Tapcensus

Water quality in Cupertino, California

Cupertino 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 Cupertino CA4310018 · Community water system · Surface water purchased · Cupertino
Serves 16,336 people Rules violated, past 3 years 0 Last sanitary survey Feb 5, 2025 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 2.7 mi
Mt. Eden Mutual Water Company
 165 1 3.0 mi
Camp Saratoga
 450 0 4.4 mi
City of Sunnyvale
Sunnyvale		 157,566 5 4.8 mi
Purissima Hills Water District
 6,252 1 5.6 mi
Saratoga Heights Mutual Water Company
 258 0 5.7 mi
City of Mountain View
Mountain View		 81,340 0 6.0 mi
City of Santa Clara
Santa Clara		 134,587 0 6.3 mi
Lee's Orchard Owners Association
Santa Clara		 35 0 6.3 mi
City of Palo Alto
Palo Alto		 67,658 0 6.7 mi
Nasa Ames Research Center
 1,200 0 6.9 mi
San Jose Water
 1,039,920 0 8.8 mi
Lake Canyon Mutual Water Company
 156 1 8.9 mi
Vista Grande Water Users Association
 79 0 9.1 mi
Stanford University
 23,817 0 9.2 mi
Mireval Improvement Association
 60 1 9.5 mi
City of San Jose Nsj/alviso
San Jose		 48,082 0 9.6 mi
Kennon Water Company
 142 1 10.0 mi
Oakmont Water System
 61 0 10.9 mi
Raineri Mutual Water Company
 145 1 11.1 mi
Brush and Old Well Mutual Water Company
 70 1 11.2 mi
Lupin Lodge
 300 2 11.3 mi
Chemeketa Park Mutual Water Company
 346 1 11.8 mi
Aldercroft Heights County Water District
 338 0 12.0 mi
City of Milpitas
Milpitas		 81,915 1 12.2 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
Saratoga Springs, Inc.
 180 0 0
Walden West
 273 0 0
Sanborn-Skyline County Park
 414 0 0
O'connor Hospital
 2,500 2 1
Santa Clara Valley Medical Center
 3,000 3 2
Lakeside Sd-Lakeside School
 127 1 0
Newby Island Landfill, Republic Services
 65 0 0
Nestldown Ranch
 265 0 0
Alma Latter-Day Saints Church
 25 2 1
Loma Prieta Jusd-Loma Prieta School
 542 0 0
Western Digital Technologies, Inc.
 2,439 0 0
Mt. Hamilton Grandview Restaurant
 181 0 0
Calero County Park
 210 0 0
Metcalf Motorcycle County Park
 210 0 0
Field Sports Park/coyote Ranch
 258 0 0
Joseph Grant County Park
 322 1 0
Cinnabar Hills Golf Club
 50 1 1
Coyote Creek Golf Club
 101 0 0
Uvas Canyon County Park
 512 0 0
Sveadal Water System
 111 0 0
Monterey Mushrooms
 361 1 1
Hkn LLC
 50 1 1
Coyote Valley Sporting Clays
 27 1 1
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
Mt. Madonna County Park
 621 0 0
Csp Henry W. Coe State Park
 1,205 0 0
Chitactac-Adams County Park
 156 0 0
San Martin Lions Club
 30 0 0
Scc Animal Shelter/airport
 25 0 0
Fortino Winery
 25 0 0
Learning Services Corp.
 48 0 0
VO UU Buddhist Meditation Association
 33 0 0
Gilroy Usd-Rucker School
 510 0 0
The Rainbow Junction Water System
 50 2 0
Coyote Lake County Park
 216 1 0
Reforestation Technologies International
 34 1 1
Gavilan Joint Community College District
 5,400 0 0
Garlic World
 25 1 0
Pacific Point Christian School
 165 0 0
Christopher Ranch L.l.c.
 735 0 0
Z Best Products
 90 0 0
Henry W Coe State Park Dowdy Ranch
 65 0 0
About this data

Water systems are matched to Santa Clara County, nearest to Cupertino 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.