Watershed Sanitary Survey

The Safe Drinking Water Act Surface Water Treatment Rule and the State of California Title 22, Code of Regulations, requires all domestic water suppliers treating surface water to conduct a Watershed Sanitary Survey of their watersheds and to update the survey every 5 years. The purpose of the survey is to evaluate the potential contaminant sources within the watershed that may impact drinking water quality. Following is the final 2020 Watershed Sanitary Survey.

Watershed Sanitary Survey – Final (PDF)

• Appendix A (PDF) – SFPUC WEIP 2015-2016 Annual Report
• Appendix B (PDF) – NPDES and WDR Permits
• Appendix C (PDF) – Local Agency Management Programs for Tuolumne and Stanislaus Counties
• Appendix D (PDF) – Basin Plan Objectives
• Appendix E (PDF) – DPRA Rules and Regulations
• Appendix F (PDF) – Modesto Irrigation District Domestic Water Supply Permit
• Appendix F (PDF) – Modesto Reservoir Management Plan
• Appendix G (PDF) – Invasive Species Public Education Materials (Part 1)
• Appendix G (PDF) – Invasive Species Public Education Materials (Part 2)
• Appendix H (PDF) – Post Rim Fire Monitoring Data Collected by MID
• Appendix I (PDF) – Summary of Federal and California State Water Quality Regulations
• Appendix J (PDF) – Excerpts from Stanislaus Regional Water Authority Surface Water Supply Project
• Appendix K (PDF) – Modesto Regional WTP – Title 22 Constituents
• Appendix L (PDF) – Proposed Phase 2 Extended Monitoring Program for SRWA
• Appendix M (PDF) – Photos
• Appendix N (PDF) – SRWA/MID 2020 Watershed Sanitary Survey – DDW Report Comments and Responses