San Diego County, California Water Systems

San Diego County, California

133 community water systems on record — 82 active, 51 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 San Diego County, California

System name	City	Population served	Status
ALPINE OAKS ESTATES LLC	DANA POINT	185	Active
ALPINE SPRINGS RV PARK	—	200	Inactive
ANZA BORREGO STATE PARK	BORREGO SPRINGS	75	Inactive
AVERYDALE MUTUAL	—	342	Inactive
BARRETT LAKE MH AND RV LLC	SANTEE	300	Active
BERNITA MUTUAL WATER DISTRICT	EL CAJON	88	Inactive
BORREGO AIR RANCH MUTUAL WATER	BORREGO SPRINGS	30	Inactive
BORREGO SPRINGS	BORREGO SPRINGS	300	Inactive
BORREGO SPRINGS PARK COMMUNITY SERVICES	BORREGO SPRINGS	35	Inactive
BORREGO SPRINGS WC	VISTA	0	Inactive
BORREGO WD	BORREGO SPRINGS	3,429	Active
BUTTERFIELD RANCH	SAN DIEGO	353	Active
CAL-AM WATER CORONADO	IMPERIAL BEACH	106,000	Active
CAMP PENDLETON (NORTH)	CAMP PENDLETON	12,651	Active
CAMP PENDLETON (SOUTH)	CAMP PENDLETON	42,219	Active
CAMP STEVENS	JULIAN	78	Active
CAMPO HILLS-COUNTY PUBLIC WORKS WASTEWTR	SPRING VALLEY	500	Active
CANYON CITY LAKES	CAMPO	100	Inactive
CARLSBAD DESALINATION PLANT	CARLSBAD	0	Active
CARLSBAD MWD	CARLSBAD	95,158	Active
CARLSBAD WATER DIVISION	CARLSBAD	37,000	Inactive
CREST PUBLIC UTILITY DIST	EL CAJON	624	Inactive
CSP-ARROYO SECO TRAIL CAMP	DESCANSO	0	Inactive
CSP-DYAR CITY SCHOOL CAMP	DESCANSO	0	Inactive
CUYAMACA WATER DISTRICT	JULIAN	2,923	Active
DEL DIOS MUTUAL WATER COMPANY	ESCONDIDO	330	Active
DEL MAR, CITY OF	DEL MAR	3,919	Active
DESCANSO COMMUNITY WATER DISTRICT	SACRAMENTO	870	Active
ESCONDIDO, CITY OF	ESCONDIDO	137,044	Active
FACILITIES MAINTENANCE OFFICE	CAMP PENDLETON	8,000	Inactive
FACILITIES MAINTENANCE OFFICE	CAMP PENDLETON	2,700	Inactive
FALLBROOK PUD	FALLBROOK	35,237	Active
FRIENDLY FARM	PAUMA VALLEY	20	Inactive
GREGORY CANYON PARTNERS LIMITED	OCEANSIDE	48	Inactive
GUATAY MUTUAL BENEFIT CORPORATION	GUATAY	100	Active
H & J WATER COMPANY	JULIAN	86	Active
HALEY'S TRAILER PARK	POWAY	225	Inactive
HARBISON CANYON ESTATES	SAN DIEGO	140	Inactive
HATFIELD CREEK EGG RANCH INC.	SANTA YSABEL	40	Inactive
HEAVENLY OAKS	SANTEE	300	Active
HELIX WATER DISTRICT	LA MESA	277,668	Active
INDIAN HILLS CAMP	JAMUL	13,032	Active
IRON SPRINGS WATER GROUP	JULIAN	50	Inactive
J J PORTER	JULIAN	100	Inactive
JACUMBA COMMUNITY SD	JACUMBA	561	Active
JULIAN COMMUNITY SERVICES DISTRICT	JULIAN	1,517	Active
LA CIMA CONSERVATION CAMP	DESCANSO	140	Inactive
LA CIMA CONSERVATION CAMP	DESCANSO	140	Inactive
LA CIMA FIRE CENTER	JULIAN	60	Active
LA COUNTY WATER DISTRICT # 37	LA VERNE	48	Inactive
LAGUNA MOUNTAIN MUTUAL WATER CO.	MT LAGUNA	100	Active
LAKE HENSHAW RESORT INC.	SANTA YSABEL	9,913	Active
LAKE MORENA TRAILER RESORT	CAMPO	60	Inactive
LAKE MORENA VIEWS MWC	PASADENA	360	Active
LAKE MORENA'S OAK SHORES MWC	CAMPO	670	Active
LAKE WOHLFORD RESORT	COSTA MESA	250	Active
LAKESIDE WD	LAKESIDE	35,500	Active
LAZY H MUTUAL WATER COMPANY	PAUMA VALLEY	142	Active
LIVE OAK SPRINGS WATER SYSTEM	SPRING VALLEY	317	Active
LOS ANGELES CO WW DIST 1	ALHAMBRA	5,750	Inactive
LOS ANGELES CO WW DIST 16	ALHAMBRA	2,550	Inactive
LOS ANGELES CO WW DIST 22	ALHAMBRA	8,320	Inactive
LOS ANGELES CO WW DIST 26	LOS ANGELES	1,498	Inactive
LOS TULES MUTUAL WATER COMPANY	WARNER SPRINGS	238	Active
MAJESTIC PINES COMMUNITY SD	JULIAN	1,768	Active
MCCAIN VALLEY CC #21	JAMESTOWN	130	Inactive
MCCAIN VALLEY CONS CAMP	BOULEVARD	150	Inactive
MHC TT INC. (DBA PIO PICO)	JAMUL	828	Active
MORENA CONSERVATION CAMP	CAMPO	110	Inactive
MORENA CONSERVATION CAMP	CAMPO	110	Inactive
NAS NORTH ISLAND & NAB CORONADO	SAN DIEGO	36,990	Active
NAVAL MEDICAL CENTER SAN DIEGO	—	2,981	Active
NAVY POINT LOMA FACILITIES	SAN DIEGO	0	Inactive
NORTH PEAK MUTUAL WATER COMPANY	JULIAN	298	Active
OAKVALE PARK	ESCONDIDO	260	Active
OCEANSIDE, CITY OF	OCEANSIDE	171,483	Active
OCOTILLO OASIS, LLC	SAN MARCOS	96	Active
OLIVENHAIN MWD	ENCINITAS	86,458	Active
OTAY MUNI WATER DIST	SPRING VALLEY	20,314	Inactive
OTAY WATER DISTRICT	SPRING VALLEY	238,008	Active
PADRE DAM MWD	SANTEE	93,980	Active
PADUA HILLS WATER SERVICE	CLAREMONT	228	Inactive
PALOMAR CHRISTIAN CONFERENCE CENTER	PALOMAR MOUNTAIN	13,050	Active
PALOMAR MOUNTAIN MUTUAL WATER CO.	BONITA	193	Active
PALOMAR OBSERVATORY	PALOMAR MOUNTAIN	4,416	Active
PARADISE RANCH	CASTAIC	500	Inactive
PAUMA VALLEY WATER COMPANY	PAUMA VALLEY	185	Active
PINE HILLS MUTUAL WATER COMPANY	JULIAN	760	Active
PINE VALLEY BIBLE CONFERENCE CENTER	PINE VALLEY	255	Active
PINE VALLEY MUTUAL WC	PINE VALLEY	2,645	Active
PINE VALLEY TRAILER PARK	COSTA MESA	200	Active
POWAY, CITY OF	POWAY	49,888	Active
PUERTA LA CRUZ CC #14	WARNER SPRINGS	27	Active
QUIET OAKS MOBILE HOME PARK	STOCKTON	120	Active
RAINBOW MUNICIPAL WD	FALLBROOK	23,536	Active
RAMONA MUNICIPAL WD	RAMONA	37,047	Active
RANCHO BORREGO MUTUAL WATER CO	BORREGO SPRINGS	200	Inactive
RANCHO CORRIDO RV RESORT	COSTA MESA	350	Inactive
RANCHO DEL CAMPO WATER SYSTEM	SPRING VALLEY	290	Active
RANCHO ESTATES MUTUAL WATER CO.	PAUMA VALLEY	200	Active
RANCHO PAUMA MUTUAL WC	PAUMA VALLEY	899	Active
RANCHO SANTA TERESA MW CO.	RAMONA	102	Active
RICHARDSON BEARDSLEY PARK INC.	JULIAN	28	Active
RICHLAND FARMS MUTUAL WTR CO	COMPTON	1,688	Inactive
RINCON DEL DIABLO MWD (ID-1)	ESCONDIDO	30,757	Active
RINCON DEL DIABLO MWD (ID-A)	ESCONDIDO	3,275	Active
RIVERVIEW WD	Lakeside	0	Inactive
RT 1 BOX 155E JAMUL 92035	—	6	Inactive
SAN DIEGO COUNTY WATER AUTHORITY	SAN DIEGO	0	Active
SAN DIEGO, CITY OF	SAN DIEGO	1,385,379	Active
SAN DIEGUITO WD	ENCINITAS	40,405	Active
SAN PASQUAL ACADEMY	SPRING VALLEY	298	Active
SANTA FE I.D.	RANCHO SANTA FE	21,578	Active
SANTIAGO ESTATES	SANTA ANA	150	Inactive
SOMERSET MUTUAL WATER CO	BELLFLOWER	15,000	Inactive
SUNRISE ESTATES MUTUAL WATER COMPANY	JAMUL	150	Active
SWEETWATER AUTHORITY	CHULA VISTA	191,282	Active
TAMARISK GROVE STATE PARK	BORREGO SPRINGS	73	Inactive
TWIN LAKES RESORT	LA MESA	400	Active
U S AIR FORCE PLANT 42	PALMDALE	25	Inactive
USFS SHORT CUT CANYON	AQUA DULCE	50	Inactive
USFS VALVERMO 10-54-1839	PASADENA	25	Inactive
USN FASOTRAGRUPAC	WARNER SPRINGS	170	Inactive
VALLECITOS WD	SAN MARCOS	113,500	Active
VALLEY CENTER MWD	VALLEY CENTER	29,938	Active
VISTA IRRIGATION DISTRICT	VISTA	132,430	Active
W E AND M MARTIN TRAILER PARK	OCOTILLO	130	Inactive
WARNER SPRINGS ESTATES	TEMECULA	448	Active
WILLOWSIDE TERRACE WATER ASSOCIATION	ALPINE	100	Active
WYNOLA WATER DISTRICT	SAN YSABEL	140	Active
YMCA CAMP MARSTON/RAINTREE	JULIAN	338	Active
YUIMA MUNICIPAL WATER DISTRICT	PAUMA VALLEY	360	Active
YUIMA MUNICIPAL WATER DISTRICT IDA	PAUMA VALLEY	769	Active