Water Quality in Napa, CA (94559)
EPA violation data for public water systems serving ZIP code 94559.
Active Health Violations
3 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 79% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
27,714
Population
25
Water Systems
20
Violations (5yr)
3
Health-Based
Location
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Water Systems Serving This Area (25)
Napa, City Of
American Canyon, City Of
Phelps Vineyards
Veterans Home Of California
1 health-basedBerryessa Highlands
All resolvedDomaine Carneros
Csp-Bothe-Napa Valley State Park
Berryessa Estates (Lbrid)
Csp - Bale Grist Mill State Historic Par
Luchessi Water Company
Skyline Park
All resolvedSilverfork Mutual Water
Saintsbury Winery
All resolvedMont St. John Cellars
Napa River Ranch
2 health-basedNapa County Animal Shelter
Napa Valley Marina
All resolvedSoda Canyon Store
All resolvedHudson Vineyards Winery Water System
Bouchaine Vineyards
All resolvedCarneros Inn
Culinary Institute Of America
Strack W.D. Water
Cuvaison Carneros
All resolvedCamp Berryessa
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
At high levels, nitrate can cause blue baby syndrome in infants.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Annual water quality report delivery requirement.
Lead & Copper Levels
Lead (Pb)
Approaching limitSampled: Jul 2024
How Does This Compare?
Napa (94559) has more violations than 79% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 20.
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
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) 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.