Serving roughly 19,412 people in Napa County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for PHELPS VINEYARDS
1 water provider directly on file, serving roughly 19,412 people in Napa County, California.
Quick answer: PHELPS VINEYARDS has no violations on file and no single reading stands out against its peers (358 other providers in this area). It serves roughly 19,412 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Copper, Free
Fluoride
Nitrate
Barium
Arsenic
Chromium, Hex
Utility PHELPS VINEYARDSPopulation served 19,412Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Copper, Free
Detected: 70 UG/L (ppb)
9/25/2025
Barium
Detected: 130 UG/L (ppb)
3/24/2025
Arsenic
Detected: 7.1 UG/L (ppb)
3/24/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Chromium, Hex
Detected: 0.02 UG/L (ppb)
3/24/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 0.11 MG/L (ppm)
3/24/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.35 MG/L (ppm)
8/13/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.