Who issues NPDES permits in Oregon?

Oregon Department of Environmental Quality issues and enforces NPDES permits for wastewater discharges in Oregon. Klarifi tracks 125 permits held by publicly owned treatment plants in the state.

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

52 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 4 are recorded as expired, out of 125 permits tracked. 68 are effective.

How many Oregon wastewater permits come up for renewal soon?

10 in 2026, 19 in 2027 and 10 in 2028. 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 Oregon

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

125 permits held by publicly owned wastewater treatment plants · issued by Oregon DEQ

Effective

Administratively continued

Expired

Total tracked

125

Oregon Department of Environmental Quality (Oregon DEQ) runs the NPDES program in Oregon under delegation from EPA Region 10, issuing and enforcing the discharge permits listed here. Klarifi tracks 125 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: 10 permits →2027: 19 permits →2028: 10 permits →

2029: 17 permits

2030: 11 permits

2031: 10 permits

Largest permit holders in Oregon

The 25 largest publicly owned wastewater treatment plants in Oregon 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)
Willow Lake WWTP	Salem	24.62	—	ORL026409	Effective	Dec 2030	2
Medford Rwrf	Central Point	14.5	20	OR0026263	Administratively continued	Jul 2026	1
Durham Waste Handling	Tigard	18.4	—	ORL028118	Effective	Dec 2030	6
Gresham WWTP	Portland	8.99	15	OR0026131	Administratively continued	Aug 2026	0
Albany-Millersburg WRF	Albany	4.59	8.7	OR0028801	Effective	Jan 2031	2
Tryon Creek WWTP	Lake Oswego	3.51	8.3	OR0026891	Effective	Apr 2029	2
Mcminnville WWTP	Mcminnville	2.73	5.6	OR0034002	Administratively continued	Dec 2008	2
Astoria STP	Astoria	1.75	5	OR0027561	Administratively continued	Oct 2016	14
Aurora Sewage Treatment Plant	Aurora	0.08	5	OR0043991	Effective	May 2027	11
Grants Pass STP	Grants Pass	4.48	4	OR0028843	Administratively continued	Sep 2014	16
Oak Lodge Water Reclamation Facility	Milwaukie	1.74	4	OR0026140	Effective	Mar 2027	3
Ontario STP	Ontario	—	3.06	OR0020621	Effective	Jan 2031	2
Lebanon STP	Lebanon	1.63	3	OR0020818	Effective	Oct 2030	54
Lincoln City STP	Lincoln City	1.44	3	OR0020478	Effective	Mar 2031	2
Hermiston WWTP	Hermiston	1.56	2.94	OR0020761	Effective	Jan 2028	0
Ashland WWTP	Ashland	1.71	2.3	OR0026255	Effective	Jan 2027	15
Seaside WWTP	Seaside	1.2	2.25	OR0020401	Effective	Jul 2029	27
Canby WWTP	Canby	0.99	2	OR0020214	Effective	Nov 2027	0
Dallas WWTP	Rickreall	1.42	2	OR0020737	Effective	Oct 2030	13
Hood River STP	Hood River	1.13	2	OR0020788	Effective	May 2031	46
Sweet Home STP	Sweet Home	0.7	1.38	OR0020346	Administratively continued	Mar 2010	27
Sutherlin WWTP	Oakland	0.59	1.3	OR0020842	Effective	Nov 2029	3
Lakeview STP	Lakeview	0.68	1.2	OR0041386	Effective	Jul 2031	143
Coquille City Shop And Waste Water Plant	Coquille	0.43	1	OR0026247	Effective	Jul 2029	56
Bandon STP	Bandon	0.26	1	OR0020206	Effective	Aug 2029	39

All 125 plants in Oregon →

NPDES permits in Oregon: 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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