Tapcensus

Water quality in Pomona, California

Pomona 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

Pomona City, Water Dept. CA1910126 · Community water system · Surface water · Pomona
Serves 151,713 people Rules violated, past 3 years 0 Distance under 0.1 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
Three Valleys Mwd
 0 0 3.2 mi
Calif State Polytechnical Univ Pomona
 2,668 2 3.5 mi
Gswc-San Dimas
 56,564 0 4.6 mi
Gswc Claremont
 39,776 0 4.6 mi
Metropolitan Water Dist. of So. Cal.
 0 0 4.7 mi
LA Verne, City WD
La Verne		 31,334 0 4.8 mi
Walnut Valley Water District
 100,941 0 5.5 mi
Suburban Water Systems-Covina Knolls
 1,451 0 5.6 mi
Covina Valley Water Company Wholesale
 0 0 5.9 mi
Valencia Heights Water Co.
 7,775 0 6.2 mi
Covina-City, Water Dept.
Covina		 33,300 0 7.1 mi
Glendora-City, Water Dept.
Glendora		 44,411 0 7.4 mi
Suburban Water Systems-Glendora
 5,301 0 8.0 mi
Suburban Water Systems-San Jose
 170,523 0 9.5 mi
Azusa Light and Water
 110,044 0 9.6 mi
Rowland Water District
 56,100 0 10.1 mi
LA Puente Valley Cwd
 8,276 0 11.2 mi
Valley County Water Dist.
 68,871 0 11.7 mi
City of Industry Waterworks Systems
La Puente		 6,151 0 12.0 mi
Camp Williams-Resort Water
 80 0 12.2 mi
The River Community
 35 2 12.3 mi
Valley View Mutual Water Co.
 4,613 0 12.6 mi
Cal-Am Water Company Duarte
 24,767 0 12.8 mi
LA Habra Heights Cwd
 5,682 0 12.9 mi
Hemlock Mutual Water Co.
 686 2 14.3 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
Martin Marietta Southern Calif Aggregate
 51 0 0
Coldbrook Campground
 38 0 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
Usfs-Chantry Flats-A16 Water
 113 0 0
Usfs-Skyline Park / Mount Wilson A-4
 25 0 0
Henninger Flats
 50 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-Jackson Lake V-4
 805 0 0
Usfs-Appletree Flats V-3
 25 0 0
Usfs-Chilao Main A-9
 50 0 0
Huttopia Paradise Springs
 302 1 0
Angeles Crest Christian Camp
 112 1 0
Usfs-Red Box Station A-3
 25 0 0
Camp Elk
 121 0 0
Plant Water Well Rockview Dairy
South Gate 		45 0 0
Millard Canyon Improvement Association
 42 1 0
Rancho los Amigos Hospital
 3,200 0 0
Colby Ranch-United Methodist Camp
 180 0 0
Young-Nak Presbyterian Church
 25 0 0
Usfs-Valyermo Ranger Station
 25 1 1
Clear Creek Outdoor Education Center
 105 0 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Saint Andrews Abbey
 210 1 1
Rancho Ybarra Christian Camp
 73 0 0
General Atomics Aeronautical Gray Butt
 405 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
Angeles Shooting Ranges
 490 0 0
Acton la North KOA
 400 0 0
Acton Conservation Camp #11
 90 4 0
Desert Aire Golf Course
 80 0 0
Antelope Valley Indian Museum State Park
 506 0 0
Los Angeles World Airports
 180 0 0
Lockheed Martin Skunk Works
 135 0 0
Vasquez Rocks County Park
 30 0 0
Northrop Grumman Corp.
 5,764 1 0
Ilead Agua Dulce Charter School
 450 1 1
Agua Dulce Women's Club
 50 0 0
Lang Ranch Shopping Center
 28 0 0
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
Lancaster National Soccer Center
Lancaster 		500 0 0
LE Chene Restaurant Water System
 100 0 0
All non-community systems
About this data

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