How many wastewater permits expire in Colorado in 2026?

7 NPDES permits held by publicly owned wastewater treatment plants in Colorado expire in 2026, covering a combined average flow of 2 MGD. The busiest month is Jun 2026 with 3 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 Colorado in 2026?

Vail WWTP in Vail, treating about 1.36 MGD under permit CO0021369, expiring Feb 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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Colorado wastewater permits expiring in 2026

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

7 NPDES permits · 2 MGD combined average flow

7 publicly owned wastewater treatment plants in Colorado hold NPDES permits that expire during 2026, issued by Colorado Department of Public Health and Environment. 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.

All Colorado NPDES permits →

Publicly owned wastewater treatment plants in Colorado 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)
Las Animas WWTP	Las Animas	0.72	CO0040690	Jan 2026	76
Vail WWTP	Vail	1.36	CO0021369	Feb 2026	6
Upper Eagle Regional Water Authority Plant	Avon	—	CO0024431	Feb 2026	18
Hot Sulphur Spr. WWTP	Hot Sulphur Springs	0.11	COG590084	Mar 2026	1
Steamboat Lake State Park	Clark	0.03	COX634078	Jun 2026	20
Fort Garland Water & San Dist	Fort Garland	0.02	COX634075	Jun 2026	71
Peyton High School	Peyton	0.0021	COX634032	Jun 2026	0

Colorado 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 · Filter press · FOG · 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: Colorado wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/colorado/permits-expiring/2026

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