City Council Agenda Report
TO: Mayor Clauzel and Members of the City Council
FROM: Fernando Ulloa, City Manager
BY: Mike Willett, Public Works Director
MEETING DATE: June 17, 2025
ITEM NO: 6.8
SUBJECT: Approve Resolution No. 2025-39 Approving the 2025 update of the City’s Sewer System Management Plan (SSMP), as required by the State Water Resources Control Board (SWRCB).
RECOMMENDATION
Motion to Approve Resolution No. 2025-39 Approving the 2025 update of the City’s Sewer System Management Plan (SSMP), as required by the State Water Resources Control Board (SWRCB).
BACKGROUND
The State Water Resources Control Board (SWRCB) adopted General Waste Discharge Requirements (WDRs) for sanitary sewer systems under Order No. 2006-0003-DWQ, later updated by Order 2022-0103-DWQ. These orders require public agencies operating sanitary sewer systems longer than one mile to develop, implement, and maintain a Sewer System Management Plan (SSMP) to prevent and mitigate sanitary sewer overflows (SSOs).
The City of Patterson adopted its original SSMP on April 21, 2009 (Resolution No. 2009-24). In compliance with the six-year update cycle established under the new 2022 General Order, the City has completed the 2025 SSMP update, which reflects operational improvements, current staffing, asset inventory, and procedural updates.
The 2025 SSMP update was developed by Public Works staff and it incorporates data from internal audits (2022, 2024) and aligns with current regulatory requirements.
ANALYSIS
The 2025 SSMP comprehensively addresses 11 key program elements required by the SWRCB.
These include:
1. Goals
2. Organization
3. Legal Authority
4. Operation and Maintenance Program
5. Design and Performance Provisions
6. Spill Emergency Response Plan
7. Sewer Pipe Blockage Control Program
8. System Evaluation and Capacity Assurance and Capital Improvements
9. Monitoring, Measurement, and Program Modifications
10. Internal Audits
11. Communication Program
Key updates in the 2025 SSMP include:
· Integration of recent internal audits (2022 and 2024) · Confirmation of zero SSOs reported over the past four years · Implementation of the MobileMMS asset management system · Enhanced preventive maintenance planning and reporting · Clarified staff responsibilities and chain of communication for SSO response The City manages approximately 63 miles of sanitary sewer lines, three lift stations, and 7,133 service connections. The revised SSMP continues to support the City's compliance with CIWQS electronic reporting and aligns with both SWRCB orders.
The Public Works Department’s Collections Division has achieved a milestone of 4 consecutive years with no sanitary sewer overflow. This is due to the service level and hard work that the Collections Division has provided. Staff looks forward to reporting the next future milestone.
FISCAL IMPACT
None at this time. The SSMP update was completed using internal staffing and resources.