Water Quality in Hollister, CA (95045)
EPA violation data for public water systems serving ZIP code 95045.
Active Health Violations
9 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 76% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
3,659
Population
29
Water Systems
19
Violations (5yr)
9
Health-Based
Location
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Water Systems Serving This Area (29)
Hollister, City Of
1 health-basedSunnyslope County Water Dist
Nps Lassen Volcanic Np
33rd District Agricultural Association
Henry Coe Park Rabbit Spring
San Juan Bautista, City Of
1 health-basedHenry Coe Park Widow Hobb Spr
Hollister Hills-Sheep Springs
Taylor Farms Retail, Inc.
Fremont Peak S.P Cold Spring
Csp Henry W. Coe State Park
Henry Coe Park Bl Oak Spring
True Leaf Farms, Llc.
All resolvedAnzar High School
Henry Coe Park Lost Spring
Hollister Hills-Lodge Well
Mcalpine Lake & Park
1 health-basedMission Farm R.V. Park
1 health-basedWillis Construction Ws
1 health-basedSt. Francis Retreat Center
3 health-basedEnza Zaden Research
All resolvedHenry W Coe State Park Hdqtrs
Henry W Coe State Park - Dowdy Ranch
Betabel Rv Resort
1 health-basedOrchard Acres Subdivision
Mission Vineyard Mobile Home
Los Madrones Mwc
Hollister Hills Svra-Hdq Well
Los Madrones Mutual Water Co
Contaminants Found
A naturally occurring element that can cause cancer and other health effects at high levels.
Missed testing deadlines — not a detection of bacteria.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
Hollister (95045) has more violations than 76% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 19.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.