Facility Summary

SEATTLE CSO

Facility Name:
SEATTLE CSO
Address:
City:
SEATTLE
County:
King


Permits as of 11/14/2025 - Bold Records Indicate Active Permits
Click the version number to view the permit documents associated with the permit.
Permit NumberTypeVersionEffective DateExpiration Date
WA0024503Municipal NPDES IP 1 4/18/19756/30/1977
WA0031682Municipal NPDES IP 1 4/30/19986/30/2002
WA0031682Municipal NPDES IP 2 12/1/200511/30/2010
WA0031682Municipal NPDES IP 3 12/1/201011/30/2015
WA0031682Municipal NPDES IP 4 5/1/20164/30/2021
WA0031682Municipal NPDES IP 5 12/1/202511/30/2030
Permit NumberViolations/TriggersInspectionsEnforcements
WA0024503
0
0
1
WA0031682
43
3
50
These counts represent "all time". Click to view the details of these values. Links will show only active permits by default.
-Feature Active -Feature Inactive -Facility -Facility
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Most Recent Interactions (Enforcements, Inspections and Submittals)
Data TypeAction DateDescription
Submittal10/29/2025Permit
Submittal10/29/2025Permit
Submittal10/7/2025Permit
Enforcement10/1/2025Civil Penalty
Submittal8/26/2025Permit
Submittal7/15/2025Permit
Enforcement5/22/2025Admin Order Amendment
Enforcement12/12/2024Civil Penalty
Enforcement11/28/2023Civil Penalty
Enforcement1/5/2023Civil Penalty
Inspection9/24/2003Operation And Maintenance Inspection
Inspection9/17/2003Operation And Maintenance Inspection
Inspection5/12/2003Compliance Evaluation (Non-Sampling)
Facility Documents
Click on the document name to download and open the document.
Permit NumberPermit VersionDocument TypePermit StatusIssued DatePermit TypeDocument NamePublic Notice DateInfo
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/29/2025Reporting Permit Violations - Written Report Received: 10/29/2025
WA00316825Permit DocumentsDraft10/29/2025Municipal NPDES IP  Permit Issuance
WA00316825Permit DocumentsDraft10/29/2025Municipal NPDES IP  Permit Issuance
WA00316825Permit DocumentsDraft10/29/2025Municipal NPDES IP  Permit Issuance
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/7/2025Reporting Permit Violations - Written Report Received: 10/07/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/7/2025Reporting Permit Violations - Written Report Received: 10/07/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 10/7/2025Reporting Permit Violations - Written Report Received: 10/07/2025
WA00316824Enforcement DocumentsActive3/30/2016Municipal NPDES IP 10/1/2025 
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 8/26/2025Reporting Permit Violations - Written Report Received: 08/26/2025
WA00316824Permit SubmittalsActive3/30/2016Municipal NPDES IP 8/26/2025Reporting Permit Violations - Written Report Received: 08/26/2025
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