COUNTY WATER-SYSTEM LEDGER
Ventura, California
EPA’s September 2026 export lists 22 active community water systems serving Ventura, California, with 0 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 Ventura, California
EPA associates 22 covered systems with Ventura, California; their reported population-served values total 842,868 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 |
|---|---|---|---|
| Oxnard Water DeptCA5610007 | 200,232 | Surface water purchased | No current violation flagged |
| Ventura Water DepartmentCA5610017 | 113,500 | Surface water | No current violation flagged |
| Ventura Wwd No. 8 - Simi ValleyCA5610023 | 94,738 | Surface water purchased | No current violation flagged |
| Cal American Water CoCA5610040 | 66,809 | Surface water purchased | No current violation flagged |
| City Of Thousand Oaks Water DepartmentCA5610020 | 53,157 | Surface water purchased | No current violation flagged |
| Camarillo Water DeptCA5610019 | 46,824 | Surface water purchased | No current violation flagged |
| Golden State Water Company - Simi ValleyCA5610059 | 45,128 | Surface water purchased | No current violation flagged |
| Ventura Cwwd No. 1 - MoorparkCA5610018 | 35,514 | Surface water purchased | No current violation flagged |
| Camrosa Water DistrictCA5610063 | 32,700 | Surface water purchased | No current violation flagged |
| City Of Santa PaulaCA5610011 | 31,018 | Ground water | No current violation flagged |
| Port Hueneme City Water DeptCA5610009 | 21,407 | Surface water purchased | No current violation flagged |
| California Water Service Co - WestlakeCA5610016 | 19,533 | Surface water purchased | No current violation flagged |
| Fillmore Water DeptCA5610002 | 16,419 | Ground water | No current violation flagged |
| Triunfo Water & Sanitation DistrictCA5610043 | 13,898 | Surface water purchased | No current violation flagged |
| Casitas Municipal Water DistCA5610024 | 11,005 | Surface water | No current violation flagged |
| Naval Base Ventura County, Port HuenemeCA5610701 | 8,625 | Surface water purchased | No current violation flagged |
| Ojai Water SystemCA5610014 | 6,801 | Surface water purchased | No current violation flagged |
| Ventura River Water DistrictCA5610022 | 6,100 | Surface water purchased | No current violation flagged |
| Naval Base Ventura County, Point MuguCA5610700 | 5,700 | Surface water purchased | No current violation flagged |
| Pleasant Valley Mutual Water CoCA5610008 | 5,000 | Surface water purchased | No current violation flagged |
| Channel Islands Beach CsdCA5610039 | 4,560 | Surface water purchased | No current violation flagged |
| Meiners Oaks CwdCA5610005 | 4,200 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Ventura, California
EPA classifies 22 systems serving Ventura, California across 3 primary-source categories; Surface water purchased is the largest category with 18 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.