Water Quality in Napa, CA (94508)
EPA violation data for public water systems serving ZIP code 94508.
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 68% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
3,495
Population
19
Water Systems
11
Violations (5yr)
4
Health-Based
Location
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Water Systems Serving This Area (19)
Napa, City Of
American Canyon, City Of
Phelps Vineyards
Pacific Union College
Pacific Union College
Howell Mountain Mutual Water Company
2 health-basedHowell Mountain School
Albion Field Station
Howell Mountain School
1 health-basedLinda Vista Mutual Water Co
Woolls Ranch Winery
All resolvedLa Tierra Heights Mutual
1 health-basedLinda Falls Terrace Mutual
Outpost Wines
All resolvedOdette Estate Water System
Las Posadas 4-H Camp
O'Shaughnessy Winery
All resolvedMending Wall Winery
Cade Winery
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2024
How Does This Compare?
Napa (94508) has more violations than 68% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 11.
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.