Tapcensus

Water quality in Willowbrook, California

Willowbrook 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 Willowbrook CA1910072 · Community water system · Surface water purchased
Serves 10,793 people Rules violated, past 3 years 0 Distance 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
Suburban Water Systems Sativa
 4,372 0 0.8 mi
Lynwood Park Mutual Water Co.
 1,564 1 0.8 mi
Liberty Utilities Compton
 26,316 0 1.4 mi
Compton-City, Water Dept.
Compton		 90,986 0 1.9 mi
Lynwood-City, Water Dept.
Lynwood		 66,967 0 2.0 mi
Liberty Utilities Lynwood
 24,649 0 2.8 mi
South Gate-City, Water Dept.
South Gate		 88,544 0 2.9 mi
Gswc Florence/graham
 63,472 0 3.4 mi
Walnut Park Mutual Water Co.
 16,180 1 3.4 mi
Tract 349 Mutual Water Co.
 8,700 0 4.0 mi
Gswc Hollydale
 8,099 0 4.1 mi
Huntington Park-City, Water Dept.
Huntington Park		 15,437 0 4.2 mi
Paramount City, Water Dept.
Paramount		 55,200 0 4.4 mi
Tract 180 Mutual Water Co.
 14,000 1 4.4 mi
Gswc Southwest
 277,740 0 4.6 mi
Gswc Bell, Bell Gardens
 55,050 0 5.0 mi
Maywood Mutual Water Co. #1
 3,851 0 5.1 mi
Maywood Mutual Water Co. #3
 6,059 0 5.4 mi
Maywood Mutual Water Co. #2
 6,349 0 5.4 mi
Vernon-City, Water Dept.
Vernon		 28,112 0 5.8 mi
California Water Service Co. Dominguez
 149,490 0 6.0 mi
Bellflower Home Garden Water Company
 1,129 1 6.2 mi
Downey City, Water Dept.
Downey		 110,556 0 6.2 mi
City of Bell Gardens
Bell Gardens		 11,413 0 6.2 mi
Hawthorne-City Water Dept.
Hawthorne		 46,039 0 6.3 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
Rancho los Amigos Hospital
 3,200 0 0
Plant Water Well Rockview Dairy
South Gate 		45 0 0
Young-Nak Presbyterian Church
 25 0 0
Martin Marietta Southern Calif Aggregate
 51 0 0
Millard Canyon Improvement Association
 42 1 0
Henninger Flats
 50 0 0
Irwindale Brewery Yard (iby)
 300 0 0
Usfs-Chantry Flats-A16 Water
 113 0 0
Usfs-Red Box Station A-3
 25 0 0
Usfs-Skyline Park / Mount Wilson A-4
 25 0 0
Clear Creek Outdoor Education Center
 105 0 0
Rancho Ybarra Christian Camp
 73 0 0
Colby Ranch-United Methodist Camp
 180 0 0
Angeles Shooting Ranges
 490 0 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Angeles Crest Christian Camp
 112 1 0
Usfs-Chilao Main A-9
 50 0 0
Coldbrook Campground
 38 0 0
Acton la North KOA
 400 0 0
Acton Conservation Camp #11
 90 4 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
1000 Trails / Soledad Canyon Preserve
 812 1 0
Acton Four Square Church
 50 0 0
Acton-Agua Dulce Lds Church
 150 0 0
Vasquez Rocks County Park
 30 0 0
Ilead Agua Dulce Charter School
 450 1 1
Agua Dulce Women's Club
 50 0 0
Wagon Wheel Plaza
 55 1 0
Lang Ranch Shopping Center
 28 0 0
Agua Dulce Water System
 493 0 0
Huttopia Paradise Springs
 302 1 0
Agua Dulce Winery
 113 0 0
LE Chene Restaurant Water System
 100 0 0
Shepherd of the Hills
 80 0 0
Living Springs Church
 50 0 0
Saint Andrews Abbey
 210 1 1
Texas Canyon Ranger Station
 30 0 0
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
Anchor Retreat Center
 202 0 0
Desert Aire Golf Course
 80 0 0
Los Angeles World Airports
 180 0 0
Lockheed Martin Skunk Works
 135 0 0
Northrop Grumman Corp.
 5,764 1 0
Los Angeles, City of Castaic Pwr Plant
 55 0 0
All non-community systems
About this data

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