Bolthole Index

Fremont County, Wyoming

Zoning, building permits and septic rules in Riverton, Wyoming

Riverton, Wyoming runs its own planning and zoning through the city's Community Development Department1, and the city adopts its own building codes, including the 2024 International Building and Residential Codes with local amendments2. Fremont County has no countywide zoning or county building code, so its relaxed rules do not follow you into city limits3. We could not confirm who issues septic permits inside the city; ask the city and the Fremont County Planning Department.

At a glance

Zoning
Yes, city zoning with 14 districts, administered by Riverton Community Development14
Building permits
City-run permit and inspection process with an online portal; the county issues no building permit for unincorporated land53
Building code
City adopts the 2024 IBC and IRC with local amendments2
Septic
Not confirmed inside city limits; Fremont County permits small systems in its jurisdiction6
Sewer connection
Required for occupied lots within 200 feet of a city sewer main7
Wells
State Engineer permit required before drilling8

Who to call

Septic permits

Fremont County Planning Department (small wastewater, floodplain, subdivisions)

Small wastewater (septic) permits and inspections, floodplain zoning, and subdivision review for Fremont County

(307) 332-1077

[email protected]

450 North 2nd Street, Room 360, Lander, Wyoming 82520

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Off-grid gear

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

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Does Riverton, Wyoming have zoning?

Yes. The City of Riverton administers planning and zoning inside its limits through the Community Development Department1. The city is divided into 14 zones4, so what you can build on a lot, from a house to a shop to an RV, depends on that lot's district. Land inside Riverton is not covered by the county's lighter approach: Fremont County states that it has no countywide zoning, and that the incorporated cities have their own zoning and building codes9.

We could not confirm Riverton's rules on minimum lot size, setbacks, accessory dwellings, RV or tiny-home occupancy, so ask Community Development for the district standards on any specific parcel before you make an offer. Subdividing land inside the city also runs through the city, which publishes subdivision plat applications and checklists10.

Do you need a building permit in Riverton, WY, and who issues it?

Building permits inside Riverton come from the city, not Fremont County. The city adopts its own technical codes, including the 2024 International Building Code and a 2024 International Residential Code that excludes Chapter 11, with local amendments and deletions2. Its Permits & Inspections page offers an online permit portal, a building permit application, mobile-home requirements, temporary permit applications and inspection procedures5.

We could not confirm the city's exact permit thresholds, whether owner-builders get an exemption, or its certificate-of-occupancy rules, so treat a permit as expected for new construction until Community Development says otherwise. Fremont County does not issue certificates of occupancy11, which is a county rule for unincorporated land, not a statement about the city.

How do septic permits and sewer connection work in Riverton?

Inside Riverton, the first question is whether a city sewer main is close. Occupied lots within 200 feet of a city sewer main must connect by a sewer service line, and no privy vault or cesspool may be kept on the lot7. Sewer connection also takes a written city permit7.

For a lot farther from the main, we could not confirm whether the city or Fremont County permits a septic system. Fremont County requires a permit for small wastewater systems under 2,000 gallons per day6, and recommends a pre-permit conference with its small wastewater specialist before you buy because soil conditions change a lot across the county12. Call the13 and Riverton Community Development to learn which of them applies to your address.

Can you live in an RV or tiny home in Riverton?

We could not confirm Riverton's rules on RV occupancy, temporary camping or tiny homes. The city's zoning includes a mobile home park district, and it publishes mobile-home requirements and a temporary permit application45, but the operative limits were not available to us. Ask Riverton Community Development whether your district allows living in an RV or a tiny home, and for how long, before you move one onto a lot.

Building a home in Riverton: the steps, in order

  1. Ask Riverton Community Development which zoning district the lot is in and what that district allows1.
  2. Check whether a city sewer main is within 200 feet of the lot; if so, plan on a city sewer connection7.
  3. If no sewer is near, book a pre-permit conference with the Fremont County small wastewater specialist before you buy12.
  4. If you need a well, file a U.W. 5 application with the Wyoming State Engineer and wait for an approved permit before drilling8.
  5. Apply for a building permit through the city's Permits & Inspections page and follow its inspection procedures5.

What stays with Fremont County when you buy in Riverton?

The county's no-zoning, no-building-code approach covers unincorporated land only; see the Fremont County page for those rules. Floodplain is one county rule that touches Riverton: FEMA-designated flood hazard zones around Riverton fall under Fremont County floodplain zoning regulations9, and any development in a floodplain needs a Floodplain Development Permit application before work starts14. Wells are a state matter: Wyoming requires a State Engineer permit before drilling a domestic well, with a $50 filing fee8.

For county-level costs, Fremont County's effective property tax rate is 0.6%15.

Watch-outs

  • Fremont County's no-zoning, no-building-code rules apply to unincorporated land, so do not rely on them for a lot inside Riverton city limits3.
  • We could not confirm who permits septic systems, what setbacks or minimum lots apply, or whether RV and tiny-home living is allowed inside Riverton; ask Community Development and the13.
  • A lot in a FEMA flood hazard zone around Riverton needs a county Floodplain Development Permit before any work14.

Sources

  1. Zoning (Riverton), quoted and re-checked
  2. Chapter 15.04 Building Construction and Maintenance Codes (Riverton), quoted and re-checked
  3. Building Codes & Certificates of Occupancy, quoted and re-checked
  4. Zoning (Riverton), quoted and re-checked
  5. Permits & Inspections (Riverton), quoted and re-checked
  6. Building Codes and Construction Recommendations, quoted and re-checked
  7. ecode360.com (Riverton), quoted and re-checked
  8. Wyoming State Engineer's Office Ground Water Frequently Asked Questions, quoted and re-checked
  9. Building Codes and Construction Recommendations, quoted and re-checked
  10. Subdivisions (Riverton), quoted and re-checked
  11. Building Codes and Certificates of Occupancy, quoted and re-checked
  12. fremontcountywy.gov, quoted and re-checked
  13. Fremont County Planning Department (small wastewater, floodplain, subdivisions) (fremontcountywy.gov)
  14. Floodplain Development Permit Application, quoted and re-checked
  15. Effective property tax rate: Bolthole Index county data

Written October 15, 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 Riverton

Riverton’s own rules

  • Building code adoptedAdopted

    Construction, alteration, maintenance, and repair of buildings and structures within Riverton city limits.

    • The city adopts multiple technical codes, including the 2024 IBC and IRC, with local amendments and deletions.

    IBC edition: 2024 · IRC edition: 2024 (Chapter 11 excluded)

    “International Building Code (IBC), including appendices A, B, C, F, H, I, J, and K, 2024 edition, by International Code Council (ICC).”
  • Local zoningPresent

    Land inside Riverton city limits.

    • The city administers planning and zoning through its Community Development Department.
    “The City of Riverton is divided into fourteen different zones.”
  • Zoning districtsPublished

    Zoning districts and classifications inside Riverton city limits.

    • The city identifies fourteen zones and states that district boundaries and classifications are shown on the city zoning map dated June 12, 2007, as amended.
    • The listed districts include R-1, R-2, R-2A, R-4, Residential PUD, C-O, C-P, C-1, C-H, I-1, I-2, MHP, AG, and AP.

    number of zones: 14

    “The boundaries and zoning classifications of districts established are as shown on a map entitled, Zoning District Map of the city of Riverton, Wyoming, dated June 12, 2007, as amended from time to time.”
  • Mandatory utility hookupSewer (with conditions)

    Occupied lots or land inside Riverton city limits located within 200 feet or less of a city sewer main.

    • Connection is required for occupied lots within 200 feet or less of a city sewer main.
    • No privy vault or cesspool may be maintained, kept, or continued on such land.
    • The owner may appeal a notice to connect to the city council within 14 days.
    • Failure to connect within 30 days after notice, or after an unsuccessful appeal, is a violation.
    • A written city permit is required for sewer connection.

    distance to sewer main: <= 200 feet

    “All occupied lots or parts of lots or land in the city within 200 feet or less of a sewer main of the city shall be connected by a sewer service line, in the manner as provided in this chapter, and no privy vault or cesspool shall be maintained, kept or continued thereon.”
  • Subdividing landRegulated (with conditions)

    Land subdivision inside Riverton city limits.

    • The city publishes minor-subdivision and subdivision plat applications and checklists.
    • Requirements depend on the applicable zoning district and subdivision process.
    “minor subdivision plat checklist minor subdivision plat application subdivision plat application subdivision plat checklist”
  • Permit processPartial

    Building-permit and inspection process inside Riverton city limits.

    • The city provides an online permit portal and links for permit requirements, building applications, mobile-home requirements, temporary permit applications, and inspection procedures.
    • The operative contents of the linked forms were not retrieved.
    “Permit Requirements Building Permit Application Mobile Home Requirements MHP Permit Application TMP Permit Application Inspection Procedures”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Riverton or Fremont County directly.

  • Building permit — Building permits for construction inside Riverton city limits.
  • Owner-builder exemption — Owner-builders performing construction inside Riverton city limits.
  • Inspections — Building inspections inside Riverton city limits.
  • Certificate of occupancy — Certificates of occupancy for buildings inside Riverton city limits.
  • Minimum dwelling size — Residential districts inside Riverton city limits.
17 more unanswered
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • 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.

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

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