¹¹

Who to call

Planning & zoning

Washington County Planning, Zoning & Engineering Department

Land use, development review, building policies, zoning issues, floodplain administration, engineering standards, and right-of-way, special transport and access permits

662.334.2647

rjohnson@co.washington.ms.us

Septic permits

Mississippi State Department of Health, Division of On-Site Wastewater

Onsite wastewater applications, soil and site evaluations, permit recommendations, inspections and complaints

855-220-0192

wastewater@msdh.ms.gov

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit in Washington County, Mississippi?

Construction work in unincorporated Washington County requires a building permit; start with the Washington County Planning, Zoning & Engineering Department for the applicable building-permit process^1,2. Inside Greenville, the city issues building permits before construction, alteration, demolition and land development begin; septic permits remain with MSDH^3,12. We could not confirm the county’s building-permit triggers, application form, inspection sequence, certificate-of-occupancy rule or building-permit fees; ask county Planning what the project requires². Mississippi’s owner-builder and agricultural-building exemptions concern residential-builder licensing and do not waive building permits, inspections, zoning approval, septic permits or utility requirements⁹.

Who issues building permits in Washington County?

For unincorporated Washington County, contact the Planning, Zoning & Engineering Department at 662.334.2647 or rjohnson@co.washington.ms.us about building policies and development review.

For unincorporated Washington County, contact the Planning, Zoning & Engineering Department at 662.334.2647 or rjohnson@co.washington.ms.us about building policies and development review². County Planning also oversees floodplain administration and coordinates right-of-way, utility and access permits². Ask county Planning which building, zoning, floodplain and county-access approvals the project needs because its published material does not provide a complete workflow². Greenville handles its own building permits, while MSDH administers septic permits throughout Washington County^3,5.

Does Washington County have zoning?

Washington County records document zoning districts, including A-1, C-3 and RE1, and county Planning handles zoning issues and land-use review.

Washington County records document zoning districts, including A-1, C-3 and RE1, and county Planning handles zoning issues and land-use review^2,7. For unincorporated Washington County, we could not confirm the complete current zoning map, district schedule, geographic coverage, minimum lot size, setbacks, lot coverage, building height or minimum dwelling size; ask county Planning which rules cover the parcel². Inside Greenville, the city sets zoning through Appendix B of its ordinance; septic permits still come from MSDH^4,12. County Planning oversees floodplain administration, but the published material does not state development thresholds or numerical standards².

How do septic permits work in Washington County?

The Mississippi State Department of Health administers onsite wastewater permitting throughout Washington County, including inside municipalities, and a new system requires its Permit/Recommendation.

The Mississippi State Department of Health administers onsite wastewater permitting throughout Washington County, including inside municipalities, and a new system requires its Permit/Recommendation^5,8. Submit the application, property documents, plot plan and fee; MSDH performs the soil and site evaluation¹¹. The Notice of Intent plus Final Approval fee is currently $197.50, with an online processing fee and possible future changes¹¹. If a sewer line is within 1 mile, MSDH requires the provider's rejection letter before continuing a septic application¹¹. For a qualifying new single-family residence installing septic for the first time, the first residence on at least 2 acres or second residence on at least 5 acres may qualify for an inspection/final-approval exemption; the owner must still apply and install the MSDH-permitted system¹¹. Only 0.1% of county soils lack severe limits for a conventional drain field, so arrange the site evaluation before relying on a standard system¹⁰.

Can you live in an RV or tiny home in Washington County?

We could not confirm a Washington County rule allowing or prohibiting full-time RV living, temporary camping or tiny-home occupancy on private land.

We could not confirm a Washington County rule allowing or prohibiting full-time RV living, temporary camping or tiny-home occupancy on private land. Ask the Planning, Zoning & Engineering Department for the parcel's zoning district and occupancy rules before buying or moving a unit onsite². Septic rules still apply to alternative living arrangements: MSDH treats a house, trailer, manufactured home or similar single-family residence as a residential application, while developments with multiple trailers, cabins or RVs may need a commercial-development application¹¹. A permanent water-meter connection requires a permanent sewage-disposal solution through sewer or septic¹¹. Mississippi requires all wastewater, including gray water, to be piped to a central sewer or septic system and prohibits discharge onto the ground, into ditches or into bodies of water¹¹.

Building a home in Washington County: steps in order

Identify whether the parcel is in unincorporated Washington County or inside city limits, then ask the applicable planning office for the building-permit and zoning-approval process.

Identify whether the parcel is in unincorporated Washington County or inside city limits, then ask the applicable planning office for the building-permit and zoning-approval process^1,6.

For a county-jurisdiction parcel, ask Washington County Planning about zoning, floodplain review and access requirements².

Determine whether public sewer is available; a permanent sewage solution is required before a permanent water meter can be connected¹¹.

If septic is needed anywhere in Washington County, submit the MSDH application, property documents, plot plan and fee before finalizing the house location^5,11.

Ask county Planning whether county-road access approval applies, and obtain an MDOT driveway permit for access to a state highway^2,13.

If acting as your own general contractor, confirm that the owner-builder licensing exemption fits the project without treating it as a waiver of building permits or inspections⁹.

What should you check before buying land in Washington County?

Before buying unincorporated Washington County land, ask county Planning to confirm zoning coverage, floodplain status and road-access requirements.

Before buying unincorporated Washington County land, ask county Planning to confirm zoning coverage, floodplain status and road-access requirements^2,7. Washington County’s building-code opt-out status and adopted edition remain unconfirmed; ask county Planning which code applies¹⁴. Mississippi does not require a septic inspection solely for a property sale, but MSDH recommends one; an advanced treatment system also needs its tank inspected by a certified manufacturer’s representative or installer¹¹. For land splits, MSDH generally defines a subdivision as 10 or more lots, but county ordinances may lower the threshold; public water can trigger Bureau of Public Water Supply review regardless of lot count¹¹. Subdivisions exceeding 35 lots, or adding a new phase, require a wastewater feasibility study; ask MSDH and county Planning about review before dividing land^2,11.

Watch-outs

Construction work in Washington County requires a permit, but the county's published page does not state the triggers, inspection sequence or certificate-of-occupancy rules; ask county Planning before work begins^1,2.
A sewer line within 1 mile can redirect an MSDH septic application to the sewer provider unless that provider issues a rejection letter¹¹.
Only 0.1% of Washington County soils lack severe limits for a conventional drain field, so do not assume a standard septic layout will work¹⁰.

Sources

14 official pages, each quoted and re-checked · written October 11, 2026

Written October 11, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Off-grid gear

Going off-grid in Washington County means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

Compared with neighboring counties

Rule	Washington County	Humphreys County	Sharkey County	Sunflower County	Issaquena County	Leflore County	Bolivar County
Building permit	Required	Not published	Not published	Not published	Required	Not published	Required
County zoning	Yes	Not published	No	No	Not published	Not published	Yes
Septic permits	MSDH	MS State Dept. of Health	MS State Dept. of Health	MS State Dept. of Health	MS State Dept. of Health	MSDH	MS State Dept. of Health

Cities and towns in Washington County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet covered: Town of Metcalfe

Answers from the rulebook for Washington County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Washington County rules

Zoning districtsPartial
Published or documented county zoning districts in Washington County.
- The opened official minutes identify A-1, C-3, and RE1 districts but do not provide the complete current zoning map or district schedule.
documented zoning district: A-1 · documented zoning district: C-3 · documented zoning district: RE1
“IN RE: ORDER APPROVING VARIANCE REQUEST OF BELVIS GOODMAN OF 212 WILMOT ROAD TO REPLACE A DILAPIDATED SINGLE FAMILY DWELLING WITH A MOBILE HOME ON 1.16 ACRES, ZONED RE1(RESIDENTIAL ESTATE DISTRICT)”
Washington County Board of Supervisors Minutes, August 6, 2012 ↗Re-checked Sep 29, 2026
Driveway accessLimited
Right-of-way, traffic, and access permits administered or coordinated by Washington County.
- The county page refers to access permits generally and does not state that every driveway requires a permit or provide numeric access standards.
“Responsibilities include planning and designing public works projects that include road and bridge, parks, and natural resources improvements; reviewing and enforcing engineering standards; providing surveying, construction, right-of-way, traffic and support engineering; overseeing floodplain administration and improvement district administration; and coordinating right-of-way (utility), special transport, and access permits.”
Planning, Zoning & Engineering ↗Re-checked Sep 29, 2026
Building in a floodplainLimited
Floodplain administration and development review in Washington County.
- The county page states that it oversees floodplain administration but does not publish the operative county ordinance, permit thresholds, or numeric standards.
- Applicable state floodplain rules may impose additional requirements, including floodway and recreational-vehicle restrictions.
“The departments provide proposals, advice and assistance on land use, development review, building policies and zoning issues. [...] Responsibilities include planning and designing public works projects that include road and bridge, parks, and natural resources improvements; reviewing and enforcing engineering standards; providing surveying, construction, right-of-way, traffic and support engineering; overseeing floodplain administration and improvement district administration; and coordinating right-of-way (utility), special transport, and access permits.”
Planning, Zoning & Engineering ↗Re-checked Sep 29, 2026
Permit processPartial
County planning, zoning, engineering, right-of-way, access, and floodplain permit administration.
- The county page identifies departments and general responsibilities but does not provide a complete application workflow.
“Responsibilities include planning and designing public works projects that include road and bridge, parks, and natural resources improvements; reviewing and enforcing engineering standards; providing surveying, construction, right-of-way, traffic and support engineering; overseeing floodplain administration and improvement district administration; and coordinating right-of-way (utility), special transport, and access permits.”
Planning, Zoning & Engineering ↗Re-checked Sep 29, 2026
County-wide zoningPresent
The county Planning, Zoning & Engineering department handles land use, development review and zoning issues for the county.
Washington County Planning, Zoning & Engineering ↗From the county’s own site, awaiting a second reviewer

Mississippi rules that apply here

Building permitRequired
Commercial places of Public Assembly subject to the Mississippi Fire Prevention Code.
- Permit/compliance inspections are required for buildings defined in Miss. Code § 45-11-101(a-f), pursuant to Miss. Code § 45-11-105(2).
- The code applies to buildings used for public assembly except where a county or municipality has adopted a fire-prevention code with standards not less stringent than the Mississippi Fire Prevention Code; the local provisions and enforcement mechanism apply instead.
- Permit fees are not less than $400 and include, but are not limited to, each on-site inspection, attorney fees, architect or engineer plan-review fees, and other fees and reasonable and necessary travel expenses.
- The regulation supersedes prior versions of Mississippi Administrative Code Title 19, Part 7, Chapter 7, and became effective January 1, 2025.
permit fee: >= 400 USD (Includes but is not limited to each on-site inspection, attorney fees, architect or engineer plan-review fees, other fees, and reasonable and necessary travel expenses.)
“Permits are required for commercial places of Public Assembly as follows: A. Permit/Compliance inspections are required for all buildings defined in Miss. Code § 45-11-101(a-f) pursuant to Miss. Code § 45-11-105(2).”
Mississippi Administrative Code, Title 19, Part 7, Chapter 7: Mississippi Fire Prevention Code ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Required — Construction work in Mississippi, including Washington County.
  “The new legislation requires all cities and counties to issue permits for construction work.”
  Residential Application and Licensing Information ↗Re-checked Sep 29, 2026
Owner-builder exemptionConditional
Mississippi residential-builder licensing exemption for an owner constructing or acting as general contractor on the owner's own residence.
- The chapter exempts a person undertaking construction or improvement on the person's own residence or acting as the person's own general contractor.
- The exemption is subject to the statutory limits in Section 73-59-15; a person specified in subsection (1)(b) or (c) may not make more than two permit applications for a single residence or construct more than two single residences within one year.
- The exemption concerns residential-builder licensing and does not establish exemption from building permits, inspections, zoning, septic, utility, or other requirements.
maximum permit applications for a single residence within one year: <= 2 applications (Section 73-59-15(2))
“Any person who undertakes construction or improvement on his own residence, or who acts as his own general contractor in the performance of construction or improvement on his own residence;”
Residential Laws and Rules Revised 2022 ↗Re-checked Sep 29, 2026
One more reviewed finding on this topic
- Available (with conditions) — A person undertaking construction or improvement on the person's own residence or acting as the person's own general contractor for construction or improvement on that residence, for purposes of Mississippi residential builder and remodeler licensing requirements.
  “(1) This chapter shall not apply to: [...] (b) Any person who undertakes construction or improvement on his own residence, or who acts as his own general contractor in the performance of construction or improvement on his own residence;”
  Mississippi Senate Journal, March 9, 2022 ↗Re-checked Sep 11, 2026
Building code adoptedPartial
The Mississippi Fire Prevention Code and State Fire Marshal enforcement for state-owned or state-agency buildings, public-assembly buildings, and buildings at least 75 feet high, subject to local fire-prevention-code exceptions stated in the statute.
- The State Fire Marshal's Office adopted the 2024 editions of the International Fire Code and International Building Code effective July 1, 2024.
- The Mississippi Fire Prevention Code applies to all buildings owned by the State or State Agencies.
- It applies to all buildings utilized for public assembly except in a county or municipality that has adopted a fire-prevention code with standards not less stringent than the Mississippi Fire Prevention Code.
- It applies to buildings whose construction permits were issued after the statutory effective date and that are not less than 75 feet in height, unless the county or municipality has adopted a fire-prevention code with standards not less stringent than the Mississippi Fire Prevention Code.
International Fire Code edition: 2024 edition · International Building Code edition: 2024 edition · effective date: 2024-07-01 · height threshold: >= 75 feet (Local fire-prevention code exception applies where stated.)
“AS OF JULY 1, 2024, THE STATE OF MISSISSIPPI – OFFICE OF THE STATE FIRE MARSHAL HAS ADOPTED THE 2024 ADDITION”
Fire Code Enforcement ↗Re-checked Oct 1, 2026
4 more reviewed findings on this topic
- Partial — Mississippi counties and municipalities, including Washington County, under the statewide uniform-building-code framework.
  “Under Senate Bill 2378 of 2014, all counties and municipalities must enact uniform building codes unless they opt out prior to Nov. 30, 2014. Please complete the following information regarding your county or municipality’s building code policies.”
  Mississippi Uniform Building Codes ↗Re-checked Oct 6, 2026
- Adopted (with conditions) — Mississippi counties and municipalities subject to the statewide uniform-building-code requirement, including Washington County unless it timely opted out.
  “Under Senate Bill 2378 of 2014, all counties and municipalities must enact uniform building codes unless they opt out prior to Nov. 30, 2014.”
  Mississippi Uniform Building Codes ↗Re-checked Oct 6, 2026
- Partial — Mississippi counties and municipalities subject to the statewide uniform-building-code framework.
  “Under Senate Bill 2378 of 2014, all counties and municipalities must enact uniform building codes unless they opt out prior to Nov. 30, 2014. Please complete the following information regarding your county or municipality’s building code policies.”
  Mississippi Uniform Building Codes ↗Re-checked Sep 11, 2026
- Partial — Mississippi counties and municipalities, including residential building-code adoption subject to the statewide uniform-building-code framework.
  “Under Senate Bill 2378 of 2014, all counties and municipalities must enact uniform building codes unless they opt out prior to Nov. 30, 2014.”
  Mississippi Uniform Building Codes ↗Re-checked Oct 1, 2026
InspectionsLimited
Pediatric skilled nursing facilities regulated by the Mississippi State Department of Health.
- Upon completion of construction, the Licensing Agency must inspect and approve the facility before occupancy.
- The state and county health departments may access the job site during regular business hours and conduct construction progress inspections as deemed necessary by the agency.
“Upon completion of construction, an inspection shall be made by the Licensing Agency and approval given prior to occupying the building or any part thereof. The state and county health departments shall have access to the job site during regular business hours and shall conduct construction progress inspections as deemed necessary by the agency.”
Mississippi Administrative Code, facility construction and occupancy rules ↗Re-checked Sep 11, 2026
Certificate of occupancyLimited
Pediatric skilled nursing facilities regulated by the Mississippi State Department of Health at final inspection and close-out.
- At final inspection, the State Agency must receive a Certificate of Occupancy or statement of approval from the local building official permitting occupancy for the facility's intended use.
- If there is no local building authority, approval from the local fire authority having jurisdiction must be provided.
- If the facility is state-owned and subject to the State Bureau of Buildings, Grounds and Real Estate Management, approval of occupancy must be coordinated between the state agencies involved.
“A copy of the Certificate of Occupancy or statement of approval from the local building official permitting occupancy of the facility for its intended use. In the absence of a local building authority, approval of a local fire authority having jurisdiction shall be provided. If the facility is owned by the State of Mississippi and subject to the State Bureau of Buildings Grounds and Real Estate Management, approval of occupancy shall be coordinated between the state agencies involved;”
Mississippi Administrative Code, facility construction and occupancy rules ↗Re-checked Sep 11, 2026
SetbacksSpecified
Individual on-site wastewater disposal systems using aggregate disposal systems in Mississippi.
- The 50-foot measurement is the minimum distance from the water edge for all listed non-gravel soil textural classes and for slopes both less than and more than 8 percent.
- Gravel is marked "NOT APPLICABLE."
- The regulation states that these setbacks apply to all individual on-site wastewater disposal systems except spray-irrigation disposal and overland discharge.
- This is an on-site-wastewater setback, not a statewide zoning setback for the dwelling or other structures.
minimum distance from water edge: 50 feet (Aggregate systems in coarse sand, medium sand, fine sand, loamy sand, sandy loam, light loam, heavy loam, silt loam, sandy clay loam, light clay loam, heavy clay loam, light silty clay loam, heavy silty clay loam, sandy clay, silty clay, and clay; both slope categories shown in Table 1.)
“TABLE 1 - SETBACK REQUIREMENTS FROM SENSITIVE WATER (Aggregate Systems) Minimum Distance from the Water Edge [...] Coarse Sand 50 feet 50 feet”
Mississippi State Department of Health, Part 18, Division of On-Site Wastewater, Subpart 77: On-Site Wastewater Regulations ↗Re-checked Nov 4, 2026
Living in an RVLimited
RVs at a hunting camp where the camp uses the Mississippi Department of Health on-site wastewater application process.
- The camp is treated by MSDH as a residential application.
- Three or more trailers, cabins, or RVs on the property must be applied for as a commercial development.
- For a permanent water meter, state law requires a permanent sewage-disposal solution; it may be a sewer line or septic system. If public sewer is unavailable, the applicant must apply to MSDH for the required paperwork.
- Local jurisdictions have separate land ordinances; this claim does not establish a statewide land-use permission for RV occupancy.
trailers/cabins/RVs triggering commercial-development application: >= 3 units (On the hunting-camp property.)
“Yes. This is considered a residential application with us. If there will be three (3) or more trailers/cabins/RVs on the property, this will need to be applied for as a commercial development.”
WasteWater ↗Re-checked Nov 4, 2026
Tiny homesLimited
A tiny house or home intended for use as a residential dwelling that is within the State Fire Marshal's factory-built-home regulation.
- The defined tiny house or home ranges from 80 to less than 400 square feet and may or may not be constructed on a chassis with or without axles or wheels.
- If intended as a residential dwelling, it is treated as a modular home for design and construction requirements and must comply with the most current residential building code adopted by the Mississippi Building Codes Council.
- When designed for permanent installation at its final destination, it must be installed on an approved foundation complying with the manufacturer's installation guidelines concerning manufacturing-facility and retail-entity licensure and occupant-safety installation standards.
- The amended regulation superseded prior versions and became effective July 1, 2026.
- Counties and municipalities may regulate zoning, utility connections, foundations, and permits for modular homes; local land-use controls may therefore add requirements.
tiny-home floor area: 80 to less than 400 square feet (Definition in Rule 3.01.3(42).)
““Tiny House or Home”: Any closed structure, building assembly or systems of assemblies designed for use as a residential dwelling and ranging from 80 to less than 400 square feet in size, which may or may not be constructed on a chassis (with or without axels or wheels).”
Title 19, Part 7, Chapter 3: Rules and Regulations for the Uniform Standards Code for the Factory-Built Homes Law as Related to Modular Homes ↗Re-checked Nov 4, 2026
Manufactured homesLimited
Occupation of Factory-Built homes, including manufactured homes, sited anywhere in Mississippi and installed on or after July 1, 2009.
- The home must undergo inspection under the Mississippi Inspection Program before occupation.
- The inspection is conducted by an inspector assigned by the State Fire Marshal’s Office to verify compliance with the manufacturer’s published installation instructions and Mississippi Installation Standards.
- The retailer/developer and/or installer/transporter must submit a Property Locator/Certificate of Installation Form certifying compliant installation.
- For new or used residential homes involving a retailer, the form and required photographs must be submitted within three business days after installation and before porches, decks, or skirting are installed.
- For secondary sitings without a retailer, the installer/transporter must submit the form and required photographs within three business days after installation and before porches, decks, or skirting are installed.
- All necessary state-law or local-authority-having-jurisdiction permits must be obtained before installation.
- Inspection fees are paid by the installer/transporter, developer, or retailer, not the purchaser; failure to pay an invoice within 45 days is a regulatory violation.
- Factory-Built homes designated and properly certified not to be used for human habitation, such as hunting/fishing camps or storage, are excepted from the human-habitation installation requirements.
installation inspection applicability date: 2009-07-01 · current regulation effective date: 2026-07-01 · certificate submission deadline: <= 3 business days after installation (Must also be before installation of porches, decks, or skirting; secondary sitings without a retailer follow the installer/transporter rule.) · inspection scheduling window: 7 to 10 business days after receipt of Property Locator/Certificate of Installation (May be adjusted for Division resource and manpower shortages.) · inspection invoice payment deadline: <= 45 days from invoice date (Nonpayment is a violation and numerous unpaid invoices may delay or deny license issuance.)
“Beginning July 1, 2009, every Factory-Built home that is sited within the State of Mississippi shall be subject to inspection under the MS Inspection Program prior to occupation.”
MH-5 Uniform Standards Code for Factory-Built Homes Law ↗Re-checked Oct 5, 2026
Who permits septicMixed
Statewide individual onsite wastewater disposal systems; the Mississippi State Department of Health establishes the rules and the appropriate county Department of Health performs local inspections.
- The governing regulation is promulgated under the Mississippi Individual On-site Wastewater Disposal Law.
- Inspection scheduling and inspections are handled with the appropriate county Department of Health.
“Notify the Department at least 48 hours before beginning construction if acting as the Certified Installer of an Individual On-site Wastewater Disposal System and, at that time, schedule a time for inspection of the system with the appropriate county Department of Health.”
Mississippi State Department of Health Current Regulations: On-site Wastewater ↗Re-checked Sep 11, 2026
2 more reviewed findings on this topic
- State — Individual onsite wastewater systems, including systems serving property in Washington County.
  “The On-site Wastewater program develops policy and regulations and provides technical assistance to regional environmentalists in designing and inspecting Individual On-site Wastewater Disposal Systems (IOWDS), recreational vehicle campgrounds/lodging parks, septage pumpers/haulers and individual water supplies.”
  On-Site Wastewater ↗Re-checked Sep 26, 2026
- State — On-site wastewater permitting and administration applicable in Washington County.
  “The On-site Wastewater program develops policy and regulations and provides technical assistance to regional environmentalists in designing and inspecting Individual On-site Wastewater Disposal Systems (IOWDS), recreational vehicle campgrounds/lodging parks, septage pumpers/haulers and individual water supplies.”
  On-Site Wastewater Online Application FAQ ↗Re-checked Sep 29, 2026
Septic permitRequired
Installation of an individual on-site wastewater disposal system serving a residence or other use in Washington County, Mississippi, including unincorporated areas.
- The Mississippi State Department of Health requires a Permit for installation of an on-site wastewater disposal system.
- If a sewer line or sewer service is available, the applicant generally does not apply to MSDH for septic service; sewer systems have first right to provide service, and MSDH may require a Letter of Rejection from the sewer provider before proceeding with an application.
- Residential applications cover one single-family dwelling, including a house, trailer, manufactured home, or similar structure; three or more trailers, cabins, or RVs require a commercial-development application.
- The applicant must submit an application, property deed or survey, plot plan, and applicable fee; MSDH performs a soil and site evaluation and issues a Permit/Recommendation.
- A limited exemption application may be available only for a new single-family residence installing a septic system for the first time: the first residence on a single parcel of at least two acres or the second residence on a single parcel of at least five acres. The applicant must still apply and install a system from the Permit issued by MSDH; the exemption concerns inspection/final approval, not permission to install without applying.
- Current fees listed by MSDH are $197.50 for Notice of Intent plus Final Approval, $100 for Notice of Intent plus Exemption, and $100 for an Existing Residential Inspection. Online payment has a processing fee, and fees are subject to change.
- Local jurisdictions may have separate ordinances or requirements affecting the application.
Notice of Intent + Final Approval fee: 197.5 USD (Fee listed as current by MSDH; online processing fee may apply and fees are subject to change.) · Notice of Intent + Exemption fee: 100 USD (Available only for qualifying new single-family residences; online processing fee may apply and fees are subject to change.) · Existing Residential Inspection fee: 100 USD (Fee listed as current by MSDH; online processing fee may apply and fees are subject to change.) · sewer-line referral distance: <= 1 mile (MSDH states applications within one mile of a sewer line are automatically referred to connect; a Letter of Rejection is required before MSDH can proceed.)
“The Permit is required for a water meter and the installation of an on-site wastewater disposal system.”
FAQs and Answers — WasteWater ↗Re-checked Sep 23, 2026
4 more reviewed findings on this topic
- Required — A new individual onsite wastewater disposal system for a residence in Washington County.
  “The Permit is required for a water meter and the installation of an on-site wastewater disposal system.”
  Notice of Intent: New Individual On-site Wastewater Disposal System ↗Re-checked Sep 26, 2026
- Required — Installation of an on-site wastewater disposal system in Washington County, Mississippi, under Mississippi's statewide MSDH program.
  “The Permit is required for a water meter and the installation of an on-site wastewater disposal system.”
  On-Site Wastewater ↗Re-checked Sep 27, 2026
- Required — New or proposed individual onsite wastewater systems in Washington County where a water meter or installation approval is sought.
  “Environmentalists offer Soil and Site Evaluations that provide property owners with a Permit/Recommendation (required to obtain a water meter) and suitable for installation.”
  On-Site Wastewater ↗Re-checked Sep 29, 2026
- Required — Design, construction, or installation of an individual on-site wastewater disposal system in Mississippi.
  “Approval of the design, construction or installation of an individual on-site wastewater disposal system by the department is required, except as otherwise provided in Section 41-67-6(7).”
  Mississippi Individual On-site Wastewater Disposal System Law ↗Re-checked Nov 4, 2026
Septic inspectionLimited
Installation of an individual on-site wastewater disposal system in Mississippi.
- For the ordinary Notice-of-Intent and Final-Approval process, the certified installer must contact MSDH 24 hours before construction to schedule an inspection.
- A two-acre exemption applicant receives a site evaluation and disposal-system recommendation, but MSDH does not inspect during installation.
- For the two-acre exemption, the Department reserves the right to inspect an installed system after it has been in use for more than 30 days.
- Final approval requires the installer affidavit; advanced treatment systems also require the property owner's maintenance affidavit.
advance notice before construction: >= 24 hours (Certified installer must contact the Department to schedule inspection.) · two-acre-exemption post-use inspection threshold: > 30 days (MSDH reserves the right to inspect systems on properties that filed a two-acre exemption.)
“The Department reserves the right to inspect installed systems after they have been in use for more than thirty (30) days on properties that have filed a two-acre exemption.”
Notice of Intent: New Individual On-site Wastewater Disposal System, Form 908 ↗Re-checked Nov 4, 2026
2 more reviewed findings on this topic
- Not required — Septic inspection as part of a Mississippi real-estate transaction.
  “The State does not require the septic be inspected as part of a real estate transaction. However, MSDH recommends this inspection. Advanced Treatment Systems will also require a certified manufacturer’s representative (i.e. an Installer) to inspect the tank itself as part of this inspection. The county, city, realtor, utilities, loan provider, buyer or seller could request the inspection from us.”
  Wastewater Application FAQ ↗Re-checked Sep 26, 2026
- Limited — Onsite wastewater systems in Washington County, including existing-system inspections and inspections associated with advanced treatment systems.
  “The State does not require the septic be inspected as part of a real estate transaction. However, MSDH recommends this inspection. Advanced Treatment Systems will also require a certified manufacturer’s representative (i.e. an Installer) to inspect the tank itself as part of this inspection.”
  WasteWater Frequently Asked Questions ↗Re-checked Sep 29, 2026
Off-grid sanitationProhibited
Discharge of wastewater or gray water on the ground, in ditches, or in bodies of water.
- Mississippi does not recognize gray water as a separate disposal category; it is classified as wastewater.
- Wastewater must be piped into a central sewer system or septic system for proper disposal.
“All wastewater is required to pipe into a central sewer system or a septic system for proper disposal. No “gray water” can be discharged on the ground, ditches, or bodies of water.”
On-Site Wastewater Online Application FAQ — Sanitation and utility conditions ↗Re-checked Sep 29, 2026
Well permitLimited
Groundwater withdrawal permits for water wells in Mississippi.
- A groundwater withdrawal permit is required for water wells with surface casing diameters of 6 inches or greater.
- Some exclusions apply.
- A separate contractor licensing requirement generally applies, but a landowner may drill without a Water Well Contractor license for a single-family permanent residence or farm livestock use if applicable construction standards are followed.
- Wells with surface casing diameters below 6 inches may still be regulated by the Mississippi State Department of Health when part of a public water system.
surface casing diameter threshold: >= 6 inches (Some exclusions apply.)
“State law requires that you obtain a groundwater withdrawal permit for water wells with surface casing diameters 6-inches or greater in diameter. Some exclusions apply to this requirement.”
Guidelines for Securing the Services of a Water Well Driller ↗Re-checked Sep 11, 2026
Mandatory utility hookupConditional
Public water connections and connection to centralized wastewater treatment systems for residences, buildings, and facilities in Mississippi.
- A public water utility may not connect water service without prior written Department approval certifying that the sewage treatment and disposal plan complies with state law.
- Water utility connections may be made during construction only if the Department approved the sewage plan and the owner agreed to inspection and approval before use or occupancy.
- Where centralized wastewater treatment is constructed and becomes available, onsite systems must be abandoned and residences, buildings, or facilities connected to the centralized system.
- Temporary onsite systems may be used only under the stated 36-month centralized-treatment conditions.
centralized wastewater availability deadline: 36 months (The developer must sign a written agreement to connect when available and install internal sewage collection to the connection point.)
“Where a Centralized Wastewater Treatment System is available, all places shall have a properly constructed connection to the centralized wastewater treatment system which all human excreta and other liquid waste shall be disposed”
Mississippi State Department of Health Current Regulations: On-site Wastewater ↗Re-checked Sep 11, 2026
2 more reviewed findings on this topic
- Conditional — A permanent water-meter connection for property in Washington County.
  “State law requires you have permanent sewage disposal solution available to receive a permanent water meter. Permanent sewage disposal solutions can be a sewer line or septic system. You must have a sewer option before a water utility can make a connection to your property. If public sewer is not available in your area, you will have to apply to us for the proper paperwork.”
  Wastewater Application FAQ ↗Re-checked Sep 26, 2026
- Conditional — Permanent water-meter connection in Washington County.
  “State law requires you have permanent sewage disposal solution available to receive a permanent water meter. Permanent sewage disposal solutions can be a sewer line or septic system.”
  WasteWater Frequently Asked Questions ↗Re-checked Sep 29, 2026
Agricultural exemptionAvailable
Applicability of Mississippi Code Title 73, Chapter 59 residential-builder and remodeler licensing requirements.
- The cited exemption applies to the Residential Builders and Remodelers chapter.
- It covers agricultural buildings, buildings used for agricultural purposes, buildings constructed as a community effort, and tenant houses.
- The source does not establish an exemption from independently applicable local permits, zoning, floodplain rules, or wastewater requirements.
“This chapter shall not apply to: (a) Agricultural buildings, buildings used for agricultural purposes, buildings constructed as a community effort, or tenant houses;”
Mississippi State Board of Contractors, Residential Builders Law ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Available (with conditions) — Mississippi residential-builder licensing exemptions for agricultural buildings and buildings used for agricultural purposes.
  “This chapter shall not apply to: (a) Agricultural buildings, buildings used for agricultural purposes, buildings constructed as a community effort, or tenant houses;”
  Residential Laws and Rules Revised 2022 ↗Re-checked Sep 29, 2026
Subdividing landRegulated (with conditions)
Mississippi State Department of Health review of subdivision land divisions for onsite-wastewater suitability; this does not establish that MSDH approves the general land-use plat or replaces county or municipal plat review.
- A subdivision is defined for this review as land divided into ten (10) or more lots, tracts, sites, or parcels for residential development.
- Local or county ordinances may reduce the ten-lot threshold.
- If public water will be used, the Bureau of Public Water Supply may require subdivision review regardless of lot count.
- Developments of 35 or more lots and additional phases by the same owner require a feasibility study; developments under 35 lots may be required to obtain one case-by-case.
- No lots may be sold or construction started before evaluation.
- The subdivision plan-review fee is $325 plus $6.50 per lot; online payment is subject to a processing fee and fees may change.
- The plan review is voided if the developer alters the plat without notifying MSDH; MSDH determines whether a new review is required.
- MSDH reviews lots for general suitability of onsite wastewater treatment and disposal for one residence per lot; septic, soil, wetland, water-supply, and other health requirements remain applicable.
residential subdivision threshold: >= 10 lots (Local ordinances may reduce the minimum below ten lots.) · feasibility-study threshold: >= 35 lots (Additional phases by the same owner also require a feasibility study; smaller developments may be required case-by-case.) · subdivision plan-review fee: 325 USD (Plus $6.50 per lot; online payment processing fee and possible additional costs may apply.)
“All lots are reviewed for general suitability of on-site wastewater treatment and disposal for a single residence per lot.”
Subdivision Plan Review ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Regulated (with conditions) — Subdivision wastewater review and onsite-wastewater feasibility in Washington County.
  “A subdivision is any development of land into ten (10) or more lots. County ordinances may lower the minimum number of lots. If the development will utilize public water, the Bureau of Public Water Supply may require a subdivision review, regardless of lot count.”
  Wastewater Application FAQ ↗Re-checked Sep 26, 2026
Permit feesPublished (with conditions)
Mississippi Department of Transportation over-dimensional and related permits statewide.
- The published schedule applies to MDOT permit types, not a general statewide building-permit fee schedule.
- Blanket permits are not prorated and are issued for one year unless otherwise specified.
- Blanket permits must have valid insurance or a valid U.S. DOT number; if insurance expires or cancels, the blanket permit becomes invalid.
- Overweight charges apply to weight exceeding 80,000 pounds or specified axle limits.
oversize permit fee: 10 USD · oversize blanket fee: 100 USD · 72-hour legal trip permit fee: 25 USD · harvest permit fee: 25 USD · port permit fee: 170 USD per year · pole blanket fee: 200 USD
“Oversize permit $10.00 Oversize Blanket $100.00”
Mississippi Department of Transportation Permit and Blanket Fees ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- Published (with conditions) — Mississippi on-site wastewater application and related inspection fees applicable to Washington County.
  “Notice of Intent + Final Approval is currently $197.50 Notice of Intent + Exemption is currently $100 Existing Residential Inspection is currently $100 Private Water Well Sample is currently $10”
  On-Site Wastewater Online Application FAQ — Fees and process ↗Re-checked Sep 29, 2026
Campground & park staysLimited
Recreational-vehicle occupancy at campgrounds under the jurisdiction of the Pearl River Valley Water Supply District, including Coal Bluff, Goshen Springs, Leake County Water Park, Low Head Dam, and Timberlake.
- The rules apply within all campgrounds under the District’s jurisdiction.
- Campgrounds are not intended to be permanent domiciles for campground guests.
- A recreational vehicle must be in operable road-worthy condition, properly registered and insured in its domicile state or province, with a current license plate affixed.
- Campers may not stay on any pad longer than 12 consecutive months; Standard Plus campers may move to another available pad after 12 months, but the District is not responsible for making a pad available.
- Campsites are typically designed for trailers or recreational vehicles no longer than 32 feet or wider than 8 feet, subject to the stated RVIA-seal, holding-tank, facility-capacity, and prohibited-unit conditions.
- Primitive camping areas without water, electricity, or sewer are not intended for recreational vehicles.
- No permanent structures may be erected on a campsite; temporary accessibility stairs, stoops, steps, or ramps require the stated approvals and size limits.
- Camping is confined to designated campground or overflow areas, and no more than one camping unit is allowed per pad without Campground Manager approval.
maximum stay on one pad: <= 12 consecutive months (Campers may move to a different available pad after 12 months.) · typical campsite RV length: <= 32 feet (Larger units may be accepted if they satisfy the stated RVIA seal, holding-tank, and facility-capacity conditions.) · typical campsite RV width: <= 8 feet (Larger units may be accepted if they satisfy the stated RVIA seal, holding-tank, and facility-capacity conditions.)
“Campers shall not stay on any pad longer than 12 consecutive months”
General Campground Rules and Policies - Ross Barnett Reservoir ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- Limited — Temporary camping at designated campgrounds under the jurisdiction of the Pearl River Valley Water Supply District.
  “Camping shall be confined to the designated campground or designated overflow areas.”
  General Campground Rules and Policies - Ross Barnett Reservoir ↗Re-checked Sep 11, 2026
county building authorityGeneral
Mississippi county boards of supervisors' authority and obligation to adopt uniform building codes, including in unincorporated county territory, subject to the statutory opt-out framework.
- All counties and municipalities must enact uniform building codes unless they opted out before November 30, 2014.
- A county board of supervisors adopting building codes after July 1, 2008 must adopt as minimum codes codes established and promulgated by the Mississippi Building Codes Council.
- The statewide source does not identify current county-by-county residential permit enforcement or opt-out status.
opt-out deadline: 2014-11-30 · minimum-code requirement for codes adopted after: >= 2008-07-01
“Under Senate Bill 2378 of 2014, all counties and municipalities must enact uniform building codes unless they opt out prior to Nov. 30, 2014.”
Mississippi Uniform Building Codes ↗Re-checked Oct 1, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Local zoning — Municipal zoning within Washington County (Greenville, etc.)
Minimum dwelling size — Minimum dwelling size in unincorporated Washington County
Minimum lot size — Minimum lot size in unincorporated Washington County
Lot coverage — Lot coverage in Washington County.
Building height — Building height in Washington County.

3 more unanswered

Camping on your land
Accessory dwellings
Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Washington County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Mississippi’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt — no permit or water right

Even amid severe Delta aquifer decline there is NO moratorium or closure on new domestic wells; a single-household well (or <6-inch casing) is exempt regardless of volume. Non-domestic/irrigation wells need an MDEQ permit (administered in the Delta via YMD).

Limit: single-household wells exempt from the withdrawal permit

Mississippi Rule 11-7-1.4 Groundwater Withdrawals ↗

Mississippi Delta — MRVA alluvial aquifer (Yazoo-Mississippi Delta district)majority of county
17-county YMD district over the shallow Mississippi River Valley alluvial aquifer; >19,000 permitted irrigation wells and chronic overdraft (governor's Delta Sustainable Water Task Force since 2011). Non-domestic wells need an MDEQ/YMD permit; domestic household wells are exempt. No formal closure. Core decline is the central/lower Delta (Bolivar, Sunflower, Leflore, Washington, Humphreys, Quitman, Tallahatchie).
MDEQ Delta Sustainable Water Resources Task Force; YMD ↗

Regulated-riparian state (large uses permitted). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Mississippi state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Washington County, Mississippi

Is Washington County a good place to live off-grid or homestead?

Washington County scores 60/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and about 26,560 people within a 30-minute drive. Watch-outs: a weaker property-autonomy legal backdrop.

How much does land cost in Washington County, Mississippi?

Land in Washington County runs about $4,488 per acre, based on the latest county data.

What is the water situation in Washington County?

Washington County gets about 56" of rain a year, with severe drought in roughly 11.8% of years. On water rights, Washington County lies in the Mississippi Delta — MRVA alluvial aquifer (Yazoo-Mississippi Delta district) — 17-county YMD district over the shallow Mississippi River Valley alluvial aquifer; >19,000 permitted irrigation wells and chronic overdraft (governor's Delta Sustainable Water Task Force since 2011). Non-domestic wells need an MDEQ/YMD permit; domestic household wells are exempt. No formal closure. Core decline is the central/lower Delta (Bolivar, Sunflower, Leflore, Washington, Humphreys, Quitman, Tallahatchie)..

How remote is Washington County?

A representative private-land location has about 26,560 people within a 30-minute drive and 925,592 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Washington County, Mississippi