Wyoming wastewater permits expiring in 2027
8 NPDES permits · 4 MGD combined average flow
8 publicly owned wastewater treatment plants in Wyoming hold NPDES permits that expire during 2027, issued by Wyoming Department of Environmental Quality. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| Chief Washakie Recreation Comp | Fort Washakie | 0.1 | WYG589101 | Mar 2027 | Aerated lagoons, Uncovered lagoons | 84 |
| Great Plains Hall Wastewater | Fort Washakie | — | WYG589102 | Mar 2027 | Uncovered lagoons | — |
| Worland Wastewater Lagoon | Worland | 0.71 | WY0020176 | Apr 2027 | — | 0 |
| Greybull Wastewater Lagoon | Greybull | — | WY0020583 | Jun 2027 | Uncovered lagoons | 286 |
| Meeteetse Wastewater Lagoons | Meeteetse | — | WY0020044 | Jun 2027 | Uncovered lagoons | 0 |
| Gillette WWTF | Gillette | 2.92 | WY0020125 | Jul 2027 | Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons | 7 |
| Lyman Wastewater Lagoon | Lyman | 0.4 | WY0020117 | Sep 2027 | Aerated lagoons | 47 |
| Town Of Bear River Wastewater Lagoons | Bear River | — | WY0031712 | Sep 2027 | Aerated lagoons | 7 |
Wyoming permit renewals in 2027: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.