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Septic / Small Wastewater System Permit in Unincorporated Sweetwater County, Wyoming

New or replacement septic (onsite wastewater) systems in unincorporated Sweetwater County are permitted through the Sweetwater County District Board of Health's Environmental Health division, not the Land Use building/zoning office. Approval of septic applications is by appointment only.

Verified 2026-07-16 · Source

When you need this permit

  • Obtain and complete the Conventional Septic System Application Package from Environmental Health
  • Schedule an appointment — the county approves all septic applications by appointment only
  • Larger or non-conventional systems may fall under Wyoming DEQ small-wastewater-system permitting rather than the county's conventional-system program

Required documents

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Fee schedule

Filing fee
Not published — contact the department

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Sweetwater County building department
~5–20 business days

How long did your Septic / Small Wastewater System Permit permit actually take in Unincorporated Sweetwater County?

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Inspection process

    Tips

    • Septic approval is handled by the District Board of Health's Environmental Health division, a different office than Land Use — plan for a separate application and appointment.
    • For systems outside the conventional-system program, check Wyoming DEQ's Water Quality Division small wastewater permitting.

    Frequently asked questions

    Unincorporated Sweetwater County requires a septic / small wastewater system permit for: Obtain and complete the Conventional Septic System Application Package from Environmental Health; Schedule an appointment — the county approves all septic applications by appointment only; Larger or non-conventional systems may fall under Wyoming DEQ small-wastewater-system permitting rather than the county's conventional-system program. If your project isn't listed, confirm with Sweetwater County Land Use Department (Planning & Zoning) at (307) 872-3914 before starting work.

    Plan review for a septic / small wastewater system permit in Unincorporated Sweetwater County typically runs 5–20 business days. This is an estimate, not a published figure — confirm current review times with Sweetwater County Land Use Department (Planning & Zoning) at (307) 872-3914.

    You'll need: Conventional Septic System Application Package. See the required-documents checklist on this page for details on each.

    Apply through Sweetwater County Land Use Department (Planning & Zoning) at 80 W. Flaming Gorge Way, Suite 23, Green River, WY 82935. Phone: (307) 872-3914, email: binghame@sweetwatercountywy.gov. Office hours: Monday - Friday, 8:00 am - 5:00 pm. Official information: https://www.sweetwatercountywy.gov/departments/land_use/index.php.

    Unincorporated Sweetwater County, Wyoming has adopted: No countywide building code and no county building permit for private construction. Sweetwater County has not taken delegated building-code enforcement authority under Wyoming Statute 35-9-121; the Wyoming Dept. of Fire Prevention & Electrical Safety's "Local and State Jurisdictions" chart lists Sweetwater County BLDG INSP/PR as state (S/S), meaning the State Fire Marshal, not the county, holds building-code jurisdiction (https://wsfm.wyo.gov/electrical-safety, chart updated 7/7/2026, re-verified 2026-07-16 — Sweetwater County row still reads Fire Insp L / Fire PR S / Bldg Insp S / Bldg PR S / Elec Insp S / Elec PR S; Rock Springs (L across the board) and Green River (Bldg Insp L, all else S) are separate incorporated-city rows and do not apply to this unincorporated-county file).; Confirmed independently on the county's own site: the Land Use Department's page states construction in unincorporated Sweetwater County requires an approved ZONING permit (not an IBC/IRC building-code permit) — 'All residential, commercial, industrial and mineral construction and use in the unincorporated areas of Sweetwater County requires an approved zoning permit' (https://www.sweetwatercountywy.gov/departments/land_use/index.php).; The county's own Development Codes page lists only land-use/zoning instruments — the 2015 Zoning Resolution, Growth Management Plan, Subdivision Regulations, Comprehensive Plan, and Federal Lands and Resources Plan — with no adopted IBC/IRC/NEC building-code edition (https://www.sweetwatercountywy.gov/departments/land_use/development_codes.php)..

    Sources & verification

    Verified against official sources. Last reviewed 2026-07-16.

    Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Unincorporated Sweetwater County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

    Other permits in Unincorporated Sweetwater County

    Zoning/Construction Permit (Land Use) — not a building-code permitCounty Access / Driveway Permit (Public Works — Engineering)Electrical Wiring Permit (State Program)Solar Energy System — On-Site (Rooftop/Ground-Mount PV) — Zoning PermitEV Charger / EVSE PermitSign PermitFire Protection System (Fire Alarm / Fire Sprinkler) Plan Review — State ProgramChange of Use / Establishment Permit (Zoning — No Construction)

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