Ahwahnee, CA tap water
Supplied mostly by Cal Am - Goldside, plus 4 other utilities. 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 25 ppm (Low)
Typical 1.7 ppm
Low, so water changes lower your tank's nitrate well.
From California Water Board lab results, measured before treatment (2023–2026).
Copper at home taps
Up to 0.32 ppm (Worth knowing)
Typical 0.1 ppm
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
64–310 ppm
Typical 200 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
From California Water Board lab results, measured before treatment; Md 43 Miami Creek Knolls' calcium and magnesium readings, measured before treatment (2023–2026).
Carbonate hardness (alkalinity)
77–145 ppm
Typical 100 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2023–2026).
pH
6.7–7.7
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 (2023–2026).
Total dissolved solids
143–950 ppm
Typical 715 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; Pike Ranch Mutual Water Co's conductivity readings, measured before treatment (2023–2026).
Who supplies Ahwahnee, CA
Cal Am - Goldside
Serves 62% of residents · Groundwater (wells) · Chlorine
Pike Ranch Mutual Water Co
Serves 22% of residents · Groundwater (wells) · Chlorine
Md 60 Dillon Estates
Serves 16% of residents · Groundwater (wells) · Disinfectant not listed
Md 43 Miami Creek Knolls
Serves 8% of residents · Groundwater (wells) · Chlorine
Md 46 Ahwahnee Resorts
Serves 6% 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.