Septic permit rules and requirements in Wyoming
In Wyoming, the state sets the rule. The septic permit comes from your delegated small wastewater program. For some systems the state issues it itself. The code is Chapter 25, Wyoming Water Quality Rules and Regulations. Wyoming Department of Environmental Quality — Water and Wastewater Program · checked 2026-09-12
Water and Wastewater Program
Writes the rules
checked 2026-09-23
Your delegated small wastewater program
Issues the permit
checked 2026-09-12
Chapter 25, Wyoming Water Quality Rules and Regulations
Code section
checked 2026-09-23
Who decides a septic permit in Wyoming
Your delegated small wastewater program issues an ordinary residential permit. For some systems the state issues it itself. The state sets the floor through the Water and Wastewater Program, Water Quality Division, Wyoming Department of Environmental Quality.
The office issues permits itself in a few counties. Every other county issues its own permits instead.
Wyoming Department of Environmental Quality — Water and Wastewater Program · checked 2026-09-12
The office's phone number is 307-777-7937.
This number sits at the top of the program's page as the main public contact. The page also lists direct lines for each district engineer.
Wyoming Department of Environmental Quality — Water and Wastewater Program · checked 2026-09-23
The office publishes its own page on this: Wyoming Department of Environmental Quality — Water and Wastewater Program.
The page's own canonical tag names this address with the older http scheme. The https address answers with the same page.
Wyoming Department of Environmental Quality — Water and Wastewater Program · checked 2026-09-23
The floor state law sets
The rules that govern every septic system in Wyoming are Chapter 25, Wyoming Water Quality Rules and Regulations — Septic Tanks, Soil Absorption Systems, and Other Small Wastewater Systems. Every local permit is issued under them.
Section 2 sets the chapter's purpose. It sets rules for building septic tanks and other small wastewater systems.
Wyoming Water Quality Rules and Regulations, Chapter 25 · checked 2026-09-23
Wyoming counties on this site
We have not published a Wyoming county page yet. A county earns a page when we hold facts unique to it. Until then this page is the answer for every county in the state.
Telling us your county is how we decide which one to build next.
Sources
State records only. Each figure above has a government source and a checked-on date. County figures live on the county pages.
Verify before you act. Septic rules are set locally and they change. Check anything here with your delegated small wastewater program before you spend money on it.