How many wastewater permits expire in Wyoming in 2026?

6 NPDES permits held by publicly owned wastewater treatment plants in Wyoming expire in 2026, covering a combined average flow of 3 MGD. The busiest month is Apr 2026 with 2 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in Wyoming in 2026?

Lander Wastewater Lagoon in Lander, treating about 1.11 MGD under permit WY0020389, expiring Apr 2026.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, permit and compliance data. Treatment technology and verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free account.

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Wyoming wastewater permits expiring in 2026

Name: Wyoming NPDES permits expiring in 2026
Creator: Klarifi
License: https://klarifi.io/terms-of-service

6 NPDES permits · 3 MGD combined average flow

6 publicly owned wastewater treatment plants in Wyoming hold NPDES permits that expire during 2026, 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.

Other years:

2027 (8)2028 (6)All Wyoming NPDES permits →

Publicly owned wastewater treatment plants in Wyoming with NPDES permits expiring in 2026, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Lander Wastewater Lagoon	Lander	1.11	WY0020389	Apr 2026	47
City Of Rawlins Wastewater Treatment Facility	Rawlins	0.85	WY0020427	Apr 2026	6
Ten Sleep Wastewater Lagoons	Ten Sleep	0.15	WYG740962	Jul 2026	14
Buffalo WWTP	Buffalo	0.75	WY0021024	Oct 2026	0
Basin Wastewater Lagoon	Basin	0.58	WY0020028	Dec 2026	35
Encampment Wastewater Lagoon	Encampment	0.04	WY0020591	Dec 2026	10

Wyoming permit renewals in 2026: 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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Equalization tank · Centrate · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “NPDES permits expiring in 2026: Wyoming wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/wyoming/permits-expiring/2026

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