Counties → California

San Mateo County, California

Water Systems

Population Served

782,067

Total Violations

1,318

PFAS Detected

of 19 tested

Water Systems

System Name	Population	Violations	PFAS
CITY OF DALY CITY	104,901	12	Detected
CALIFORNIA WATER SERVICE - SAN MATEO	102,348	7	Clean
CITY OF REDWOOD CITY	92,819	8	Clean
CALIFORNIA WATER SERVICE-S SAN FRANCISCO	64,146	8	Detected
CALIFORNIA WATER SERVICE - BEAR GULCH	61,431	9	Clean
CITY OF SAN BRUNO	41,327	2	Detected
NORTH COAST COUNTY WATER DIST	38,546	5	Clean
ESTERO MUNICIPAL IMPROVEMENT DISTRICT	36,556	7	Clean
CALIFORNIA WATER SERVICE - SAN CARLOS	35,344	8	Clean
CITY OF BURLINGAME	31,451	9	Clean
MID-PENINSULA WATER DISTRICT	30,609	6	Clean
CITY OF EAST PALO ALTO	29,519	23	Clean
CITY OF MILLBRAE	22,795	0	Clean
MENLO PARK MUNICIPAL WATER	22,362	3	Clean
COASTSIDE COUNTY WATER DISTRICT	18,940	33	Clean
WESTBOROUGH WATER DISTRICT	13,486	4	Clean
TOWN OF HILLSBOROUGH	11,766	5	Clean
MONTARA WATER AND SANITARY DISTRICT	6,078	11	Clean
CITY OF BRISBANE	3,402	17	—
PALO ALTO PARK MUTUAL WATER COMPANY	2,900	9	—
O'CONNOR TRACT CO-OPERATIVE WATER CO.	2,789	12	—
SAN MATEO COUNTY MEMORIAL PARK	1,790	26	—
GUADALUPE VALLEY MID	1,472	8	Detected
CUESTA LA HONDA GUILD INC	915	74	—
CSP - ANO NUEVO STATE PARK	709	2	—
COSTANOA CAMPGROUND	583	19	—
COUNTY SERVICE AREA 11	450	47	—
CAMP JONES GULCH	357	8	—
COUNTY SERVICE AREA 7	300	84	—
CAMP LOMA MAR	208	69	—
OPTIMISTS VOLUNTEERS FOR YOUTH	207	4	—
PESCADERO HIGH SCHOOL	192	14	—
CSP - PORTOLA STATE PARK	181	32	—
BUTANO CANYON MUTUAL	150	49	—
REDWOOD GLEN CAMP & CONFERENCE CTR	114	25	—
HARLEY FARMS GOAT DAIRY	113	0	—
BUTANO STATE PARK - CSP	95	10	—
PORTOLA IMPROVEMENT ASSOCIATION MWC	90	53	—
PIGEON POINT HOSTEL	67	7	—
LOMA MAR MUTUAL	65	67	—
BIANCHI FLOWERS INC	65	9	—
REDWOOD TERRACE MUTUAL	56	137	—
MARCHI CENTRAL FARM	50	24	—
SKYLAWN MEMORIAL PARK (SKYLAWN INC)	50	131	—
MARTINS BEACH WATER SYSTEM	49	13	—
OKU INCORPORATED	35	94	—
UC ELKUS RANCH	34	30	—
LA HONDA CENTER	33	17	—
GAZOS CREEK BEACH HOUSE	33	3	—
SAN GREGORIO COMPANY	32	27	—