Washington NPDES permit search
Status, expiry and violations for 146 municipal wastewater permits · issued by Ecology
In short
How do I look up an NPDES permit in Washington?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search Ecology’s PARIS database. EPA’s ECHO database shows the monitoring results and violations of every permit. The 804 industrial permits in Washington are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
45
Administratively continued
84
Expired
0
Plants with effluent violations, 3 years
77
Where to find official Washington NPDES records
Washington State Department of Ecology (Ecology) runs the NPDES program in Washington under authorization from EPA Region 10. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. EPA issues the permits of federal facilities and on tribal lands. Ecology website ↗
permits · permit documents · DMRs · inspections · violations · enforcement
Ecology’s Water Quality Permitting and Reporting Information System, covering NPDES and state waste discharge permits. Type a permit number, facility name or city under “Look up a permit”, open the facility summary and use “Permit Documents” for the files.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- NPDES permits follow EPA’s format, and PARIS also takes just the digits (11379 for WAR0011379). Ecology’s state-only waste discharge permits are numbered ST plus seven digits.
- Discharge monitoring reports
- Through WQWebDMR in Ecology’s own Water Quality Permitting Portal, not NetDMR.
- Violations and enforcement
- Ecology’s enforcement actions in PARIS ↗
Industrial and commercial NPDES permits in Washington
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 804 individual permits in force for industrial and commercial facilities in Washington (manufacturers, food processors, mines, power plants, landfills), 68 of them major dischargers, plus 12,281 facilities covered by a general permit, mostly for stormwater. 125 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 804 industrial permits in Washington
Search every industrial and commercial discharger in Washington by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Washington: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Washington wastewater plants
77 of the 146 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 85 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 31 formal cases naming Washington wastewater plants, 12 of them since fiscal year 2020, with $1.2 million in penalties assessed. Enforcement cases in Washington →
Permit renewals by year
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.
Largest permit holders in Washington
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Metro West Point | Seattle | 106.93 | — | WAL029181 | Effective | Dec 2030 | 275 |
| King County South WWTP | Renton | 74.4 | — | WAR002511 | Effective | Dec 2029 | 3 |
| Three Rivers Regional WWTP | Longview | 17.43 | 52 | WA0037788 | Administratively continued | Feb 2026 | 0 |
| Ellensburg WWTP | Ellensburg | 3.59 | 32 | WA0024341 | Administratively continued | Dec 2023 | 0 |
| Richland City Wastewater Lab | Richland | 5.91 | 22.8 | WA0020419 | Administratively continued | Sep 2021 | 0 |
| Chambers Creek WWTP | University Place | 22.49 | — | WAR000727 | Effective | Dec 2029 | 0 |
| Sunnyside STP | Sunnyside | 1.34 | 22.4 | WA0020991 | Administratively continued | Jan 2020 | 1 |
| Port Angeles WWTP | Port Angeles | 2.72 | 21.6 | WA0023973 | Administratively continued | Jan 2021 | 0 |
| Pullman City Muni SW | Pullman | 2.46 | 21.5 | WA0044652 | Administratively continued | May 2019 | 1 |
| Wenatchee Wastewater Treatment Plant | Wenatchee | 2.86 | 16.5 | WA0023949 | Administratively continued | Aug 2015 | 10 |
Washington NPDES permits: questions
NPDES permit search in other states
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 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · WWTP · Biosolids · all terms