COUNTY WATER-SYSTEM LEDGER
Sonoma, California
EPA’s September 2026 export lists 16 active community water systems serving Sonoma, California, with 2 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Sonoma, California
EPA associates 16 covered systems with Sonoma, California; their reported population-served values total 412,436 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Santa Rosa, City OfCA4910009 | 175,396 | Ground water | No current violation flagged |
| Petaluma, City OfCA4910006 | 60,781 | Ground water | No current violation flagged |
| Rohnert Park, City OfCA4910014 | 43,821 | Ground water | No current violation flagged |
| Windsor, Town OfCA4910017 | 25,561 | Ground water | No current violation flagged |
| Valley Of The Moon Water DistrictCA4910013 | 23,107 | Ground water | No current violation flagged |
| Sonoma, City OfCA4910012 | 11,725 | Ground water | Current monitoring/reporting flag |
| Sonoma State UniversityCA4910027 | 10,986 | Ground water | No current violation flagged |
| Healdsburg, City OfCA4910005 | 10,985 | Groundwater under influence of surface water | No current violation flagged |
| Cloverdale, City OfCA4910002 | 10,398 | Groundwater under influence of surface water | Current monitoring/reporting flag |
| California-American Larkfield (Puc)CA4910023 | 7,913 | Ground water | No current violation flagged |
| Sebastopol, City OfCA4910011 | 7,522 | Ground water | No current violation flagged |
| Cotati, City OfCA4910016 | 7,303 | Ground water | No current violation flagged |
| Sweetwater Springs Cwd - GuernevilleCA4910004 | 6,000 | Ground water | No current violation flagged |
| Russian River County Water DistrictCA4910008 | 4,150 | Ground water | No current violation flagged |
| Forestville Water DistrictCA4910019 | 3,788 | Ground water purchased | No current violation flagged |
| Sweetwater Springs Cwd - Monte RioCA4910028 | 3,000 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Sonoma, California
EPA classifies 16 systems serving Sonoma, California across 3 primary-source categories; Ground water is the largest category with 13 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.