In Wyoming, onsite wastewater (septic) systems are regulated by Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program, which sets the statewide code; some counties are delegated to issue permits and inspect locally, others are handled directly by the state agency. Installing, replacing or repairing a septic system here means, in sequence: a site and soil evaluation, a design, a permit application, an inspection while the system is open, and a final as-built record once it is approved.
The state-level regulator is Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program (official program page). DEQ is the direct permitting authority for small wastewater/septic systems (under the Small Wastewater Facility General Permit) in Campbell County (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties. Other counties/jurisdictions have their own designated permitting authority for individual sewage disposal systems, so authority varies by county.
The statewide onsite-wastewater code is cited as Wyoming Water Quality Rules and Regulations, Chapter 25 ("Septic Tanks, Soil Absorption Systems, and Other Small Wastewater Systems"), promulgated under Wyo. Stat. 35-11-103(c)(ix). We link the agency's own page above rather than restating specific numeric requirements from it, since those change by rule revision and by local amendment.
The order of operations is broadly consistent across the country, even though the specific numbers in each step vary by state and often by county. None of the figures below are specific to Wyoming; treat this as the shape of the process, and get the actual numbers from the agency linked above or from the county office.
We have not verified the specific licensing regime for Wyoming against an official source. Check with Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program directly.
Septic records in Wyoming are generally held by the county or local health jurisdiction that issued the permit, not by the state agency, and are released under the state's public records law. We have not logged the specific statute name and response deadline for Wyoming yet; check with the county office listed on its records page below, or with Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program.
We hold 4,173 septic records across 10 of 23 Wyoming counties. Each county page below shows exactly where its records are kept and how many we hold.
| County | Records held |
|---|---|
| Natrona | 4,042 |
| Big Horn | 52 |
| Park | 38 |
| Laramie | 15 |
| Hot Springs | 7 |
| Teton | 6 |
| Converse | 5 |
| Albany | 5 |
| Uinta | 2 |
| Campbell | 1 |
Full Wyoming county-by-county index · Open the parcel map
Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program. DEQ is the direct permitting authority for small wastewater/septic systems (under the Small Wastewater Facility General Permit) in Campbell County (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties. Other counties/jurisdictions have their own designated permitting authority for individual sewage disposal systems, so authority varies by county.
The sequence is a site and soil evaluation, a design sized from the evaluation and (under most state codes) bedroom count, a permit application, an inspection before backfill, and a final as-built filed once the system is approved. Exact numeric requirements are set by the agency's own code, not restated here.
Check with Wyoming Department of Environmental Quality (DEQ), Water Quality Division, Water and Wastewater Program, which administers licensing for onsite wastewater installers here.
Septic records are generally held by the county or district health office that issued the permit. See our county-by-county Wyoming index for the specific office and portal in each county.
Regulatory information on this page was researched against official state agency sources and last verified 2026-08-31. It is informational only: the agency linked above is authoritative, and requirements can change. We are not lawyers, not a government body, and not affiliated with, licensed or certified by any agency named on this page.