Tapcensus

Water quality for ZIP code 95023

ZIP 95023 covers Hollister, Ridgemark, and Tres Pinos in San Benito County, California, one of 4 ZIP codes in the county. 64 active public water systems serve the county; 24 had an EPA violation in the past three years.

Most likely your provider

Rosa Morada Mutual Water Company CA3500549 · Community water system · Ground water
Serves 69 people Rules violated, past 3 years 0 Last sanitary survey Feb 27, 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 San Benito County

30 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
McMahon Road Mutual Water Company
 102 0 0.7 mi
Springwood Estates Mwc
 50 0 0.9 mi
Rancho San Joaquin Mwc
 96 3 1.2 mi
Comstock Mutual Water Company
 100 0 2.0 mi
Fallon Road Labor Housing
 84 0 2.1 mi
Whispering Pines Inn
 28 1 2.3 mi
Casa de Fruta Orchards
 53 0 4.0 mi
Hollister, City of
Hollister		 26,598 1 4.1 mi
San Benito County Water District
 0 0 4.4 mi
Dunneville Estates Csa #50
 95 0 4.5 mi
Sunnyslope County Water Dist
 25,486 0 4.8 mi
Mission Oaks Mobile Home Park
 550 0 5.3 mi
Venture Estates Mwc
 50 1 5.7 mi
Valenzuela Water System
 55 1 6.0 mi
Union Heights Mwc
 98 0 6.4 mi
Creekbridge Mutual Water Company
 69 1 6.4 mi
Hollister Ranch Estates
 150 0 6.6 mi
Ashford Highlands Mwc
 132 0 6.9 mi
Csa No. 31 Stonegate WS
 230 1 7.3 mi
San Justo Mutual Water Company
 166 2 7.3 mi
Vineyard Estates Mwc
 90 2 7.6 mi
Tres Pinos Cwd
 350 0 7.7 mi
Mission Farm R.v. Park
 110 1 10.6 mi
Los Madrones Mwc
 39 0 11.0 mi
San Juan Bautista, City of
San Juan Bautista		 2,335 1 11.1 mi
All 31 community water systems in San Benito County
Non-community systems in San Benito County (33: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
B & R Farms
 34 0 0
Hollister Sda Christian School
 122 0 0
George Chiala Farms, Inc..
Hollister 		350 0 0
T & a Onions
 165 0 0
Dunneville Market & Kitchen
 300 0 0
Quintero Labor Camp #1 (wright Rd)
 50 0 0
San Benito High School
 3,310 0 0
Southside Elementary School
 300 0 0
Pacific Scientific Energetic Mats. Comp.
 550 0 0
Villa Robles Water System
 98 3 2
Tri-Cal Incorporated
 35 0 0
Enza Zaden Research
 65 2 0
Csp Hollister Hills Svra
 2,719 0 0
33rd District Agricultural Association
 9,000 0 0
Bayer Research and Development LLC
 35 0 0
St. Francis Retreat Center
 61 1 0
True Leaf Farms, Llc.
 372 1 0
Taylor Farms Retail, Inc.
 1,055 0 0
Anzar High School
 268 0 0
Willis Construction WS
 76 0 0
McAlpine Lake & Park
 31 1 1
Willow Grove Union Elementary School
 25 2 1
Paicines Water System
 50 0 0
Csp-Fremont Peak
 22,217 0 0
Paicines Ranch
 52 2 1
Fireclay Tile
 100 1 0
Pinnacles National Park-West District
 328 0 0
Pinnacles National Park Campground
 647 0 0
Pinnacles National Park-East District
 1,811 1 1
Kingdom Hall (fallon Rd)
 500 0 0
Mohi at the Grove
 500 0 0
Cienega Winery
 50 0 0
San Benito County Historical Park
 25 1 0
About this data

Water systems are matched to San Benito 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.

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.