Tap Truth EPA drinking water records, in plain English

County drinking water records

San Diego County, CA drinking water systems

95 community water systems serve San Diego County, CA, reporting 3,549,710 people served in all. A system that also serves other counties counts all of its customers here.

34 of them (36%) had at least one health-based violation in the last 10 years. 16 systems still have one unresolved.

61 rely mainly on groundwater and 34 on surface water, counting water bought from other systems.

93 systems filed a lead service line inventory listing 0 lead lines, 15 galvanized lines that must be replaced and 1,269 lines of unknown material.

13 more systems are placed in San Diego County, CA by mailing address or by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
95
People served, sum of each system's own figure
3,549,710
Systems with a health-based violation, last 10 years
34
Systems with one unresolved
16
Lead service lines in inventories
0

Water systems serving San Diego County

95 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
City of San Diego San Diego 1,385,379 Surface water 0 0 0
Helix Water District El Cajon, La Mesa and 9 more 277,668 Surface water 0 0 0
Otay Water District Chula Vista, Jamul and 4 more 238,008 Purchased surface water 0 0 0
Sweetwater Authority Chula Vista, National City and 2 more 191,282 Surface water 0 0 0
City of Oceanside Oceanside 171,483 Purchased surface water 0 0 0
City of Escondido Escondido 137,044 Surface water 0 0 0
Vista Irrigation District Vista 132,430 Surface water 0 0 0
Vallecitos WD San Marcos, Escondido and 3 more 113,500 Purchased surface water 0 1 0
Cal-Am Water Coronado San Diego, Coronado and 1 more 106,000 Purchased surface water 1 0 0
Carlsbad MWD Carlsbad 95,158 Purchased surface water 0 0 0
Padre Dam MWD Santee, Alpine and 5 more 93,980 Purchased surface water 0 0 0
Olivenhain MWD Encinitas, Carlsbad and 2 more and land outside them 86,458 Purchased surface water 0 0 0
City of Poway Poway 49,888 Surface water 0 0 0
Camp Pendleton (South) Camp Pendleton Mainside and Camp Pendleton South and land outside them 42,219 Groundwater 3 0 0
San Dieguito WD Encinitas 40,405 Purchased surface water 0 0 0
Ramona Municipal WD Ramona and San Diego Country Estates 37,047 Purchased surface water 0 0 0
Nas North Island & Nab Coronado Coronado 36,990 Purchased surface water 0 0 0
Lakeside WD Eucalyptus Hills, Lakeside and 1 more 35,500 Purchased surface water 0 0 0
Fallbrook PUD Fallbrook and land outside it 35,237 Purchased surface water 0 0 0
Rincon Del Diablo MWD (Id-1) Escondido, Harmony Grove and 1 more 30,757 Purchased surface water 0 0 0
Valley Center MWD Valley Center and Hidden Meadows and land outside them 29,938 Purchased surface water 0 0 0
Pechanga Oceanside 29,100 Purchased surface water 0 2 0
Rainbow Municipal WD Bonsall, Rainbow and 1 more and land outside them 23,536 Purchased surface water 0 0 0
Santa Fe I.D. Rancho Santa Fe, Solana Beach and 1 more 21,578 Surface water 0 0 0
Pala North Pala 14,280 Groundwater 13 2 0
Camp Pendleton (North) Outside cities and towns 12,651 Groundwater 1 0 0
Sycuan Jamul and Rancho San Diego 12,350 Purchased surface water 0 0 0
Lake Henshaw Resort Inc. Outside cities and towns 9,913 Groundwater 1 0 0
Viejas Community System Chula Vista, La Presa and 2 more 9,600 Groundwater 0 1 0
Rincon Northern Oceanside 7,003 Groundwater 0 0 0
Palomar Observatory Outside cities and towns 4,416 Groundwater 0 0 0
City of Del Mar Del Mar 3,919 Purchased surface water 0 0 0
Borrego WD Borrego Springs 3,429 Groundwater 0 0 0
Rincon Del Diablo MWD (Id-A) Escondido and land outside it 3,275 Purchased surface water 0 0 0
Cuyamaca Water District Outside cities and towns 2,923 Groundwater 1 0 0
Pine Valley Mutual WC Pine Valley 2,645 Groundwater 8 0 0
Majestic Pines Community SD Julian 1,768 Groundwater 1 2 No inventory
Julian Community Services District Julian 1,517 Groundwater 1 2 No inventory
San Pasqual District A Outside cities and towns 1,225 Purchased surface water 0 0 0
Barona North Chula Vista 1,171 Groundwater 0 0 0
La Jolla Eastern Oceanside 1,076 Groundwater 0 0 0
Rancho Pauma Mutual WC Outside cities and towns 899 Groundwater 0 0 0
Descanso Community Water District Descanso 870 Groundwater 6 0 0
MHC TT Inc. (Dba Pio Pico) Outside cities and towns 828 Groundwater 0 0 0
Yuima Municipal Water District Ida Outside cities and towns 769 Purchased surface water 0 0 0
Pine Hills Mutual Water Company Outside cities and towns 760 Groundwater 2 0 0
San Pasqual District B Outside cities and towns 705 Purchased surface water 0 0 0
Lake Morena's Oak Shores MWC Campo 670 Groundwater 1 2 0
Jacumba Community SD Jacumba 561 Groundwater 0 0 0
Campo Hills-County Public Works Wastewtr Campo 500 Groundwater under direct influence 0 0 0
Warner Springs Estates Outside cities and towns 448 Groundwater 0 0 0
Campo Church Road System (Hud Homes) Mount Laguna 400 Groundwater 4 0 0
Twin Lakes Resort Potrero 400 Groundwater 31 1 0
Pala South Pala 360 Groundwater 5 0 0
Lake Morena Views MWC Campo 360 Groundwater 21 0 0
Yuima Municipal Water District Outside cities and towns 360 Purchased surface water 1 0 0
Butterfield Ranch Outside cities and towns 353 Groundwater 4 2 0
Del Dios Mutual Water Company Del Dios 330 Purchased surface water 1 0 0
Santa Ysabel Main Outside cities and towns 325 Groundwater 5 0 0
Live Oak Springs Water System Outside cities and towns 317 Groundwater 0 2 0
Rincon Paradise Creek Outside cities and towns 305 Groundwater 0 0 0
Barrett Lake MH and RV LLC Outside cities and towns 300 Groundwater 4 0 0
Heavenly Oaks Outside cities and towns 300 Groundwater 0 1 0
San Pasqual Academy Outside cities and towns 298 Groundwater 0 0 0
North Peak Mutual Water Company Outside cities and towns 298 Groundwater 0 0 0
La Jolla Western Oceanside 296 Groundwater 0 0 0
Rancho Del Campo Water System Campo 290 Groundwater 0 0 0
Oakvale Park Outside cities and towns 260 Groundwater 2 0 0
Pine Valley Bible Conference Center Pine Valley 255 Groundwater 0 0 0
Lake Wohlford Resort Outside cities and towns 250 Surface water 1 0 0
Los Tules Mutual Water Company Outside cities and towns 238 Groundwater 0 0 0
Rancho Estates Mutual Water Co. Outside cities and towns 200 Groundwater 6 0 0
Pine Valley Trailer Park Outside cities and towns 200 Groundwater 0 0 0
Palomar Mountain Mutual Water Co. Outside cities and towns 193 Groundwater 0 0 0
Pauma Valley Water Company Outside cities and towns 185 Groundwater 49 0 0
Alpine Oaks Estates LLC Alpine 185 Groundwater 0 0 0
Sunrise Estates Mutual Water Company Outside cities and towns 150 Groundwater 0 1 0
Lazy H Mutual Water Company Outside cities and towns 142 Groundwater 0 0 0
Wynola Water District Outside cities and towns 140 Groundwater 0 2 0
Quiet Oaks Mobile Home Park Outside cities and towns 120 Groundwater 38 0 0
Los Coyotes Outside cities and towns 114 Groundwater 5 0 0
Old Campo Campo 102 Groundwater 0 0 0
Rancho Santa Teresa MW Co. Outside cities and towns 102 Groundwater 18 0 0
Laguna Mountain Mutual Water Co. Mount Laguna 100 Groundwater 0 0 0
Guatay Mutual Benefit Corporation Pine Valley 100 Groundwater 46 0 0
Willowside Terrace Water Association Alpine 100 Groundwater 9 2 0
Ocotillo Oasis, LLC Outside cities and towns 96 Groundwater 13 0 0
H & J Water Company Outside cities and towns 86 Groundwater 0 0 0
Mesa Grande - Black Canyon Outside cities and towns 81 Groundwater 1 1 0
Camp Stevens Julian 78 Groundwater 0 0 0
Arviso - Mobile Home Park Oceanside 70 Groundwater 1 4 0
La Cima Fire Center Outside cities and towns 60 Groundwater 0 0 0
Richardson Beardsley Park Inc. Outside cities and towns 28 Groundwater 0 0 0
Puerta La Cruz CC #14 Outside cities and towns 27 Groundwater 0 0 0
San Diego County Water Authority Oceanside, Chula Vista and 5 more Not reported Surface water 1 0 0

Systems placed by mailing address or county record in San Diego County

13 systems

EPA has no service area map for these systems. They are placed by mailing address or by the county their records name, and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Palomar Christian Conference Center County on record 13,050 Groundwater 0 0 0
Indian Hills Camp County on record 13,032 Groundwater 10 0 0
Pauma Mailing address only 5,700 Groundwater 0 0 0
Naval Medical Center San Diego County on record 2,981 Purchased surface water 0 0 No inventory
YMCA Camp Marston/Raintree County on record 338 Groundwater 1 0 0
La Posta Upper County on record 73 Groundwater 4 0 0
Turner Trailer Park Mailing address in Valley Center 70 Purchased groundwater 1 4 0
Muro Trailer Park Mailing address in Pala 68 Groundwater 0 0 No inventory
South Campo County on record 63 Groundwater 0 0 0
La Posta Lower Community County on record 60 Groundwater 0 0 0
San Felipe Water System Mailing address only 52 Groundwater 0 0 0
Duro Water System Mailing address in Valley Center 35 Groundwater 0 0 0
Carlsbad Desalination Plant County on record Not reported Surface water 0 0 0

Cities and towns in San Diego County

56 places

Back to California

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations