Tap Truth EPA drinking water records, in plain English

County drinking water records

Ventura County, CA drinking water systems

69 community water systems serve Ventura County, CA, reporting 872,422 people served in all. A system that also serves other counties counts all of its customers here.

18 of them (26%) had at least one health-based violation in the last 10 years. 10 systems still have one unresolved.

27 rely mainly on groundwater and 42 on surface water, counting water bought from other systems.

65 systems filed a lead service line inventory listing 0 lead lines, 0 galvanized lines that must be replaced and 7,005 lines of unknown material.

Community water systems
69
People served, sum of each system's own figure
872,422
Systems with a health-based violation, last 10 years
18
Systems with one unresolved
10
Lead service lines in inventories
0

Water systems serving Ventura County

69 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Oxnard Water Dept Oxnard, Port Hueneme and 1 more 200,232 Purchased surface water 0 0 0
Ventura Water Department San Buenaventura (Ventura) and Saticoy 113,500 Surface water 1 0 0
Ventura WWD No. 8 - Simi Valley Simi Valley and Santa Susana 94,738 Purchased surface water 0 0 0
Cal American Water Co Thousand Oaks and Casa Conejo 66,809 Purchased surface water 0 0 0
City of Thousand Oaks Water Department Thousand Oaks 53,157 Purchased surface water 0 0 0
Camarillo Water Dept Camarillo 46,824 Purchased surface water 0 0 0
Golden State Water Company - Simi Valley Simi Valley 45,128 Purchased surface water 0 0 0
Ventura CWWD No. 1 - Moorpark Moorpark and land outside it 35,514 Purchased surface water 0 0 0
Camrosa Water District Camarillo, Santa Rosa Valley and 1 more 32,700 Purchased surface water 0 0 0
City of Santa Paula Santa Paula and land outside it 31,018 Groundwater 0 0 0
Port Hueneme City Water Dept Port Hueneme 21,407 Purchased surface water 0 0 0
California Water Service Co - Westlake Thousand Oaks and Oak Park 19,533 Purchased surface water 0 0 0
Fillmore Water Dept Fillmore 16,419 Groundwater 0 0 0
Triunfo Water & Sanitation District Oak Park 13,898 Purchased surface water 0 0 0
Casitas Municipal Water Dist San Buenaventura (Ventura), Mira Monte and 3 more and land outside them 11,005 Surface water 1 0 0
Naval Base Ventura County, Port Hueneme Port Hueneme and land outside it 8,625 Purchased surface water 0 0 0
Ojai Water System Ojai and Meiners Oaks 6,801 Purchased surface water 0 0 0
Ventura River Water District Oak View, Mira Monte and 1 more 6,100 Purchased surface water 3 0 0
Naval Base Ventura County, Point Mugu Outside cities and towns 5,700 Purchased surface water 1 0 0
Pleasant Valley Mutual Water Co Camarillo and land outside it 5,000 Purchased surface water 0 0 0
Channel Islands Beach CSD Channel Islands Beach 4,560 Purchased surface water 0 0 0
Meiners Oaks CWD Meiners Oaks and Mira Monte 4,200 Purchased surface water 0 0 0
Crestview Mutual Water Co Outside cities and towns 2,079 Purchased surface water 0 0 0
Cal American WC - Las Posas Estates Outside cities and towns 2,039 Purchased surface water 0 0 0
Cal American Water Company - Piru Piru 2,003 Groundwater 0 0 0
Ventura CWWD No. 17 - Bell Canyon Bell Canyon and land outside it 1,946 Purchased surface water 0 0 0
Vineyard Avenue Acres MWC El Rio 1,820 Groundwater 2 2 0
Ventura CWWD No. 38 - Lake Sherwood Lake Sherwood 1,759 Purchased surface water 0 0 0
Cal American WC - Rio Plaza El Rio 1,709 Groundwater 0 0 0
Ventura CWWD No. 19 - Somis Somis and land outside it 1,429 Purchased surface water 0 0 0
Garden Acres Mutual Water Co Outside cities and towns 1,335 Groundwater 0 0 0
Vineyard Ave Estates MWC El Rio 1,200 Purchased surface water 1 2 0
Limoneira Ranch #1 Outside cities and towns 1,187 Purchased groundwater 0 0 0
Dempsey Road Mutual Water Co Oxnard 990 Purchased surface water 0 0 0
Rio Manor Mutual Water Co Oxnard 983 Groundwater 0 0 0
Nyeland Acres Mutual Water Co Outside cities and towns 975 Groundwater 0 0 0
Senior Canyon Mutual Water Co Outside cities and towns 800 Surface water 2 0 0
Lake of the Woods MWC Lake of the Woods 779 Groundwater 10 0 0
Cal American - Yerba Buena Outside cities and towns 690 Groundwater 0 0 0
Brandeis Bardin Institute Outside cities and towns 665 Purchased surface water 0 0 0
Rancho Sespe Workers Imp Assoc Piru 600 Groundwater 0 0 0
Cloverdale Mutual Water Co. El Rio 455 Groundwater 0 0 0
Strickland Mutual Water Company El Rio 429 Groundwater 0 0 0
Saviers Road Mutual Water Co Oxnard 368 Purchased surface water 0 0 0
Fillmore Irrigation Co Outside cities and towns 353 Groundwater 0 0 0
Sisar Mutual Water Co Outside cities and towns 340 Groundwater 0 0 0
Siete Robles Mutual Water Co Outside cities and towns 323 Purchased surface water 1 2 No inventory
U.S.N., San Nicolas Island Outside cities and towns 254 Groundwater under direct influence 0 0 0
Casitas Mutual Water Company Outside cities and towns 238 Purchased surface water 1 3 0
Cypress Mutual Water Co Inc Oxnard 224 Purchased surface water 0 0 0
Del Norte Mutual Water Co. Camarillo and Santa Paula 215 Groundwater 4 2 No inventory
Saticoy Country Club-City of Ventura Outside cities and towns 196 Groundwater 1 0 0
Siesta Mobile Home Park Outside cities and towns 160 Groundwater 1 2 0
Navalair Mobile Home Park Outside cities and towns 160 Groundwater 1 2 0
Elkins Ranch Outside cities and towns 150 Surface water 2 2 No inventory
Middle Road Mutual Water Co Outside cities and towns 134 Purchased groundwater 0 0 0
Solano Verde Mutual Water Co Outside cities and towns 100 Purchased surface water 0 0 0
Alturas Fillmore MHP Outside cities and towns 99 Groundwater 0 0 0
Tico Mutual Water Co Mira Monte 72 Purchased surface water 0 0 0
Community Mutual Water Co Outside cities and towns 65 Groundwater 0 0 0
South Mountain Mutual Water Co Outside cities and towns 58 Groundwater 0 0 0
Esterina Properties Outside cities and towns 50 Groundwater 1 2 No inventory
San Cayetano Mutual Water Co Outside cities and towns 43 Groundwater 0 0 0
Krotona Institute Ojai 30 Groundwater 1 2 0
Rincon Water & Road Works Outside cities and towns 25 Purchased surface water 6 0 0
Waters Road Domestic Users Group Outside cities and towns 25 Purchased surface water 0 0 0
United Wtr Cons Dist Oxnard, San Buenaventura (Ventura) and 7 more and land outside them Not reported Groundwater under direct influence 0 0 0
Calleguas Municipal Water Dist Thousand Oaks, Simi Valley and 9 more and land outside them Not reported Surface water 0 0 0
Port Hueneme Water Agency Port Hueneme and Channel Islands Beach and land outside them Not reported Purchased surface water 0 0 0

Cities and towns in Ventura County

24 places

Back to California

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations