Tapcensus

Water quality in Harmony Grove, California

Harmony Grove is in San Diego County. 198 active public water systems serve the county; 83 had an EPA violation in the past three years.

Most likely your provider

Rincon del Diablo Mwd (id-1) CA3710018 · Community water system · Surface water purchased
Serves 28,427 people Rules violated, past 3 years 0 Last sanitary survey Nov 25, 2025 Distance 1.7 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in San Diego County

81 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Del Dios Mutual Water Company
 330 3 2.2 mi
Vallecitos WD
 114,700 1 4.3 mi
Olivenhain Mwd
 86,458 0 4.7 mi
Escondido, City of
Escondido		 137,044 0 5.1 mi
Rincon del Diablo Mwd (id-A)
 5,016 0 5.7 mi
Santa FE I.d.
 21,539 0 7.8 mi
Vista Irrigation District
 134,501 0 8.1 mi
San Dieguito WD
 40,405 1 9.1 mi
Carlsbad Mwd
 96,371 0 9.2 mi
Oakvale Park
 260 3 9.4 mi
Lake Wohlford Resort
 250 0 9.7 mi
Poway, City of
Poway		 49,888 0 10.1 mi
San Pasqual Academy
 298 0 11.0 mi
Valley Center Mwd
 30,166 0 11.1 mi
Del Mar, City of
Del Mar		 3,950 0 11.9 mi
Oceanside, City of
Oceanside		 174,340 0 13.1 mi
Ramona Municipal WD
 36,455 0 15.3 mi
Lazy H Mutual Water Company
 117 0 16.3 mi
Rancho Pauma Mutual WC
 899 1 16.4 mi
Rainbow Municipal WD
 23,536 0 16.8 mi
Yuima Municipal Water District Ida
 693 0 17.7 mi
Yuima Municipal Water District
 360 0 17.7 mi
Rancho Estates Mutual Water Co.
 200 0 18.5 mi
San Diego, City of
San Diego		 1,408,937 0 18.5 mi
Pauma Valley Water Company
 185 5 18.9 mi
All 82 community water systems in San Diego County
Non-community systems in San Diego County (116: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Questhaven Municipal Water District
 81 2 0
Hodges Reservoir Recreation Area
 200 0 0
Daley Ranch
 200 0 0
San Pasqual Battlefield State Park
 44 0 0
Bandy Canyon Ranch Corp
 3,564 0 0
Sycamore Canyon / Goodan Ranch
 50 0 0
Oak Knoll Village
 66 1 0
Ramona Oaks RV Resort
 250 4 0
Oakoasis Open Space Preserve
 25 1 0
Sutherland Reservoir Recreation Area
 300 1 0
Palomar Mtn. SP Silvercrest
 143 0 0
Palomar Mtn. SP Doane Valley
 131 0 0
Rey River Ranch Corp.
 12 0 0
Yoga Center Mother's Kitchen
 101 0 0
Yoga Center Retreat
 201 0 0
Santa Margarita County Preserve
 75 0 0
Camp Denver Fox
 86 1 1
EL Monte County Park
 100 0 0
Fry Creek / Observatory
 660 0 0
The Oaks Venture, LLC
 220 0 0
San Diego Mountain Lodge
 26,641 3 0
City of San Diego EL Capitan Reservoir
 300 0 0
Auerbach Farms
 68 0 0
Fallbrook Kamp Retreat
 24 0 0
Santa Ysabel Nature Center
San Diego 		248 0 0
Oak Grove Complex
 68 0 0
Spencer Valley School District
 40 2 0
Apple Water IS Good
 25 1 0
Calvary Chapel Julian
 101 1 0
Mataguay Scout Reservation
 4,000 1 0
Camp Winacka
 250 0 0
Alpine American Legion
 100 1 0
Sacred Mountain Inn
 30 1 0
Warner Unified School District
 250 1 0
Warner Springs Ranch Resort LLC
 32 2 1
Camp Cedar Glen
 65 1 0
Jess Martin County Park
 150 1 0
Julian Oaks Camp
 72 0 0
William Heise County Park
 850 1 0
Nickel Beer Water Company
San Diego 		100 0 0
Diamond Jack's RV Ranch
 115 1 1
Skyline Ranch RV Park & Campground
 45 0 0
Pinecrest
 70 0 0
Whispering Winds Catholic Conference Cen
 164 0 0
Cuyamaca SP Paso Picacho
 691 0 0
Pinezanita Inc.
 400 0 0
KQ Ranch Resort
 400 0 0
Descanso Fire Station
 34 0 0
All Saints Retreat and Formation Center
 72 2 1
Descanso Junction
 100 1 0
All non-community systems
About this data

Water systems are matched to San Diego County, nearest to Harmony Grove first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.