Tapcensus

Water quality in Sunnyvale, California

Sunnyvale is in Santa Clara County. 119 active public water systems serve the county; 41 had an EPA violation in the past three years.

Most likely your provider

City of Sunnyvale CA4310014 · Community water system · Surface water purchased · Sunnyvale
Serves 157,566 people Rules violated, past 3 years 5 Last sanitary survey Sep 19, 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 Santa Clara County

72 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Cwsc los Altos Suburban
 63,559 0 3.0 mi
City of Santa Clara
Santa Clara		 134,587 0 3.2 mi
Lee's Orchard Owners Association
Santa Clara		 35 0 3.2 mi
Nasa Ames Research Center
 1,200 0 3.2 mi
City of Mountain View
Mountain View		 81,340 0 3.7 mi
City of Cupertino
Cupertino		 16,336 0 4.8 mi
City of San Jose Nsj/alviso
San Jose		 48,082 0 4.8 mi
City of Palo Alto
Palo Alto		 67,658 0 6.8 mi
Purissima Hills Water District
 6,252 1 6.9 mi
Mt. Eden Mutual Water Company
 165 1 7.3 mi
City of Milpitas
Milpitas		 81,915 1 7.8 mi
San Jose Water
 1,039,920 0 8.4 mi
Stanford University
 23,817 0 8.6 mi
Camp Saratoga
 450 0 9.1 mi
Saratoga Heights Mutual Water Company
 258 0 9.7 mi
Spring Valley Heights Association INC
 65 0 10.7 mi
Mireval Improvement Association
 60 1 11.9 mi
Kennon Water Company
 142 1 12.0 mi
Roseview Heights Mutual Water Company
 148 1 12.4 mi
Vista Grande Water Users Association
 79 0 12.4 mi
Lake Canyon Mutual Water Company
 156 1 12.5 mi
Mt. Pleasant Water Users Association
 300 0 14.0 mi
Oakmont Water System
 61 0 14.2 mi
Three Springs Ranch Mutual Water Company
 110 0 14.3 mi
Raineri Mutual Water Company
 145 1 14.5 mi
All 73 community water systems in Santa Clara County
Non-community systems in Santa Clara County (46: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
EL Camino Hospital
 2,000 0 0
O'connor Hospital
 2,500 2 1
Santa Clara Valley Medical Center
 3,000 3 2
Newby Island Landfill, Republic Services
 65 0 0
Saratoga Springs, Inc.
 180 0 0
Walden West
 273 0 0
Sanborn-Skyline County Park
 414 0 0
Lakeside Sd-Lakeside School
 127 1 0
Mt. Hamilton Grandview Restaurant
 181 0 0
Western Digital Technologies, Inc.
 2,439 0 0
Nestldown Ranch
 265 0 0
Alma Latter-Day Saints Church
 25 2 1
Joseph Grant County Park
 322 1 0
Loma Prieta Jusd-Loma Prieta School
 542 0 0
Metcalf Motorcycle County Park
 210 0 0
Field Sports Park/coyote Ranch
 258 0 0
Calero County Park
 210 0 0
Cinnabar Hills Golf Club
 50 1 1
Coyote Creek Golf Club
 101 0 0
Monterey Mushrooms
 361 1 1
Hkn LLC
 50 1 1
Coyote Valley Sporting Clays
 27 1 1
Uvas Canyon County Park
 512 0 0
Sveadal Water System
 111 0 0
Willow Heights Mansion
 269 0 0
Morgan Hill Usd-Machado School
 60 0 0
Economy Inn
 52 1 0
George Chiala Farms INC
 150 0 0
The Rainbow Junction Water System
 50 2 0
Csp Henry W. Coe State Park
 1,205 0 0
Scc Animal Shelter/airport
 25 0 0
San Martin Lions Club
 30 0 0
Chitactac-Adams County Park
 156 0 0
Mt. Madonna County Park
 621 0 0
Learning Services Corp.
 48 0 0
VO UU Buddhist Meditation Association
 33 0 0
Coyote Lake County Park
 216 1 0
Fortino Winery
 25 0 0
Gilroy Usd-Rucker School
 510 0 0
Reforestation Technologies International
 34 1 1
Gavilan Joint Community College District
 5,400 0 0
Pacific Point Christian School
 165 0 0
Garlic World
 25 1 0
Christopher Ranch L.l.c.
 735 0 0
Henry W Coe State Park Dowdy Ranch
 65 0 0
Z Best Products
 90 0 0
About this data

Water systems are matched to Santa Clara County, nearest to Sunnyvale 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. Retrieved from ECHO on Oct 11, 2026.