Clean Water Act discharge permit · NPDES WA0031682
SEATTLE CSO, Seattle, WA: NPDES WA0031682 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 4Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SEATTLE CSO, held by CITY OF SEATTLE PUBLIC UTILITIES, holds NPDES permit WA0031682. EPA’s file records it issued March 30, 2016 and expiring April 30, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SEATTLE CSO |
|---|---|
| Permittee as filed | CITY OF SEATTLE PUBLIC UTILITIES |
| NPDES ID | WA0031682 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 30, 2016 |
| Expiration date | April 30, 2021 |
| Issuing agency | State |
| Address | Seattle, WA 98104 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lake Washington-Sammamish River (HUC 171100120400) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 4Pollutants on file
- 4Under a numeric limit
- 4With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Duration of discharge | 86 | 8,896 | 0 | ||
| Rainfall duration | 86 | 8,661 | 0 | ||
| Rainfall | 86 | 83 | 0 | ||
| Volume, total | 86 | 83 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES WA0031682.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 4, 2018 | WW SSO - Discharge to Waters | ST6 |
| December 19, 2017 | WW SSO - Discharge to Waters | ST6 |
| September 11, 2017 | WW SSO - Discharge to Waters | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID WA0031682 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.