Water Quality in San Jose, CA (95004)
EPA violation data for public water systems serving ZIP code 95004.
Active Health Violations
4 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 67% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
4,363
Population
27
Water Systems
10
Violations (5yr)
4
Health-Based
Location
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Water Systems Serving This Area (27)
Cwsc Salinas
Cal Am Water Company - Monterey
Alco Water Service
Marina Coast Water District
Hollister, City Of
1 health-basedSunnyslope County Water Dist
Nps Lassen Volcanic Np
33rd District Agricultural Association
Henry Coe Park Rabbit Spring
Aromas Water District
Fireclay Tile
All resolvedLomas Del Sol Mws
Los Carneros Mwa
Rod Mclellan Botanicals Ws
1 health-basedOakridge Subdivision Mwc**Closed**
Murphy Hill Ws #02
1 health-basedPioneer Place Mws
River Oaks R.V.P.
Ballantree Estates Ws
San Juan Rd Ws #01
Julio Honorio
Aromas Hills Mutual Water Association
1 health-basedAromas Beacon Ws
Aromas Hills Mutual Water Co
Los Coches Water System
Cole Rd Mwc
Monterey Vacation R.V. Park
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Used to disinfect water — generally safe at regulated levels.
Missed testing deadlines — not a detection of bacteria.
Lead & Copper Levels
Lead (Pb)
Exceeds limitSampled: Jul 2025
Copper (Cu)
Exceeds limitSampled: Jul 2022
How Does This Compare?
San Jose (95004) has more violations than 67% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 10.
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.