How many wastewater permits expire in Wyoming in 2027?

8 NPDES permits held by publicly owned wastewater treatment plants in Wyoming expire in 2027, covering a combined average flow of 4 MGD. The busiest month is Mar 2027 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 2027?

Gillette WWTF in Gillette, treating about 2.88 MGD under permit WY0020125, expiring Jul 2027.

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 2027

Name: Wyoming NPDES permits expiring in 2027
Creator: Klarifi
License: https://klarifi.io/terms-of-service

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.

Other years:

2026 (6)2028 (6)All Wyoming NPDES permits →

Publicly owned wastewater treatment plants in Wyoming with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Chief Washakie Recreation Comp	Fort Washakie	0.16	WYG589101	Mar 2027	77
Great Plains Hall Wastewater	Fort Washakie	—	WYG589102	Mar 2027	—
Worland Wastewater Lagoon	Worland	0.76	WY0020176	Apr 2027	0
Greybull Wastewater Lagoon	Greybull	0.07	WY0020583	Jun 2027	284
Meeteetse Wastewater Lagoons	Meeteetse	—	WY0020044	Jun 2027	0
Gillette WWTF	Gillette	2.88	WY0020125	Jul 2027	7
Lyman Wastewater Lagoon	Lyman	0.2	WY0020117	Sep 2027	47
Town Of Bear River Wastewater Lagoons	Bear River	0.17	WY0031712	Sep 2027	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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Centrate · Ozonation · 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 2027: Wyoming wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/wyoming/permits-expiring/2027

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