Bolthole Index

Spokane County, Washington

Building permits, zoning and septic rules in Medical Lake, Washington

Medical Lake, Washington requires building permits for new construction through the city Building Department, while the city Planning Department handles land-use reviews.12 Inside this Spokane County city, public sewer service can make private septic unlawful; Spokane Regional Health District handles eligible on-site sewage systems.345

At a glance

Building permits
City Building Department; electrical permits through Washington State Labor and Industries1
Zoning
City zoning and land-use review apply inside city limits2
Sewer or septic
Public sewer connection required in the served area; private sewage disposal restricted when sewer is accessible34
Septic authority
SRHD permits and inspects systems using less than 3,500 gallons per day5
Tiny homes
State building-code requirements apply; local approval governs location and installation6
Owner-builder
Conditional state contractor-registration exemption; building permits still apply7

Who to call

Building permits

Medical Lake Building Department

City building permits, building-code enforcement and application forms

(509) 565-5024

Planning & zoning

Medical Lake Planning Department

City zoning questions, land-use applications and pre-application meetings

(509) 565-5019

Septic permits

Spokane Regional Health District — Liquid Waste Program

Septic system permitting and inspections

509.324.1560 ext. 1

1101 W. College Ave. Spokane, WA 99201

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

Off-grid gear

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

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Do you need a building permit in Medical Lake, WA?

Medical Lake issues building permits for new construction and listed building work inside city limits; electrical permits come from Washington State Labor and Industries.1 Medical Lake has adopted building codes with local modifications and amendments, so a city building permit and compliance with construction standards belong in the same project plan.8 Washington’s owner-builder exemption concerns contractor registration for qualifying work on your own property and does not remove building, electrical, plumbing, mechanical, land-use or inspection requirements; work intended for sale, demolition or lease is excluded from that exemption.7

Who issues building permits in Medical Lake, and how do you apply?

Start with the Medical Lake Building Department for city building permits and building-code questions.9 Every building-permit application requires the city’s Building Permit Application, with the corresponding worksheet when mechanical or plumbing units are involved.10 The Building Department accepts payment by cash or check only; ask the department for the current project-specific building-permit fee before submitting payment.9 For land-use review, submit the application and supplemental materials to the Medical Lake Planning Department; applicants can arrange a pre-application meeting with Planning.11

Does Medical Lake have zoning, and what should you ask Planning?

Medical Lake has city zoning, and its Planning Department processes land-use reviews and reviews building permits.211 Before choosing a house footprint, ask Medical Lake Planning to identify the parcel’s current zoning district and applicable lot size, setbacks, coverage and height requirements.11 Bring the proposed use and site layout to a pre-application meeting so the land-use application can be prepared with the required supplemental materials.11 For a proposed lot split, Washington requires subdivisions to comply with state subdivision law and short subdivisions to comply with applicable local regulations; plat approval also requires conformity with zoning or other land-use controls.12

How do septic permits work inside Medical Lake?

Medical Lake requires public sewer connections for structures used or occupied by people on property within the area served by the public sewer system, with connection charges and an approved water and sewer tap permit.3 A septic tank, cesspool, privy or similar disposal facility is unlawful unless public sewer is inaccessible under the city code or declared inaccessible by the public works superintendent.4 Where an on-site system is eligible, Spokane Regional Health District permits and inspects systems using less than 3,500 gallons per day.5 Washington requires a septic application and permit before covered construction begins, except for a minor repair.13

Can you live in an RV or tiny home in Medical Lake?

Medical Lake’s public-park camping rule allows registered, fee-paying visitors to stay overnight with a self-contained trailer, motorhome or tent in the designated Waterfront Park area; that rule applies to park camping.14 We could not confirm permission to live in an RV on a private Medical Lake lot while building; ask the city Planning Department about the proposed residential use before relying on an RV as housing.11 Washington defines a tiny house as a dwelling no larger than 400 square feet, potentially on wheels, built to the state building code; local building-department requirements govern location, foundation and installation.6 Ask Medical Lake Planning and Building to review the specific tiny-home proposal.119

What are the steps before building a home in Medical Lake?

  1. Ask Medical Lake Planning to review the parcel and proposed use, and schedule a pre-application meeting if needed.11
  2. Resolve public sewer service with the city before planning private sanitation; Medical Lake restricts private sewage disposal when public sewer is accessible.34
  3. If a septic system is eligible, obtain the required health-authority approval before septic construction.513
  4. Submit the city Building Permit Application and applicable mechanical or plumbing worksheets, and obtain electrical permits separately through Labor and Industries.101
  5. Arrange sewer-connection inspections before backfilling; under the applicable state energy code, the building also needs final inspection and approval before occupancy.1516

What should you check before buying land in Medical Lake?

For land outside Medical Lake city limits, consult the Spokane County guide: the county building-permit requirement applies to unincorporated land.17 For a proposed private well, Washington’s domestic groundwater water-right permit exemption is limited to 5,000 gallons per day per project, and Ecology must receive a notice of intent 72 hours before drilling; the notice does not approve water use.18 We could not confirm Medical Lake’s parcel-specific private-well requirements; ask Ecology and the city before treating that exemption as sufficient approval.18 SRHD also inspects some new wells and all decommissioned wells in Spokane County.19

Watch-outs

  • Medical Lake building permits do not replace electrical permits from Washington State Labor and Industries.1
  • Public sewer accessibility can rule out private septic or a privy inside Medical Lake; resolve sanitation before buying a lot for off-grid living.4
  • We could not confirm Medical Lake’s private-lot RV occupancy, accessory-dwelling standards or driveway-access requirements; ask the city Planning Department to review those parts of your proposal.11
  • We could not confirm Medical Lake’s certificate-of-occupancy procedure; ask the Building Department what final approvals your project needs.9

Sources

  1. Building Department - City of Medical Lake (Medical Lake), quoted and re-checked
  2. Planning & Zoning Department - City of Medical Lake (Medical Lake), quoted and re-checked
  3. MLMC 12.22.020 - Use of public sewer systems (Medical Lake), quoted and re-checked
  4. MLMC 12.22.020 - Use of public sewer systems (Medical Lake), quoted and re-checked
  5. Septic Systems - Spokane Regional Health District (Medical Lake), quoted and re-checked
  6. Tiny Houses (Washington statewide rule), quoted and re-checked
  7. RCW 18.27.090 — Exemptions (Washington statewide rule), quoted and re-checked
  8. MLMC 14.04.020 - Codes adopted (Medical Lake), quoted and re-checked
  9. Medical Lake Building Department (medical-lake.org)
  10. Building Department - City of Medical Lake (Medical Lake), quoted and re-checked
  11. Medical Lake Planning Department (medical-lake.org)
  12. RCW 58.17.030 — Subdivisions to comply with chapter, local regulations (Washington statewide rule), quoted and re-checked
  13. WAC 246-272A-0200 Permit requirements (Washington statewide rule), quoted and re-checked
  14. MLMC 9.11.060 - Tents or temporary shelters (Medical Lake), quoted and re-checked
  15. MLMC 12.22.030 - Public sewer system connections (Medical Lake), quoted and re-checked
  16. WAC 51-11R-10500 — Section R105—Inspections (Washington statewide rule), quoted and re-checked
  17. Residential Building Permits (2026 county census)
  18. Groundwater permit exemption (Washington statewide rule), quoted and re-checked
  19. Spokane Regional Health District — Liquid Waste Program (srhd.org)

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.

Answers from the rulebook for Medical Lake

Medical Lake’s own rules

  • Building permitRequired

    Permitted construction and listed building work inside Medical Lake city limits.

    • Electrical permits are issued by Washington State Labor and Industries rather than the city.
    • All permits require a Building Permit Application; mechanical or plumbing work also requires the corresponding worksheet.
    “the issuance of all permits inside the city limits.”
  • Building code adoptedAdopted

    Building construction inside Medical Lake city limits.

    • The listed codes are subject to modifications and amendments in MLMC 14.04.030.
    “Pursuant to RCW Chapter 19.27, the following codes are adopted, as now written or hereafter amended”
  • InspectionsLimited

    Building-sewer connections inside Medical Lake city limits.

    • The cited inspection rule concerns sewer connections, not every category of construction.
    • Inspection is required before backfilling.
    • The building inspector and public works superintendent inspect different portions of the connection.
    “prior to backfilling, call for inspection of the building sewer by the building inspector”
  • Local zoningPresent

    Land inside Medical Lake city limits.

    “processing land use reviews, and reviewing building permits.”
  • Lot coverageSpecified

    Lots in the R-1 Single-Family Residential zoning district.

    • Maximum lot coverage includes structures, including dwellings and accessory buildings.

    maximum lot coverage: <= 35 percent

    “Maximum lot coverage is thirty-five percent.”
  • Building heightSpecified

    Buildings in the R-1 Single-Family Residential zoning district.

    • Aerials, chimneys, church spires, cupolas, domes, fire and hose towers, flagpoles, monuments, radio or television antennas, communication towers and associated antennas, water towers, and similar projections are exempt from the maximum-height limitation.

    maximum building height: <= 35 feet (Listed projections are not subject to the limitation.)

    “Maximum building height shall not exceed thirty-five feet.”
  • Camping on your landLimited

    Camping or overnight stays in public parks inside Medical Lake city limits.

    • Camping or staying overnight in a public park when parks are closed is prohibited.
    • Registered and fee-paying persons may park a self-contained trailer, motorhome, or tent overnight in the designated Waterfront Park area.
    • Park rules and RV-specific rules apply.
    “Persons who have properly registered and have paid the applicable fees may park a self-contained trailer, motorhome, or tent”
  • Off-grid sanitationLimited

    Private septic, cesspool, privy, or similar sewage disposal inside Medical Lake city limits.

    • The facility is unlawful when the public sewer system is accessible.
    • It may be maintained only when the public sewer system is inaccessible as defined in MLMC 12.22.020(b) or declared inaccessible by the public works superintendent.
    “unless the public sewer system is inaccessible”
  • Mandatory utility hookupSewer (with conditions)

    Structures for human occupancy or use on property inside Medical Lake city limits within the area served by the public sewer system.

    • Connection is required when the property is within the area served by the public sewer system.
    • A septic tank, cesspool, privy, or similar sewage-disposal facility is unlawful unless the public sewer system is inaccessible as defined in MLMC 12.22.020(b) or declared inaccessible by the public works superintendent.
    • Connection charges and an approved water and sewer tap permit are required.
    “proper connections to be made from the building, land or structure to the public sewer system.”
  • Permit processPublished (with conditions)

    Building and land-use permit applications inside Medical Lake city limits.

    • Building permits require a Building Permit Application.
    • Mechanical and plumbing work requires corresponding worksheets.
    • Land-use applications are submitted with supplemental materials to the Planning Department; pre-application meetings may be scheduled.
    “All permits require a “Building Permit Application” to be completed.”

Rules another office applies inside Medical Lake

Medical Lake does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Who permits septicMixed (with conditions)

    On-site sewage systems inside Medical Lake city limits, administered through SRHD with state rules for larger systems.

    • SRHD permits and inspects systems using less than 3,500 gallons per day.
    • Washington State Department of Health and Washington Department of Ecology enforce regulations for larger sewage systems and systems treating industrial wastewater.

    daily flow threshold: < 3500 gallons per day (Larger systems are handled by Washington State Department of Health and Washington Department of Ecology.)

    “permits and inspects on-site sewage systems using less than 3,500 gallons of water per day.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Medical Lake or Spokane County directly.

  • Owner-builder exemption — Owner-builder exemption from building-permit or contractor requirements inside Medical Lake city limits.
  • Certificate of occupancy — Certificate-of-occupancy requirements inside Medical Lake city limits.
  • Tiny homes — Tiny-home occupancy inside Medical Lake city limits.
  • Accessory dwellings — Accessory dwelling units inside Medical Lake city limits.
  • Well permit — Private well construction or use inside Medical Lake city limits.
5 more unanswered
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

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.

Unanswered questions are usually a sign that Medical Lake publishes no rule on the point, not that none exists. Spokane County’s page lists the county offices to call.

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