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Penngrove Sanitation Zone

About the Zone 

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  • Service area: 475 acres

  • Treatment level: None (see Discharge below)

  • Design capacity: Not applicable (collection system only)

  • Discharge: The collected sewage from the Penngrove Sanitation Zone is routed through the Penngrove Sanitation Zone's lift station to the City of Petaluma's system for treatment.

  • Board of Directors: Sonoma Water's Board of Directors act as the Zone's Board.

Newsletters and Proposition 218 Notices

Spring 2026 Newsletter | Spring 2026 Newsletter - SPANISH

Spring 2025 Newsletter | Spring 2025 Newsletter - SPANISH

See past Newsletters here

Budget Information

View Budget Archive

District Programs/Projects

Sanitary Sewer Capacity Evaluation

Sonoma Water completed a hydraulic capacity evaluation of the Penngrove Sanitation Zone (PSZ) sewer collection system to assess the system’s ability to convey peak wet weather flows and comply with the State Water Resources Control Board’s 2022 Waste Discharge Requirements for sanitary sewer systems. The study assessed both existing conditions and projected future development conditions within the Penngrove service area. The Sanitary Sewer Capacity Evaluation study can be found here.

Sewer System Management Plan

The goal of the Penngrove Sanitation Zone Sewer System Management Plan (SSMP) is to provide a plan and schedule to properly manage, operate, and maintain all parts of the sanitary sewer system to prevent SSOs (Sanitary Sewer Overflow) and mitigate any SSOs that do occur. This will help reduce and prevent SSOs, as well as mitigate any SSOs that do occur.

Ongoing Programs

Water Efficiency Rebate Program - Rebates for high-efficiency toilets, clothes washers and more.

Contact Information