About the Penngrove Sewage Crisis:

  • August 6, 2026 email from Supervisor Rabbitt, including links to Executive Summary and FAQ on Penngrove Sanitation Zone Capacity from Sonoma Water

  • July 2, 2026 letter sent to Board of Supervisors

  • Penngrove Cares summary of sewage crisis documentation

  • Flow chart (no pun intended) illustrating how each Penngrove sanitary sewer overflow (SSO) is currently handled

  • Full documentation based on Penngrove Cares’ Freedom of Information Act (FOIA) request

  • Sanitary Sewer Capacity Evaluation, from Sonoma Water:
    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.

From November 2002:
Penngrove Sewer Capacity Study

The first several pages of this study give a status report on the Penngrove Sewer System in 2002.

The system was already at capacity in 2002, and neither the system nor the report have been updated since.