Tapcensus

Water quality for ZIP code 91604

ZIP 91604 covers Los Angeles 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

Los Angeles-City, Dept. of Water & Power CA1910067 · Community water system · Surface water · Los Angeles
Serves 3,875,566 people Rules violated, past 3 years 0 Distance 2.0 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
Beverly Hills-City, Water Dept.
Beverly Hills		 39,922 0 4.3 mi
Burbank-City, Water Dept.
Burbank		 106,146 0 5.1 mi
Glendale-City, Water Dept.
Glendale		 192,212 0 8.8 mi
Gswc Culver City
Santa Fe Springs		 38,233 0 9.3 mi
Santa Monica-City, Water Division
Santa Monica		 90,729 0 9.6 mi
Los Angeles Cwwd 21-Kagel Canyon
 736 0 10.3 mi
Cal/am Water Company Baldwin Hills
 20,724 0 10.4 mi
San Fernando-City, Water Dept.
San Fernando		 23,364 0 10.5 mi
Crescenta Valley Cwd
 28,162 0 10.7 mi
LA Canada Irrigation Dist.
 9,258 0 11.6 mi
Valley Water Co.
 10,113 0 11.9 mi
Inglewood City, Water Dept.
Inglewood		 81,191 0 12.7 mi
Liberty Utilities Mesa Crest
 1,616 0 13.0 mi
Foothill Municipal Water Dist.
 0 2 13.3 mi
City of South Pasadena
South Pasadena		 25,329 0 13.6 mi
Valhalla Water Association
 25 1 13.8 mi
Vernon-City, Water Dept.
Vernon		 28,112 0 14.0 mi
Lincoln Avenue Water Co.
 8,721 0 14.4 mi
Gswc Florence/graham
 63,472 0 14.6 mi
California Water Service Co. Ela
 142,140 0 14.8 mi
Pasadena Water and Power
Pasadena		 165,448 0 14.9 mi
Huntington Park-City, Water Dept.
Huntington Park		 15,437 0 15.0 mi
City of Alhambra
Alhambra		 80,279 0 15.2 mi
Las Flores Water Co.
 2,211 0 15.4 mi
Walnut Park Mutual Water Co.
 16,180 1 15.5 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
Young-Nak Presbyterian Church
 25 0 0
Angeles Shooting Ranges
 490 0 0
Rancho Ybarra Christian Camp
 73 0 0
Millard Canyon Improvement Association
 42 1 0
Clear Creek Outdoor Education Center
 105 0 0
Usfs-Red Box Station A-3
 25 0 0
Henninger Flats
 50 0 0
Plant Water Well Rockview Dairy
South Gate 		45 0 0
Colby Ranch-United Methodist Camp
 180 0 0
Rancho los Amigos Hospital
 3,200 0 0
Usfs-Skyline Park / Mount Wilson A-4
 25 0 0
Usfs-Chantry Flats-A16 Water
 113 0 0
Acton Conservation Camp #11
 90 4 0
Usfs-Monte Cristo Camp T-4
 116 0 0
Acton la North KOA
 400 0 0
Martin Marietta Southern Calif Aggregate
 51 0 0
1000 Trails / Soledad Canyon Preserve
 812 1 0
Ilead Agua Dulce Charter School
 450 1 1
Vasquez Rocks County Park
 30 0 0
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
Acton Four Square Church
 50 0 0
Texas Canyon Ranger Station
 30 0 0
Acton-Agua Dulce Lds Church
 150 0 0
LE Chene Restaurant Water System
 100 0 0
Irwindale Brewery Yard (iby)
 300 0 0
Agua Dulce Winery
 113 0 0
Shepherd of the Hills
 80 0 0
Living Springs Church
 50 0 0
Angeles Crest Christian Camp
 112 1 0
Usfs-Chilao Main A-9
 50 0 0
Anchor Retreat Center
 202 0 0
Coldbrook Campground
 38 0 0
Los Angeles, City of Castaic Pwr Plant
 55 0 0
Usfs-Crystal Lake B-13 Water
 2,000 0 0
Saint Andrews Abbey
 210 1 1
Lockheed Martin Skunk Works
 135 0 0
Camp Verdugo Oaks Boyscouts
 1,500 0 0
Hughes-Elizabeth Lake Unified School Dis
 550 2 1
Desert Aire Golf Course
 80 0 0
Los Angeles World Airports
 180 0 0
Usfs-Valyermo Ranger Station
 25 1 1
Huttopia Paradise Springs
 302 1 0
Northrop Grumman Corp.
 5,764 1 0
Mira Loma High Desert Hospital
 500 0 0
Del Sur School/westside Union District
 825 1 0
Lancaster National Soccer Center
Lancaster 		500 0 0
Camp Elk
 121 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.