Ventura County, California Water Systems

Ventura County, California

106 community water systems on record — 68 active, 38 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.

Community water systems in Ventura County, California

System name	City	Population served	Status
ALTURAS FILLMORE MHP	IRVINE	99	Active
ARROYO MOBILE HOME PARK	VENTURA	88	Inactive
BEEF BARN	OXNARD	25	Inactive
BRANDEIS BARDIN INSTITUTE	SIMI VALLEY	665	Active
BROWNSTONE WATER CO	FILLMORE	26	Inactive
CABRILLO VILLAGE	—	90	Inactive
CAL AMERICAN - YERBA BUENA	ROSEMEAD	690	Active
CAL AMERICAN WATER CO	ROSEMEAD	66,809	Active
CAL AMERICAN WATER COMPANY - PIRU	ROSEMEAD	2,003	Active
CAL AMERICAN WC - LAS POSAS ESTATES	ROSEMEAD	2,039	Active
CAL AMERICAN WC - RIO PLAZA	ROSEMEAD	1,709	Active
CALIFORNIA WATER SERVICE CO - WESTLAKE	SAN JOSE	19,533	Active
CALLEGUAS MUNICIPAL WATER DIST	THOUSAND OAKS	0	Active
CAMARILLO STATE HOSPITAL	CAMARILLO	6,000	Inactive
CAMARILLO STATE HOSPITAL	CAMARILLO	6,000	Inactive
CAMARILLO WATER DEPT	CAMARILLO	46,824	Active
CAMROSA WATER DISTRICT	CAMARILLO	32,700	Active
CASITAS MUNICIPAL WATER DIST	OAK VIEW	11,005	Active
CASITAS MUNICIPAL WATER DIST.	OAK VIEW	983	Inactive
CASITAS MUTUAL WATER COMPANY	CASITAS SPRINGS	238	Active
CHANNEL ISLANDS BEACH CSD	OXNARD	4,560	Active
CHRISTENSEN COURT	OXNARD	114	Inactive
CITY OF SANTA PAULA	SANTA PAULA	31,018	Active
CITY OF THOUSAND OAKS WATER DEPARTMENT	THOUSAND OAKS	53,157	Active
CLOVERDALE MUTUAL WATER CO.	OXNARD	455	Active
COMMUNITY MUTUAL WATER CO	CAMARILLO	65	Active
CRESTVIEW MUTUAL WATER CO	CAMARILLO	2,079	Active
CYPRESS MUTUAL WATER CO INC	OXNARD	224	Active
DEL NORTE MUTUAL WATER CO.	VENTURA	215	Active
DEMPSEY ROAD MUTUAL WATER CO	OXNARD	990	Active
EL RIO MUTUAL WATER COMPANY	OXNARD	400	Inactive
ELKINS RANCH	FILLMORE	150	Active
ESTERINA PROPERTIES	SANTA BARBARA	50	Active
EVERGREEN TRAILER PARK	HUNTINGTON BEACH	70	Inactive
FILLMORE IRRIGATION CO	FILLMORE	353	Active
FILLMORE WATER DEPT	FILLMORE	16,419	Active
FULLER FALLS MUTUAL WATER CO	VENTURA	23	Inactive
GARDEN ACRES MUTUAL WATER CO	OXNARD	1,335	Active
GOLDEN OAKS MOBILE ESTATE	—	58	Inactive
GOLDEN STATE WATER COMPANY - SIMI VALLEY	RANCHO CORDOVA	45,128	Active
HERMITAGE MUTUAL WATER CO	OJAI	45	Inactive
KROTONA INSTITUTE	OJAI	30	Active
LAKE SHERWOOD	BEVERLY HILLS	400	Inactive
LAS POSAS ORCHARD/SOMIS PACIFIC MGMNT.	Somis	0	Inactive
LIMONEIRA CO. - MCKEVETT	SANTA PAULA	36	Inactive
LIMONEIRA RANCH #1	SANTA PAULA	1,187	Active
LLOYD-BUTLER MUTUAL WATER COMPANY	OXNARD	24	Inactive
MEINERS OAKS CWD	OJAI	4,200	Active
MIDDLE ROAD MUTUAL WATER CO	SANTA PAULA	134	Active
NAVAL BASE VENTURA COUNTY-CAMARILLO HSG.	Point Mugu	0	Inactive
NAVAL BASE VENTURA COUNTY, POINT MUGU	POINT MUGU	5,700	Active
NAVAL BASE VENTURA COUNTY, PORT HUENEME	POINT MUGU	8,625	Active
NAVALAIR MOBILE HOME PARK	OXNARD	160	Active
NEW CAMP BARTLETT	VENTURA	40	Inactive
NYELAND ACRES MUTUAL WATER CO	OXNARD	975	Active
OCEANAIRE MOBILE HOME	0	86	Inactive
OJAI WATER SYSTEM	OAK VIEW	6,801	Active
OXNARD WATER DEPT	OXNARD	200,232	Active
PLAZA MOBILE HOME PARK	OXNARD	74	Inactive
PLEASANT VALLEY MUTUAL WATER CO	CAMARILLO	5,000	Active
PORT HUENEME CITY WATER DEPT	PORT HUENEME	21,407	Active
PORT HUENEME WATER AGENCY	PORT HUENEME	0	Active
RANCHITOS MUTUAL WATER CO	OJAI	267	Inactive
RANCHO SESPE	FILLMORE	500	Inactive
RANCHO SESPE WORKERS IMP ASSOC	VENTURA	600	Active
RINCON WATER & ROAD WORKS	VENTURA	25	Active
RIO MANOR MUTUAL WATER CO	CAMARILLO	983	Active
RIO SCHOOL DIST/ EL RIO SCHOOL	Oxnard	9	Inactive
RISSMAN MUTUAL WATER CO	PIRU	40	Inactive
ROYAL DUKE MOBILE ESTATE	SANTA BARBARA	0	Inactive
SAM EDWARDS ASSOC	SANTA PAULA	201	Inactive
SAN CAYETANO MUTUAL WATER CO	FILLMORE	43	Active
SATICOY COUNTRY CLUB-CITY OF VENTURA	VENTURA	196	Active
SAVIERS ROAD MUTUAL WATER CO	PORT HUENEME	368	Active
SENIOR CANYON MUTUAL WATER CO	OJAI	800	Active
SHERWIN ACRES MUTUAL WATER CO	VENTURA	0	Inactive
SIESTA MOBILE HOME PARK	OXNARD	160	Active
SIETE ROBLES MUTUAL WATER CO	OJAI	323	Active
SILVER WHEEL TRAILER PARK	LOS ANGELES	120	Inactive
SISAR MUTUAL WATER CO	SANTA PAULA	340	Active
SOLANO VERDE MUTUAL WATER CO	CAMARILLO	100	Active
SOUTH MOUNTAIN MUTUAL WATER CO	SANTA PAULA	58	Active
STRICKLAND MUTUAL WATER COMPANY	OXNARD	429	Active
TEAL CLUB MUTUAL WATER CO	OXNARD	18	Inactive
THERMIC MUTUAL WATER CO	Moorpark	38	Inactive
TICO MUTUAL WATER CO	OJAI	72	Active
TRIUNFO WATER & SANITATION DISTRICT	WESTLAKE VILLAGE	13,898	Active
U.S.N., SAN NICOLAS ISLAND	POINT MUGU	254	Active
UNITED WTR CONS DIST	OXNARD	0	Active
VALLEY TRAILER COURT	OXNARD	170	Inactive
VENTURA COUNTY WATER DISTRICT	022	103	Inactive
VENTURA COUNTY WATER DISTRICT	93023	93	Inactive
VENTURA CWWD NO. 1 - MOORPARK	MOORPARK	35,514	Active
VENTURA CWWD NO. 17 - BELL CANYON	MOORPARK	1,946	Active
VENTURA CWWD NO. 19 - SOMIS	MOORPARK	1,429	Active
VENTURA CWWD NO. 38 - LAKE SHERWOOD	MOORPARK	1,759	Active
VENTURA RIVER WATER DISTRICT	OJAI	6,100	Active
VENTURA SCHOOL	CAMARILLO	882	Inactive
VENTURA SCHOOL	CAMARILLO	862	Inactive
VENTURA WATER DEPARTMENT	VENTURA	113,500	Active
VENTURA WWD NO. 8 - SIMI VALLEY	SIMI VALLEY	94,738	Active
VINEYARD AVE ESTATES MWC	OXNARD	1,200	Active
VINEYARD AVENUE ACRES MWC	OXNARD	1,820	Active
WATERS ROAD DOMESTIC USERS GROUP	MOORPARK	25	Active
WHITE STALLION	WESTLAKE VILLAGE	25	Inactive
YERBA BUENA WATER COMPANY	SOLIMA	75	Inactive