Tapcensus

Water quality for ZIP code 95123

ZIP 95123 covers San Jose 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

Great Oaks WC INC CA4310022 · Community water system · Ground water
Serves 112,582 people Rules violated, past 3 years 0 Last sanitary survey Nov 6, 2025 Distance 3.2 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
Muriel Wright Residential Center
 52 0 3.2 mi
City of San Jose Evg/edv/coy
San Jose		 99,783 0 4.0 mi
San Jose Water
 1,039,920 0 5.7 mi
Kennon Water Company
 142 1 6.0 mi
Aborn Heights Water Mutual Association
 45 1 6.8 mi
Mireval Improvement Association
 60 1 7.1 mi
Mt. Pleasant Water Users Association
 300 0 7.4 mi
Coyote Valley RV Resort
 500 0 7.5 mi
Sullivan Mutual Water
 53 2 7.5 mi
Santa Clara Valley Water District
 0 0 7.5 mi
Santa Teresa Meadows Water Company
 68 0 7.7 mi
Parkway Lakes RV Park
 250 1 8.8 mi
Three Springs Ranch Mutual Water Company
 110 0 8.9 mi
Lupin Lodge
 300 2 9.4 mi
Aldercroft Heights County Water District
 338 0 9.5 mi
Vista Grande Water Users Association
 79 0 9.6 mi
Roseview Heights Mutual Water Company
 148 1 9.6 mi
Oakmont Water System
 61 0 9.8 mi
Chemeketa Park Mutual Water Company
 346 1 10.0 mi
Raineri Mutual Water Company
 145 1 10.0 mi
Lake Canyon Mutual Water Company
 156 1 10.3 mi
Mountain Springs Mutual Water Company
 40 0 10.4 mi
Brush and Old Well Mutual Water Company
 70 1 10.5 mi
Melody Woods Water Company
 168 3 10.5 mi
City of Santa Clara
Santa Clara		 134,587 0 11.2 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
Western Digital Technologies, Inc.
 2,439 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
Santa Clara Valley Medical Center
 3,000 3 2
Coyote Creek Golf Club
 101 0 0
O'connor Hospital
 2,500 2 1
Monterey Mushrooms
 361 1 1
Hkn LLC
 50 1 1
Mt. Hamilton Grandview Restaurant
 181 0 0
Coyote Valley Sporting Clays
 27 1 1
Joseph Grant County Park
 322 1 0
Nestldown Ranch
 265 0 0
Loma Prieta Jusd-Loma Prieta School
 542 0 0
Willow Heights Mansion
 269 0 0
Alma Latter-Day Saints Church
 25 2 1
Lakeside Sd-Lakeside School
 127 1 0
Sveadal Water System
 111 0 0
Uvas Canyon County Park
 512 0 0
Walden West
 273 0 0
Saratoga Springs, Inc.
 180 0 0
Sanborn-Skyline County Park
 414 0 0
Morgan Hill Usd-Machado School
 60 0 0
Economy Inn
 52 1 0
George Chiala Farms INC
 150 0 0
Newby Island Landfill, Republic Services
 65 0 0
EL Camino Hospital
 2,000 0 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
The Rainbow Junction Water System
 50 2 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
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, 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.