Yosemite Valley, CA tap water
About 15% of Yosemite Valley is inside a utility's service area. Homes outside it likely use private wells, which no utility tests.
Disinfectant
Chlorine
Utility water here is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it. Private wells aren't treated by a utility, so there's no chlorine or chloramine unless a treatment system adds it.
Safety for fish and shrimp
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results, measured before treatment (2023–2024).
Copper at home taps
Not detected (Low)
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2024).
Water chemistry
General hardness
11–15 ppm
Typical 13 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From California Water Board lab results, measured before treatment (2024).
Carbonate hardness (alkalinity)
17–22 ppm
Typical 20 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From California Water Board lab results, measured before treatment (2024).
pH
7–7.2
Typical 7
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment (2024).
Total dissolved solids
24–52 ppm
Typical 37 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 California Water Board lab results, measured before treatment (2024).
Who supplies Yosemite Valley, CA
Yosemite Nps-Yosemite Valley
Serves 15% of residents · Groundwater (wells) · 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.