Tapcensus

Water quality in Lake Mathews, California

Lake Mathews is in Riverside County. 198 active public water systems serve the county; 66 had an EPA violation in the past three years.

Most likely your provider

Western Mwd CA3310049 · Community water system · Surface water purchased
Serves 87,955 people Rules violated, past 3 years 0 Last sanitary survey Apr 16, 2026 Distance 0.8 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 Riverside County

93 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Glen Eden Sun Club
 560 0 7.5 mi
Temescal Valley Water District
 22,268 1 7.7 mi
Riverside, City of
Riverside		 302,776 0 8.4 mi
Box Springs Mutual WC
 3,382 1 8.5 mi
Glen Ivy Hot Springs
 32 1 8.8 mi
Home Gardens County WD
 3,095 0 9.5 mi
Elsinore Valley Mwd
 169,455 0 10.9 mi
Corona, City of
Corona		 169,380 6 11.5 mi
Rubidoux Community SD
 38,522 1 12.4 mi
Norco, City of
Norco		 25,068 5 12.5 mi
Nuevo Water Company
 6,733 0 13.4 mi
California Rehabilitation Center Norco
 750 0 13.7 mi
Santa Ana River Water Company
 6,475 0 14.0 mi
Jurupa Community SD
 134,638 0 14.3 mi
Reche Canyon Mutual Water Co.
 150 0 14.5 mi
Ortega Oaks RV Park&campground
 180 2 15.0 mi
Farm Mutual W.c. (the)
 4,026 1 15.6 mi
Eastern Municipal WD
 659,923 0 16.7 mi
Fisherman's Retreat
 352 1 18.5 mi
Rancho Carrillo Mwc
 210 0 19.5 mi
Western Mwd Murrieta Division
 17,837 0 20.8 mi
Plantation on the Lake Park
 885 0 21.5 mi
Rancho Calimesa Mobile Home Park
 296 0 21.6 mi
Sharondale Mesa HOA
 340 3 21.7 mi
Golden Era Productions
 500 0 21.9 mi
All 94 community water systems in Riverside County
Non-community systems in Riverside County (104: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Maverik Fueling Station
Riverside 		129 0 0
Grace Korean Church
 50 0 0
Elsinore Hills RV Park
 45 0 0
Hidden Valley Nature Center
 1,210 0 0
Goose Creek Golf Club
 28 0 0
Morongo Golf Course at Tukwet Cnyn
 185 0 0
Cherry Valley Ranch LLC
 135 0 0
Country Hills RV Park
 415 0 0
Diamond Valley Market Water
 2,195 1 0
Tucalota Springs R.v. Park
 208 0 0
Vista Grande Station Usfs
 30 2 1
Temecula/vail Lake KOA
 1,123 0 0
Kkottongnae Retreat Camp
 79 0 0
Twin Pines Boys Ranch
 30 0 0
Desert Sage Youth Wellness Center
Hemet 		70 0 0
Lake Fulmor Usfs
 125 0 0
Dripping Springs Cg Usfs
 65 0 0
Sundance Meadows
 73 0 0
Cottonwood School
 202 0 0
Lawler Park Riv.county Parks
 26 1 0
MT San Jacinto ST Park (stone Creek)
 150 0 0
Alhatti Christian Mountain Res
 40 0 0
Azalea Trails Girl Scouts Camp
 50 0 0
Marion Mtn/ Fern Basin Usfs
 40 0 0
McCall Park Riv.county Parks
 53 1 0
Stagecoach Inn
 1,006 0 0
Idyllwild Pines Camp
 85 0 0
Chapel in the Pines
 80 0 0
Camp Maranatha
 83 1 0
Keenwild Station Usfs
 30 1 0
Tahquitz Pines
 59 0 0
Jojoba Hills Skp Resort, Inc.
 912 1 1
Elim Foolish Pleasure
 104 0 0
Hurkey Creek Riv. Co. Parks
 756 1 0
Camp Ronald McDonald for G.t.
 202 0 0
Cahuilla Mountain Market & Cafe
 57 1 0
Pine Springs Ranch
 68 1 0
Whitewater Preserve
 503 0 0
C21 Anza
 66 0 0
Palm Springs Aerial Tramway
 1,530 0 0
Anza Petroleum INC
 115 1 1
LA Cocina
 24,524 0 0
LA Plata Water System
 60 0 0
Hamilton School
 705 0 0
Mission Creek Preserve
 33 0 0
Spartan Veterinary Services
 700 1 0
Valley Auto Water
 5,215 0 0
Anza Baptist Church
 80 0 0
Camp Joe Scherman
 105 0 0
Terwilliger Association
 2,401 0 0
All non-community systems
About this data

Water systems are matched to Riverside County, nearest to Lake Mathews 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 or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.

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.