Tapcensus

Water quality for ZIP code 91010

ZIP 91010 covers Duarte, Irwindale, Azusa, South Monrovia Island, and Bradbury in Los Angeles County, California, one of 295 ZIP codes in the county. 271 active public water systems serve the county; 66 had an EPA violation in the past three years.

Most likely your provider

Cal-Am Water Company Duarte CA1910186 · Community water system · Ground water
Serves 24,767 people Rules violated, past 3 years 0 Last sanitary survey Feb 20, 2025 Distance 0.6 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
Monrovia-City, Water Dept.
Monrovia		 37,931 0 2.6 mi
Valley County Water Dist.
 68,871 0 3.0 mi
Azusa Light and Water
 110,044 0 3.1 mi
Valley View Mutual Water Co.
 4,613 0 3.8 mi
Hemlock Mutual Water Co.
 686 2 4.2 mi
Gswc-South Arcadia
 27,430 0 4.4 mi
City of Arcadia
Arcadia		 54,236 0 4.6 mi
Suburban Water Systems-Glendora
 5,301 0 4.8 mi
Sterling Mutual Water Company
 198 2 5.3 mi
Sierra Madre-City, Water Dept.
Sierra Madre		 11,000 0 5.6 mi
Covina-City, Water Dept.
Covina		 33,300 0 5.9 mi
Glendora-City, Water Dept.
Glendora		 44,411 0 6.2 mi
Cal-Am Water Company East Pasadena
 9,963 0 6.3 mi
EL Monte-City, Water Dept.
El Monte		 23,000 0 6.6 mi
Covina Valley Water Company Wholesale
 0 0 6.8 mi
Sunny Slope Water Co.
 25,252 1 7.0 mi
Suburban Water Systems-Covina Knolls
 1,451 0 7.3 mi
Suburban Water Systems-San Jose
 170,523 0 7.3 mi
Del Rio Mutual
 700 1 7.5 mi
Kinneloa Irrigation Dist.
 1,808 1 7.6 mi
Valencia Heights Water Co.
 7,775 0 7.6 mi
City of Industry Waterworks Systems
La Puente		 6,151 0 7.7 mi
Cal/am Water Company San Marino
 48,065 0 8.0 mi
Gswc-San Dimas
 56,564 0 8.2 mi
LA Puente Valley Cwd
 8,276 0 8.3 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
Usfs-Chantry Flats-A16 Water
 113 0 0
Henninger Flats
 50 0 0
Usfs-Skyline Park / Mount Wilson A-4
 25 0 0
Usfs-Red Box Station A-3
 25 0 0
Millard Canyon Improvement Association
 42 1 0
Coldbrook Campground
 38 0 0
Colby Ranch-United Methodist Camp
 180 0 0
Usfs-Chilao Main A-9
 50 0 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
Angeles Crest Christian Camp
 112 1 0
Clear Creek Outdoor Education Center
 105 0 0
Young-Nak Presbyterian Church
 25 0 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Plant Water Well Rockview Dairy
South Gate 		45 0 0
Rancho los Amigos Hospital
 3,200 0 0
Huttopia Paradise Springs
 302 1 0
Rancho Ybarra Christian Camp
 73 0 0
Camp Elk
 121 0 0
Usfs-Jackson Lake V-4
 805 0 0
Usfs-Valyermo Ranger Station
 25 1 1
Usfs-Appletree Flats V-3
 25 0 0
Saint Andrews Abbey
 210 1 1
Mountain High East Ski Area
 150 0 0
Mount Kare Camp/kare Youth League
 59 0 0
Usfs-Big Pines V-2
 54 0 0
1000 Trails / Soledad Canyon Preserve
 812 1 0
Angeles Shooting Ranges
 490 0 0
Acton Four Square Church
 50 0 0
Acton-Agua Dulce Lds Church
 150 0 0
Acton la North KOA
 400 0 0
Acton Conservation Camp #11
 90 4 0
Vasquez Rocks County Park
 30 0 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
Desert Aire Golf Course
 80 0 0
Agua Dulce Water System
 493 0 0
Agua Dulce Winery
 113 0 0
Los Angeles World Airports
 180 0 0
Living Springs Church
 50 0 0
Shepherd of the Hills
 80 0 0
General Atomics Aeronautical Gray Butt
 405 0 0
Lockheed Martin Skunk Works
 135 0 0
LE Chene Restaurant Water System
 100 0 0
Northrop Grumman Corp.
 5,764 1 0
Antelope Valley Indian Museum State Park
 506 0 0
Lancaster National Soccer Center
Lancaster 		500 0 0
All non-community systems
About this data

Water systems are matched to Los Angeles County, the county this ZIP code lies in, nearest to the ZIP code's centre 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.

ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.