Water quality in Simi Valley, California
Simi Valley is in Ventura County. 95 active public water systems serve the county; 37 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Ventura County
67 systems, nearest firstNon-community systems in Ventura County (27: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Foxfield Riding School |
120 | 0 | 0 | |
|
Ventura Farms |
100 | 0 | 0 | |
|
Lake Piru Park Uwcd |
960 | 0 | 0 | |
|
Santa Clara School |
39 | 0 | 0 | |
|
The Ranch at Live Oak |
82 | 1 | 1 | |
|
Glass House Camarillo Cultivation, LLC |
450 | 0 | 0 | |
|
Oxnard Pallet Company |
38 | 1 | 0 | |
|
Laguna Vista School/oceanview School Dis |
377 | 0 | 0 | |
|
GP Anacapa Foods, Llc. |
50 | 0 | 0 | |
|
Thomas Aquinas College |
382 | 1 | 0 | |
|
State Ready Mix, Inc. Ventura |
25 | 1 | 1 | |
|
Bouquet Multimedia |
100 | 0 | 0 | |
|
Nishi Quality Flowers, Inc. |
92 | 1 | 1 | |
|
Vulcan Materials Company Cal Mat |
30 | 1 | 1 | |
|
Rio Mesa High School/oxnard Uhs |
2,600 | 1 | 1 | |
|
Rio School Dist/rio del Valle School |
820 | 0 | 0 | |
|
Beedy Water Company, LLC |
35 | 0 | 0 | |
|
Vineyard Mutual Water Company/industrial |
259 | 0 | 0 | |
|
Rio School Dist/ Rio Real School |
550 | 0 | 0 | |
|
Pyramid Flowers |
30 | 1 | 0 | |
|
Dennison Park |
102 | 1 | 0 | |
|
Smith Forks Water System |
3,000 | 1 | 0 | |
|
Usfs Wheeler Gorge Campground |
500 | 0 | 0 | |
|
Usfs Chuchupate Ranger Station |
26 | 1 | 1 | |
|
Camp Scheideck |
33 | 1 | 1 | |
|
Channel Islands National Park |
30 | 0 | 0 | |
|
Santa Clara Resources |
30 | 1 | 0 |
About this data
Water systems are matched to Ventura County, nearest to Simi Valley first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.