Yountville, CA tap water
Supplied mostly by Town of Yountville, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chlorine
Your water is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it.
Safety for fish and shrimp
Nitrate (NO₃)
Up to 1.3 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results; California Water Board lab results, measured before treatment (2023–2026).
Copper at home taps
0.16 ppm (Worth knowing)
Shrimp and snails are sensitive to copper. Water that sits in household pipes picks up the most; it drops once the tap has run for a minute.
From California Water Board lab results (2023–2025).
Water chemistry
General hardness
Supplier's figure32–148 ppm
Typical 71 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: City of Napa and Veterans Home of California, which supplies Town of Yountville; California Water Board lab results, measured before treatment (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure31–110 ppm
Typical 59 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: City of Napa and Veterans Home of California, which supplies Town of Yountville; California Water Board lab results, measured before treatment (2023–2026).
pH
Supplier's figure7.1–7.3
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: City of Napa and Veterans Home of California, which supplies Town of Yountville; California Water Board lab results, measured before treatment (2023–2026).
Total dissolved solids
Supplier's figure85–221 ppm
Typical 135 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
From the utility that supplies yours: City of Napa and Veterans Home of California, which supplies Town of Yountville; California Water Board lab results, measured before treatment (2023–2026).
- Town of Yountville and Veterans Home of California add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Yountville, CA
Town of Yountville
Serves 79% of residents · Buys water from City of Napa · Chlorine
Veterans Home of California
Serves 23% of residents · Lake or river water · Chlorine
Our data comes from public records and is still incomplete. Many utilities don't publish every number, so we're adding more all the time. Your city's range is a starting point: testing your own tap is the only way to know exactly what's in it.
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Compiled by Shoal & Stem from public records. Free to cite with a link.