Facility Summary

SEATTLE CSO

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


Permits as of 7/13/2025 - Bold Records Indicate Active Permits
Click the version number to view the permit documents associated with the permit.
Permit NumberTypeVersionEffective DateExpiration Date
WA0031682Municipal NPDES IP 5   
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
Permit NumberViolations/TriggersInspectionsEnforcements
WA0024503
0
0
1
WA0031682
43
3
48
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
Enforcement12/12/2024Civil Penalty
Enforcement11/28/2023Civil Penalty
Enforcement1/5/2023Civil Penalty
Enforcement12/16/2020Civil Penalty
Enforcement5/6/2019Civil Penalty
Inspection9/24/2003Operation And Maintenance Inspection
Inspection9/17/2003Operation And Maintenance Inspection
Inspection5/12/2003Compliance Evaluation (Non-Sampling)
Submittal6/9/2025Permit
Submittal5/28/2025Permit
Submittal4/15/2025Permit
Submittal3/27/2025Permit
Submittal3/27/2025Permit
Facility Documents
Click on the document name to download and open the document.
Permit NumberPermit VersionDocument TypePermit StatusIssued DatePermit TypeDocument NamePublic Notice DateInfo
 5Permit DocumentsDraft Municipal NPDES IP  Application
 5Permit DocumentsDraft Municipal NPDES IP  Application
 5Permit DocumentsDraft Municipal NPDES IP  Application
 5Permit DocumentsDraft Municipal NPDES IP  Application
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP  Other Received: 05/16/2022
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP  Other Received: 05/16/2022
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 6/9/2025Engineering Report Received: 06/09/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 6/9/2025Engineering Report Received: 06/09/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 6/9/2025Engineering Report Received: 06/09/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 6/9/2025Engineering Report Received: 06/09/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 5/28/2025Combined Sewer Overflow Report Received: 05/28/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 5/28/2025Combined Sewer Overflow Report Received: 05/28/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 5/28/2025Combined Sewer Overflow Report Received: 05/28/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 5/28/2025Combined Sewer Overflow Report Received: 05/28/2025
 4Permit SubmittalsActive3/30/2016Municipal NPDES IP 5/28/2025Combined Sewer Overflow Report Received: 05/28/2025
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