State guide
Wyoming
Wyoming’s small wastewater permitting is split between the Department of Environmental Quality and local permitting authorities. DEQ directly permits small wastewater systems only in certain counties, while many other counties or local public-health entities issue the permits and publish their own application packets and fees.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Who regulates septic permits
- Wyoming regulates onsite wastewater through the Department of Environmental Quality’s Water Quality Division, but many counties or local permitting authorities issue small wastewater permits under local delegation or separate local authority.
- Who can do the soil or perc test
- Official Wyoming county materials require groundwater observation cuts and percolation tests for conventional systems, but the pages found do not show a single statewide licensure list for soil evaluators; local pages instead reference owners, applicants, licensed installers, or county-approved local procedures.
- Official septic permit page
- Official page →
- State fee
- Not published by an official source we could verify. Ask the office.
Official resources in Wyoming
State page for small wastewater permit jurisdiction, application steps, and district engineer contacts.
Explains the overall permitting program and notes which counties’ small wastewater permits are in DEQ’s archive.
County delegated-permit page with application package, overview steps, and local contacts.
County page with permit process, application package, percolation-test prep guidance, and local fee.
Local permitting page with permit applications, regulations, and installer lists for Laramie County.
Key facts for Wyoming
- DEQ says a permit is required for installation, repair, or replacement of small wastewater systems.
- DEQ says it is the permitting authority in Carbon, Niobrara, Platte, and Weston Counties, plus Campbell County for commercial systems only.
- Park County says DEQ delegated small wastewater permitting authority to the county.
- Uinta County says wastewater systems must be installed by a licensed installer, though owners may install their own system under county guidance.
- Uinta County publishes a Small Wastewater Permit application fee of $150.00.
- Park County’s application package requires a groundwater exploration pit and percolation testing data for conventional systems.
County septic and soil-evaluation offices in Wyoming
| County office | city | phone | Details |
|---|---|---|---|
| Wyoming Department of Environmental Quality - Small Wastewater Systems | Cheyenne | 307-777-7075 | State page explains DEQ jurisdiction, application steps, and district engineer contacts for DEQ-permitted counties. |
| Park County Planning and Zoning Department - Small Wastewater Systems Park | Cody | (307) 527-8540 | County page says Park County is a delegated official and provides the septic permit application package for conventional systems. |
| Uinta County Planning & Zoning - Wastewater / Septic System Uinta | Evanston | 307-783-0360 | County page gives the local process, application package, percolation-test prep pamphlet, and a published $150.00 permit fee. |
| Cheyenne Laramie County Public Health - Small Wastewater Laramie | Cheyenne | 307.633.4090 | Local public-health page says all small wastewater systems must be permitted before installation, repair, or modification. |
| Teton County Public Works Teton | Jackson | 307-733-3317 | County public works page links the Sep.OS septic permitting portal used for applications and permits. |
* Not published: the official page doesn't list it. Call the office to confirm before you rely on it.
What to do next
- Before testing or designing anything, confirm whether your parcel is in DEQ jurisdiction or a delegated county jurisdiction.
- Ask the local permitting authority which packet to use, because counties may require their own application package, fee, and inspection sequence.
- For conventional systems, expect to gather a site plan, groundwater observation cut information, and percolation test results before permit review.
Not seeing your county office or county?
Not every county office publishes its rules online. Try these, in order:
- General Start with the statewide information above.
- Closest verified Nearest places where we have verified local data outside this state (distance from Wyoming's population center, for comparison only):
- Larimer County Department of Health and Environment - Septic Systems (OWTS), Colorado · about 184 miles
- Custer County Planning Department, South Dakota · about 189 miles
- Lawrence County Planning & Zoning, South Dakota · about 194 miles
- Call to confirm Ask the official office.Wyoming DEQ - Water & Wastewater
Website →Phone: (307) 777-7937 (as listed on that page, checked Oct 4, 2026)Your city or county office: Wyoming County Commissioners Association →Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Wyoming page on USA.gov can point you to the right office. - Know the current info? Tell us with a link to the official page.