Sonoma County, California Water Systems

Sonoma County, California

221 community water systems on record — 130 active, 91 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 August 1, 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 Sonoma County, California

System name	Mailing city	Population served	Status
SANTA ROSA, CITY OF	SANTA ROSA	175,396	Active
PETALUMA, CITY OF	PETALUMA	60,781	Active
ROHNERT PARK, CITY OF	ROHNERT PARK	43,821	Active
WINDSOR, TOWN OF	WINDSOR	25,561	Active
VALLEY OF THE MOON WATER DISTRICT	EL VERANO	23,107	Active
SONOMA, CITY OF	SONOMA	11,725	Active
SONOMA STATE UNIVERSITY	ROHNERT PARK	10,986	Active
HEALDSBURG, CITY OF	HEALDSBURG	10,985	Active
CLOVERDALE, CITY OF	CLOVERDALE	10,398	Active
CALIFORNIA-AMERICAN LARKFIELD (PUC)	SACRAMENTO	7,913	Active
SEBASTOPOL, CITY OF	SEBASTOPOL	7,522	Active
COTATI, CITY OF	COTATI	7,303	Active
SWEETWATER SPRINGS CWD - GUERNEVILLE	GUERNEVILLE	6,000	Active
RUSSIAN RIVER COUNTY WATER DISTRICT	FORESTVILLE	4,150	Active
SONOMA STATE HOSPITAL	PORTERVILLE	3,970	Inactive
FORESTVILLE WATER DISTRICT	FORESTVILLE	3,788	Active
SWEETWATER SPRINGS CWD - MONTE RIO	GUERNEVILLE	3,000	Active
PENNGROVE WATER COMPANY (PUC)	SANTA ROSA	1,742	Active
SONOMA DEVELOPMENTAL CENTER	ELDRIDGE	1,500	Inactive
SONOMA COUNTY CSA 41-FITCH MOUNTAIN	SANTA ROSA	1,265	Active
CAMP MEEKER WATER SYSTEM	CAMP MEEKER	1,171	Active
SEA RANCH WATER COMPANY,THE (PUC)	SEA RANCH	1,160	Active
BODEGA BAY PUBLIC UTILITY DISTRICT	BODEGA BAY	1,069	Active
CALIFORNIA-AMERICAN GEYSERVILLE (PUC)	SACRAMENTO	1,046	Active
KENWOOD VILLAGE WATER COMPANY (PUC)	SANTA ROSA	1,029	Active
RUSSIAN RIVER WC RIO DELL DIS	PENNGROVE	900	Inactive
CANON MANOR WATER SYSTEM	SANTA ROSA	805	Active
ODD FELLOWS RECREATION CLUB	GUERNEVILLE	757	Active
MOON VALLEY WATER SYSTEM	SONOMA	691	Active
DIAMOND A MUTUAL WATER COMPANY	SONOMA	640	Active
OCCIDENTAL COMMUNITY SERVICES DISTRICT	OCCIDENTAL	533	Active
CAZADERO WATER COMPANY, INC. (PUC)	FORESTVILLE	525	Active
CEDARVILLE COUNTY WATER DISTRI	CEDARVILLE	500	Inactive
ODD FELLOWS PARK	GUERNEVILLE	500	Inactive
ARMSTRONG VALLEY-CAL WATER SERVICE (PUC)	SAN JOSE	473	Active
U.S. COAST GUARD TRAINING CENTER	PETALUMA	469	Active
RINCON VALLEY MOBILE ESTATES	NOVATO	460	Active
WILLOWSIDE MUTUAL WATER COMPANY	SANTA ROSA	448	Active
BENNETT RIDGE MUTUAL WATER COMPANY	SANTA ROSA	439	Active
SERENO DEL MAR WATER COMPANY (PUC)	FORESTVILLE	435	Active
SONOMA COUNTY CSA 41-SALMON CREEK	SANTA ROSA	427	Active
SANTA ROSA MOBILE ESTATES	SAN LEANDRO	420	Active
ALLIANCE REDWOODS CONFERENCE GROUNDS	OCCIDENTAL	418	Active
LEISURE MOBILE HOME PARK	SANTA ROSA	410	Active
SONOMA COUNTY CSA 41-JENNER	SANTA ROSA	406	Active
BROOKWOOD MOBILE HOME PARK	SANTA ROSA	400	Inactive
HEIGHTS MUTUAL WATER COMPANY	FORESTVILLE	363	Active
COLONIAL PARK	HEALDSBURG	342	Active
BRANGER MUTUAL WATER COMPANY, INC.	SANTA ROSA	300	Active
HOLLAND HEIGHTS MUTUAL WATER COMPANY	SANTA ROSA	300	Active
LOS GUILUCOS JUVENILE FACILITY	SANTA ROSA	300	Inactive
PALOMINO LAKES MUTUAL WATER CO.	CLOVERDALE	300	Active
SEQUOIA GARDENS MOBILE HOME PARK	SANTA ROSA	300	Inactive
GILL CREEK MUTUAL WATER COMPANY	GEYSERVILLE	290	Active
SONOMA COUNTY CSA 41-FREESTONE	SANTA ROSA	290	Active
CARMET BY THE SEA WATER COMPANY	BODEGA BAY	288	Active
BELMONT TERRACE MUTUAL WATER COMPANY	SEBASTOPOL	287	Active
TIMBER COVE COUNTY WATER DISTRICT	JENNER	271	Active
HAPPY ACRES MUTUAL BENEFIT WATER SYSTEM	COTATI	260	Active
MOUNTAIN VIEW MOBILE ESTATES, LLC	NEWPORT BEACH	250	Active
COLLEGE PARK MUTUAL WATER COMPANY	PENNGROVE	244	Active
MAGIC MOUNTAIN MUTUAL WATER COMPANY	SANTA BARBARA	221	Active
NORTH STAR MOBILE HOME PARK	SANTA ROSA	221	Active
LAWNDALE MUTUAL WATER COMPANY	KENWOOD	218	Active
MOBILE HOME ESTATES	SANTA ROSA	210	Active
JAMES COURT WATER SYSTEM	SANTA ROSA	208	Active
RAINS CREEK WATER DISTRICT	CLOVERDALE	208	Active
EL PORTAL MOBILE ESTATES	SANTA ROSA	200	Active
RANDAL'S RANCHETTE MUTUAL WATER COMPANY	SANTA ROSA	200	Active
YULUPA MUTUAL WATER COMPANY	SANTA ROSA	200	Active
STONEGATE MOBILE HOME PARK	LOS ANGELES	196	Active
SHAMROCK MOBILE HOME PARK	SANTA ROSA	188	Active
SONOMA MOUNTAIN COUNTY WATER DISTRICT	SANTA ROSA	181	Active
JOURNEY'S END MOBILE HOME PARK	SANTA CRUZ	180	Inactive
RIO LINDO ADVENTIST ACADEMY	HEALDSBURG	178	Active
WESTERN MOBILE HOME PARK	STOCKTON	178	Active
RANCHO SANTA ROSA MHP	COSTA MESA	175	Inactive
PLAZA MOBILE HOME PARK	STOCKTON	169	Active
SONOMA RANCH MUTUAL WATER COMPANY	HERCULES	151	Active
AUSTIN CREEK MUTUAL (SPRINGHILL)	CAZADERO	150	Active
MISSION HIGHLANDS MUTUAL WATER CO.	SONOMA	150	Active
RIEBLI MUTUAL WATER COMPANY	FULTON	150	Active
GEORGE RANCH MUTUAL WATER COMPANY	HERCULES	148	Active
SUNSET PARK COMMUNITY	SANTA ROSA	141	Active
KELLY MUTUAL WATER COMPANY	SEBASTOPOL	135	Active
EL CRYSTAL MOBILE HOME PARK	SAN JUAN CAPISTRANO	130	Inactive
ROSELAND MOBILE HOME PARK	SAN JUAN CAPISTRANO	130	Active
END-O-VALLEY MUTUAL WATER COMPANY	SANTA ROSA	129	Active
FIRCREST MUTUAL WATER COMPANY	SEBASTOPOL	126	Active
CAPRI MOBILE VILLA	PETALUMA	122	Inactive
DOWNTOWN GRATON MUTUAL WATER SYSTEM	GRATON	115	Active
BRAND WATER COMPANY	OAKLAND	112	Active
CANON MANOR WATER COMPANY	—	110	Inactive
FIRE MTN LODGE	GUERNEVILLE	100	Inactive
FORT BIDWELL INDIAN RESERVATIO	TULELAKE	100	Inactive
HILTON MUTUAL WATER COMPANY	FORESTVILLE	100	Active
SONOMA MISSION APARTMENTS	KENTFIELD	100	Inactive
SUNRISE MOUNTAIN MUTUAL WATER COMPANY	CAZADERO	100	Active
RANCHO DEL PARADISO-CAL WATER SVC (PUC)	SAN JOSE	94	Active
MICHELE MUTUAL WATER COMPANY	FULTON	93	Active
BLUE SPRUCE MOBILE HOME PARK	SACRAMENTO	90	Active
SOUTH CLOVERDALE WATER COMPANY	CLOVERDALE	90	Active
VALLEY FORD WATER ASSOCIATION	VALLEY FORD	88	Active
RUSSIAN RIVER MUTUAL WATER CO.	HEALDSBURG	87	Active
AUSTIN ACRES MUTUAL WATER COMPANY	DUNCANS MILLS	82	Active
WENDELL LANE MUTUAL WATER COMPANY	SEBASTOPOL	82	Active
HAWKINS WATER CO-CAL WATER SERVICE (PUC)	SAN JOSE	81	Active
BLACK MOUNTAIN	CALZADERO	80	Inactive
BLACK MOUNTAIN CONSERVATION CA	CAZADERA	80	Inactive
SOBRE VISTA WATER COMPANY	EL VERANO	80	Active
NOEL HEIGHTS-CAL WATER SERVICE (PUC)	SAN JOSE	79	Active
BODEGA WATER COMPANY	BODEGA	77	Active
MADRONE MUTUAL WATER COMPANY	COTATI	76	Active
PARK ROYAL MUTUAL WATER COMPANY	SANTA ROSA	75	Active
WEST FIELD COMMUNITY	SANTA ROSA	75	Inactive
WEST WATER COMPANY	95425	75	Inactive
BRESSIE, V L WATER SYSTEM - MI	—	72	Inactive
BRIDGEHAVEN PARK	SACRAMENTO	70	Active
JUDY WEBER	TULE LAKE	70	Inactive
WILSHIRE HEIGHTS MUTUAL WATER COMPANY	SANTA ROSA	70	Active
CAMP THAYER SUBDIVISION	CAZADERO	66	Inactive
ROBIN WAY WATER SYSTEM	FAIRFIELD	66	Active
SIX ACRES WATER COMPANY	SAN FRANCISCO	66	Active
EVERGREEN MOBILE ESTATES	STOCKTON	65	Active
LONE PINE MUTUAL WATER COMPANY	SEBASTOPOL	65	Active
MELITA HEIGHTS MUTUAL WATER COMPANY	SANTA ROSA	64	Active
MOORLAND AVENUE APARTMENTS	SEBASTOPOL	64	Inactive
WESTSIDE WATER DISTRICT	TULE LAKE	64	Inactive
MARK WEST ACRES MWC	SANTA ROSA	61	Active
AUSTIN CREEK BLOCKS 14 & 15	EL CERRITO	60	Inactive
BOULEVARD HEIGHTS MUTUAL WATER	PETALUMA	60	Active
MARK WEST ESTATES	San Rafael	60	Inactive
TERRACE VIEW WATER SYSTEM	ROHNERT PARK	60	Active
DELORES LANE WATER SYSTEM	SANTA ROSA	59	Active
SONOMA SPRINGS	GLEN ELLEN	59	Active
LICHAU HYLANDS MUTUAL WATER COMPANY	PENNGROVE	56	Active
ATHENA TERRACE MUTUAL WATER COMPANY	SANTA ROSA	50	Active
GRATON MUTUAL WATER SYSTEM	ROHNERT PARK	50	Active
WALLACE PARK MUTUAL	SANTA ROSA	50	Inactive
EDDY DRIVE	NAPA	48	Active
KINNYBROOK MUTUAL WATER COMPANY	KENWOOD	48	Active
AUSTIN CREEK BLOCKS 17 & 19	RIO VISTA	45	Inactive
HUCKLEBERRY MUTUAL WATER COMPANY	CAZADERO	45	Active
SUMMIT VIEW RANCH MUTUAL WATER CO.	SANTA ROSA	45	Active
TERRACE VIEW MUTUAL WATER CO.	PETALUMA	45	Inactive
WEST WATER COMPANY	CLOVERDALE	45	Inactive
PARADISE GROVE ASSN	SANTA ROSA	42	Inactive
VINEHILL VISTAS MUTUAL WATER COMPANY	SEBASTOPOL	42	Active
WEST BEACH MUTUAL WATER COMPAN	BODEGA BAY	42	Inactive
CALIFORNIA DEPT OF FORESTRY	SANTA ROSA	40	Inactive
CLEAR CREEK WATER COMPANY	CLOVERDALE	40	Active
CRYSTALS	SANTA ROSA	40	Active
SONOMA COUNTY MUTUAL WATER COMPANY	SAN FRANCISCO	40	Active
WEST WATER COMPANY (PUC)	SANTA ROSA	40	Active
CORBY AVENUE APARTMENTS	SANTA ROSA	38	Active
SHADY LANE MOBILE HOME PARK-INACTIVE	Santa Rosa	38	Inactive
ODIYAN BUDDHIST RETREAT CENTER	CAZADERO	35	Active
LARKIN WOODS MUTUAL WATER COMPANY	SEBASTOPOL	34	Active
LOST RIVER WATER DISTRICT	TULE LAKE	33	Inactive
JAYLEE HEIGHTS MUTUAL WATER CO	SANTA ROSA	30	Inactive
REDWOOD HEIGHTS MUTUAL WATER COMPANY	CAZADERO	30	Active
ROYAL WINDSOR COTTAGES	SANTA ROSA	30	Inactive
DRY CREEK RANCHERIA	GEYSERVILLE	28	Inactive
MAR LINDA MOTEL	SANTA ROSA	28	Inactive
ALEXANDER VALLEY ACRES WATER COMPANY	HEALDSBURG	27	Active
PINE HILL TERRACE MOBILE HOME PARK	SEBASTOPOL	27	Active
LOCH HAVEN MUTUAL WATER COMPANY	SANTA ROSA	26	Active
MOUNT WESKE ESTATES MUTUAL WATER COMPANY	WINDSOR	26	Inactive
B EDWARD HINKLE, PRESIDENT	SANTA ROSA	25	Inactive
BELLEVIEW AVE APARTMENTS	SANTA ROSA	25	Inactive
CLEARWATER RANCH	CLOVERDALE	25	Inactive
HANDY'S CORNER SUBDIVISION	SEBASTOPOL	25	Inactive
ROLLING OAKS ROAD ASSOCIATION	ROHNERT PARK	25	Active
TROY-BREEZE WATER SYSTEM	SANTA ROSA	25	Inactive
VIEWS LAND COMPANY	EASTVIEW	25	Inactive
Unnamed system (CA4900942)	GEYSERVILLE	25	Inactive
DUSCHO WATER	CLOVERDALE	20	Inactive
MARK WEST MEADOWS MUTUAL WATER	SANTA ROSA	20	Active
RURAL CANYON MUTUAL WATER COMPANY	Forestville	20	Inactive
MELODY INN TRAILER PARK	SAN FRANCISCO	16	Inactive
CLOVER CREST WATER CORPORATION	25	12	Inactive
HOEL, MRS	95401	3	Inactive
ACACIA GROVE MOBILE HOME PARK	—	0	Inactive
APARTMENTS 939-963 ASTON	SANTA ROSA	0	Inactive
ARROYO CHICO SUBDIVISION	GRATON	0	Inactive
ASTON AVENUE APARTMENTS	SANTA ROSA	0	Inactive
BELGLEN MUTUAL WATER COMPANY	SEBASTOPOL	0	Inactive
BLACK MOUNTAIN CONSERVATN CAMP	CAZADERO	0	Inactive
BORDEN VILLA CONDOMINIUM ASSOCIATION	SANTA ROSA	0	Inactive
BUCHER WATER	HEALDSBURG	0	Inactive
CAMP MEEKER WATER SYSTEMS, INC.	FORESTVILLE	0	Inactive
COTTAGE APARTMENTS	SANTA ROSA	0	Inactive
CREEKSIDE APARTMENTS	EL VERANO	0	Inactive
CREEKWOOD ACRES	DALY CITY	0	Inactive
FOOTHILLS WATER VENTURE II	SANTA ROSA	0	Inactive
GOLD RIDGE MUTUAL WATER CO	SEBASTOPOL	0	Inactive
HOLLOW TREE GROCERY	ANNAPOLIS	0	Inactive
HOLLYDALE MUTUAL WATER COMPANY	FORESTVILLE	0	Inactive
KASHIA INDIAN RANCHERIA	STEWARTS POINT	0	Inactive
LA MANCHA APARTMENTS	SANTA ROSA	0	Inactive

Showing the 200 largest of 221 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.