Who issues NPDES permits in Colorado?

Colorado Department of Public Health and Environment issues and enforces NPDES permits for wastewater discharges in Colorado. Klarifi tracks 137 permits held by publicly owned treatment plants in the state.

How many NPDES permits in Colorado are expired or administratively continued?

115 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 2 are recorded as expired, out of 137 permits tracked. 13 are effective.

How many Colorado wastewater permits come up for renewal soon?

7 in 2026, 4 in 2028 and 8 in 2029. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in Colorado

Name: NPDES permits held by wastewater treatment plants in Colorado
Creator: Klarifi
License: https://klarifi.io/terms-of-service

137 permits held by publicly owned wastewater treatment plants · issued by CDPHE

Effective

Administratively continued

115

Expired

Total tracked

137

Colorado Department of Public Health and Environment (CDPHE) runs the NPDES program in Colorado under delegation from EPA Region 8, issuing and enforcing the discharge permits listed here. Klarifi tracks 137 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

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.

Permit renewals by year

2026: 7 permits →

2028: 4 permits

2029: 8 permits

2030: 1 permits

2031: 3 permits

Largest permit holders in Colorado

The 25 largest publicly owned wastewater treatment plants in Colorado by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
Jd Phillips Water Reclamation Facility	Colorado Springs	—	20	CO0046850	Administratively continued	May 2020	9
Persigo Wastewater Treatment Plant	Grand Junction	11.4	12.5	CO0040053	Administratively continued	Dec 2022	1
Greeley WWTP	Greeley	9.4	—	COL040258	Effective	Dec 2030	13
Rainbow Park WWTP	Florence	4.7	8.5	CO0039748	Administratively continued	Feb 2020	0
Big Dry Creek WWTP	Westminster	6.9	—	COR901608	Effective	Jun 2029	388
Mulberry WWTP	Fort Collins	—	6	CO0026425	Administratively continued	Apr 2021	1
St Vrain Sanitation District	City Of Longmont	3.55	6	CO0041700	Administratively continued	Nov 2017	0
Parker Water + Sanitation District - North Water Reclamation Facility	Parker	5.1	—	COG072642	Terminated	Aug 2018	75
Sand Creek Water Reuse Facilty	Aurora	—	5	CO0026611	Terminated	Apr 2029	0
Steamboat Springs WWTP	Steamboat Springs	2.22	5	CO0020834	Administratively continued	Dec 2021	27
Breckenridge Sanitation District	Breckenridge	1.96	4.99	CO0021539	Administratively continued	Aug 2020	0
Golden City Of	Jefferson County	1.73	4.8	CO0042170	Administratively continued	Sep 2017	0
South Ft. Collins Sanit. Dist.	Fort Collins	4.23	4.5	CO0020737	Administratively continued	Jan 2018	1
Upper Eagle Regional Water Authority Plant	Avon	—	4.3	CO0024431	Administratively continued	Feb 2026	18
Northglenn WWTP	Brighton	3.65	4.2	CO0036757	Administratively continued	Dec 2024	10
Arapahoe County Water And Waste Water Authority	Englewood	2.53	3.6	COE015000	Administratively continued	Aug 2020	0
City Of Louisville	Louisville	2.68	3.4	CO0023078	Administratively continued	Sep 2016	3
Snowmass Water And San Dist	Snowmass Village	—	3.2	CO0023086	Administratively continued	Apr 2020	4
Monte Vista City Of	Monte Vista	0.32	3.09	CO0023132	Administratively continued	Feb 2020	74
Lafayette WWTF	Lafayette	3.03	—	COR900828	Effective	Jun 2029	0
Aspen Consolidated Sanitation District	Aspen	1.4	3	CO0026387	Effective	Apr 2031	10
Hill-N-Park STP	Greeley	1.79	2.88	CO0047287	Administratively continued	Dec 2023	5
Town Of Windsor Sewarage Treatment Plant	Windsor	2.85	2.8	CO0020320	Administratively continued	May 2020	0
Fort Lupton WWTF	Fort Lupton	3.86	2.75	CO0021440	Administratively continued	Jun 2023	2
City Of Salida WWTP	Salida	0.78	2.7	CO0040339	Administratively continued	Nov 2024	0

All 137 plants in Colorado →

NPDES permits in Colorado: 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.

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