Tapcensus

Water quality for ZIP code 94303

ZIP 94303 covers Palo Alto, East Palo Alto, and Menlo Park in Santa Clara County, California, one of 58 ZIP codes in the 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 Mountain View CA4310007 · Community water system · Surface water purchased · Mountain View
Serves 81,340 people Rules violated, past 3 years 0 Last sanitary survey Feb 11, 2025 Distance 4.1 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
Stanford University
 23,817 0 3.7 mi
Nasa Ames Research Center
 1,200 0 4.4 mi
City of Palo Alto
Palo Alto		 67,658 0 4.9 mi
Purissima Hills Water District
 6,252 1 6.4 mi
Cwsc los Altos Suburban
 63,559 0 7.4 mi
City of Sunnyvale
Sunnyvale		 157,566 5 7.5 mi
City of San Jose Nsj/alviso
San Jose		 48,082 0 7.9 mi
City of Cupertino
Cupertino		 16,336 0 10.0 mi
Lee's Orchard Owners Association
Santa Clara		 35 0 10.3 mi
City of Santa Clara
Santa Clara		 134,587 0 10.3 mi
City of Milpitas
Milpitas		 81,915 1 12.0 mi
Mt. Eden Mutual Water Company
 165 1 13.0 mi
Camp Saratoga
 450 0 13.9 mi
Spring Valley Heights Association INC
 65 0 14.9 mi
Saratoga Heights Mutual Water Company
 258 0 15.6 mi
San Jose Water
 1,039,920 0 15.8 mi
Roseview Heights Mutual Water Company
 148 1 18.2 mi
Lake Canyon Mutual Water Company
 156 1 18.9 mi
Mireval Improvement Association
 60 1 19.0 mi
Vista Grande Water Users Association
 79 0 19.0 mi
Kennon Water Company
 142 1 19.2 mi
Three Springs Ranch Mutual Water Company
 110 0 20.4 mi
Mt. Pleasant Water Users Association
 300 0 20.5 mi
Oakmont Water System
 61 0 20.8 mi
Raineri Mutual Water Company
 145 1 21.0 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
Newby Island Landfill, Republic Services
 65 0 0
O'connor Hospital
 2,500 2 1
Santa Clara Valley Medical Center
 3,000 3 2
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
Joseph Grant County Park
 322 1 0
Alma Latter-Day Saints Church
 25 2 1
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
The Rainbow Junction Water System
 50 2 0
Morgan Hill Usd-Machado School
 60 0 0
Economy Inn
 52 1 0
Csp Henry W. Coe State Park
 1,205 0 0
George Chiala Farms INC
 150 0 0
Scc Animal Shelter/airport
 25 0 0
San Martin Lions Club
 30 0 0
Mt. Madonna County Park
 621 0 0
Chitactac-Adams County Park
 156 0 0
Coyote Lake County Park
 216 1 0
Learning Services Corp.
 48 0 0
VO UU Buddhist Meditation Association
 33 0 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, 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 or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.

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.