San Diego County
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San Diego County · tap water by city

San Diego County tap water, city by city.

FilteredWTR tracks 31 public water systems in San Diego County, and their own population counts add up to 3,427,616 people. Over the last three years one of them, Indian Hills Camp, picked up 16 health-based violations on its EPA record. In the latest round of lead testing, 17 systems reported a 90th-percentile result of zero. None came in at or above 0.0075 mg/L, which is half the federal action level of 0.015 mg/L.

Water systems in San Diego County

The largest systems come first. Lead is each system's most recent 90th-percentile result from the federal Lead and Copper Rule, and the last column counts health-based violations from the last three years. Systems sample on their own schedules, so their monitoring periods end anywhere from 2022 to 2027.

Water systemCities servedPeople servedLatest lead (90th percentile)Recent health violations
City of San DiegoSan Diego1,408,937Not detected, period ending 20260
Helix Water DistrictEl Cajon, La Mesa, Lemon Grove277,918Not detected, period ending 20240
Otay Water DistrictJamul, Spring Valley242,155Not detected, period ending 20260
Sweetwater AuthorityBonita, Chula Vista, National City184,915Not detected, period ending 20230
City of OceansideOceanside174,340Not detected, period ending 20240
City of EscondidoEscondido137,0440.0011 mg/L, period ending 20240
Vista Irrigation DistrictVista134,501Not detected, period ending 20240
Vallecitos WDSan Marcos114,700Not detected, period ending 20260
Cal-Am Water CoronadoCoronado, Imperial Beach106,0000.002 mg/L, period ending 20260
Carlsbad MWDCarlsbad96,371Not detected, period ending 20240
Padre Dam MWDSantee93,9800.0011 mg/L, period ending 20250
Olivenhain MWDRancho Santa Fe86,458Not detected, period ending 20250
City of PowayPoway49,888Not detected, period ending 20250
Camp Pendleton (South)Not listed44,5550.00051 mg/L, period ending 20250
San Dieguito WDCardiff By The Sea, Encinitas40,4050.0011 mg/L, period ending 20250
Ramona Municipal WDRamona36,4550.0017 mg/L, period ending 20250
Lakeside WDLakeside35,500Not detected, period ending 20250
Fallbrook PUDFallbrook35,2370.001 mg/L, period ending 20240
Valley Center MWDValley Center30,1660.004 mg/L, period ending 20220
Rincon Del Diablo MWD (ID-1)Not listed28,427Not detected, period ending 20250
Rainbow Municipal WDRainbow23,5360.0027 mg/L, period ending 20240
Santa Fe I.D.Not listed21,5390.0017 mg/L, period ending 20250
Camp Pendleton (North)Not listed11,5760.00005 mg/L, period ending 20250
Rincon Del Diablo MWD (ID-A)Not listed5,0160.0033 mg/L, period ending 20260
City of Del MarDel Mar3,9500.0013 mg/L, period ending 20270
Borrego WDBorrego Springs3,429Not detected, period ending 20270
NAS North Island & NAB CoronadoNot listed4210.00127 mg/L, period ending 20260
Lake Henshaw Resort Inc.Not listed108Not detected, period ending 20250
Indian Hills CampNot listed36Not detected, period ending 202616
Palomar Christian Conference CenterNot listed33Not detected, period ending 20250
Palomar ObservatoryNot listed20Not detected, period ending 20230

Find your city

Each report covers the water system that serves that city, with its measured results and its full EPA compliance history.

What these numbers mean

Every system has to collect tap samples from a set list of homes and report the lead level at the 90th percentile. Nine out of ten sampled homes came in at or below that figure. The federal action level is 0.015 mg/L, and a system that goes over it has to take corrective steps and tell its customers. A zero means the samples came back below what the lab can detect.

A health-based violation means the system broke a rule tied to health, such as going over a contaminant limit or missing a required treatment step. Late paperwork and skipped reports go on the EPA record too, and this page leaves those out.

These figures describe the water each system sends out, and the water at your own faucet can test differently. Lead most often enters from a home's own pipes and fixtures, so houses built before 1986 are worth a closer look. Chlorine levels also drift with how far a street sits from the treatment plant.

Free local water test

See your own water in person before spending money on treatment.

A local FilteredWTR tech screens the water at your faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.

Text 949-414-9944 for a free water test

Other county reports: Orange County · Los Angeles County · Riverside County · San Bernardino County · Ventura County · Imperial County · All cities