Tapcensus

Water quality in Monrovia, California

Monrovia 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

Monrovia-City, Water Dept. CA1910090 · Community water system · Ground water · Monrovia
Serves 37,931 people Rules violated, past 3 years 0 Last sanitary survey Sep 17, 2024 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
Cal-Am Water Company Duarte
 24,767 0 2.7 mi
Sierra Madre-City, Water Dept.
Sierra Madre		 11,000 0 3.4 mi
City of Arcadia
Arcadia		 54,236 0 3.4 mi
Gswc-South Arcadia
 27,430 0 4.5 mi
Hemlock Mutual Water Co.
 686 2 5.0 mi
Valley County Water Dist.
 68,871 0 5.0 mi
Cal-Am Water Company East Pasadena
 9,963 0 5.1 mi
Kinneloa Irrigation Dist.
 1,808 1 5.3 mi
Valley View Mutual Water Co.
 4,613 0 5.4 mi
Azusa Light and Water
 110,044 0 5.7 mi
Sunny Slope Water Co.
 25,252 1 6.1 mi
Sterling Mutual Water Company
 198 2 6.1 mi
EL Monte-City, Water Dept.
El Monte		 23,000 0 7.0 mi
Cal/am Water Company San Marino
 48,065 0 7.1 mi
Suburban Water Systems-Glendora
 5,301 0 7.3 mi
San Gabriel County WD
 40,154 0 7.8 mi
Rubio Canon Land & Water Association
 6,646 0 7.9 mi
Pasadena Water and Power
Pasadena		 165,448 0 8.1 mi
Del Rio Mutual
 700 1 8.4 mi
Las Flores Water Co.
 2,211 0 8.4 mi
Glendora-City, Water Dept.
Glendora		 44,411 0 8.4 mi
Covina-City, Water Dept.
Covina		 33,300 0 8.5 mi
Amarillo Mutual Water Company
 3,134 0 8.6 mi
Covina Valley Water Company Wholesale
 0 0 9.3 mi
Gswc-South San Gabriel
 26,451 0 9.5 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
Usfs-Chantry Flats-A16 Water
 113 0 0
Irwindale Brewery Yard (iby)
 300 0 0
Martin Marietta Southern Calif Aggregate
 51 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
Colby Ranch-United Methodist Camp
 180 0 0
Coldbrook Campground
 38 0 0
Clear Creek Outdoor Education Center
 105 0 0
Angeles Crest Christian Camp
 112 1 0
Usfs-Chilao Main A-9
 50 0 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Young-Nak Presbyterian Church
 25 0 0
Rancho Ybarra Christian Camp
 73 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
Saint Andrews Abbey
 210 1 1
Usfs-Valyermo Ranger Station
 25 1 1
Camp Elk
 121 0 0
Usfs-Jackson Lake V-4
 805 0 0
Usfs-Appletree Flats V-3
 25 0 0
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
Agua Dulce Water System
 493 0 0
Desert Aire Golf Course
 80 0 0
Agua Dulce Winery
 113 0 0
Living Springs Church
 50 0 0
Shepherd of the Hills
 80 0 0
Los Angeles World Airports
 180 0 0
LE Chene Restaurant Water System
 100 0 0
Lockheed Martin Skunk Works
 135 0 0
General Atomics Aeronautical Gray Butt
 405 0 0
Northrop Grumman Corp.
 5,764 1 0
Lancaster National Soccer Center
Lancaster 		500 0 0
Antelope Valley Indian Museum State Park
 506 0 0
All non-community systems
About this data

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