Tapcensus

Water quality in Claremont, California

Claremont is in Los Angeles County. 271 active public water systems serve the county; 66 had an EPA violation in the past three years.

Most likely your provider

Gswc Claremont CA1910024 · Community water system · Surface water purchased
Serves 39,776 people Rules violated, past 3 years 0 Last sanitary survey Jan 15, 2026 Distance 0.8 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 Los Angeles County

198 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
LA Verne, City WD
La Verne		 31,334 0 2.8 mi
Metropolitan Water Dist. of So. Cal.
 0 0 4.3 mi
Pomona City, Water Dept.
Pomona		 151,713 0 5.3 mi
Gswc-San Dimas
 56,564 0 6.6 mi
Three Valleys Mwd
 0 0 7.4 mi
Calif State Polytechnical Univ Pomona
 2,668 2 7.7 mi
Glendora-City, Water Dept.
Glendora		 44,411 0 7.8 mi
Covina Valley Water Company Wholesale
 0 0 8.4 mi
Suburban Water Systems-Covina Knolls
 1,451 0 8.6 mi
Camp Williams-Resort Water
 80 0 8.6 mi
The River Community
 35 2 8.9 mi
Suburban Water Systems-Glendora
 5,301 0 9.3 mi
Covina-City, Water Dept.
Covina		 33,300 0 9.9 mi
Valencia Heights Water Co.
 7,775 0 9.9 mi
Walnut Valley Water District
 100,941 0 10.6 mi
Azusa Light and Water
 110,044 0 11.4 mi
Suburban Water Systems-San Jose
 170,523 0 13.4 mi
Valley County Water Dist.
 68,871 0 14.1 mi
Cal-Am Water Company Duarte
 24,767 0 14.3 mi
Rowland Water District
 56,100 0 15.0 mi
LA Puente Valley Cwd
 8,276 0 15.3 mi
Valley View Mutual Water Co.
 4,613 0 15.3 mi
City of Industry Waterworks Systems
La Puente		 6,151 0 15.9 mi
Monrovia-City, Water Dept.
Monrovia		 37,931 0 16.1 mi
Hemlock Mutual Water Co.
 686 2 16.8 mi
All 199 community water systems in Los Angeles County
Non-community systems in Los Angeles County (72: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Irwindale Brewery Yard (iby)
 300 0 0
Coldbrook Campground
 38 0 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
Martin Marietta Southern Calif Aggregate
 51 0 0
Mount Kare Camp/kare Youth League
 59 0 0
Usfs-Big Pines V-2
 54 0 0
Mountain High East Ski Area
 150 0 0
Usfs-Appletree Flats V-3
 25 0 0
Usfs-Jackson Lake V-4
 805 0 0
Usfs-Chantry Flats-A16 Water
 113 0 0
Camp Elk
 121 0 0
Huttopia Paradise Springs
 302 1 0
Usfs-Skyline Park / Mount Wilson A-4
 25 0 0
Usfs-Chilao Main A-9
 50 0 0
Henninger Flats
 50 0 0
Angeles Crest Christian Camp
 112 1 0
Usfs-Valyermo Ranger Station
 25 1 1
Usfs-Red Box Station A-3
 25 0 0
Saint Andrews Abbey
 210 1 1
Millard Canyon Improvement Association
 42 1 0
Colby Ranch-United Methodist Camp
 180 0 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Clear Creek Outdoor Education Center
 105 0 0
Plant Water Well Rockview Dairy
South Gate 		45 0 0
Rancho los Amigos Hospital
 3,200 0 0
Young-Nak Presbyterian Church
 25 0 0
General Atomics Aeronautical Gray Butt
 405 0 0
Rancho Ybarra Christian Camp
 73 0 0
1000 Trails / Soledad Canyon Preserve
 812 1 0
Acton-Agua Dulce Lds Church
 150 0 0
Acton Four Square Church
 50 0 0
Antelope Valley Indian Museum State Park
 506 0 0
Desert Aire Golf Course
 80 0 0
Acton la North KOA
 400 0 0
Angeles Shooting Ranges
 490 0 0
Acton Conservation Camp #11
 90 4 0
Los Angeles World Airports
 180 0 0
Lockheed Martin Skunk Works
 135 0 0
Northrop Grumman Corp.
 5,764 1 0
Lancaster National Soccer Center
Lancaster 		500 0 0
Vasquez Rocks County Park
 30 0 0
Agua Dulce Women's Club
 50 0 0
Lang Ranch Shopping Center
 28 0 0
Ilead Agua Dulce Charter School
 450 1 1
Wagon Wheel Plaza
 55 1 0
Agua Dulce Water System
 493 0 0
Agua Dulce Winery
 113 0 0
Living Springs Church
 50 0 0
Shepherd of the Hills
 80 0 0
Eastside Union School District
 650 1 1
All non-community systems
About this data

Water systems are matched to Los Angeles County, nearest to Claremont 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.