Cottonwood, CA tap water
Supplied by Cottonwood Water District. Here's what its water means for your fish.
Disinfectant
Not confirmed
We couldn't confirm how your water is disinfected. US utilities use chlorine or chloramine, and chloramine doesn't gas off when water sits out.
Safety for fish and shrimp
Nitrate (NO₃)
0.2–6.9 ppm (Low)
Typical 2.7 ppm
Low, so water changes lower your tank's nitrate well.
From California Water Board lab results, measured before treatment (2024–2026).
Copper at home taps
0.05 ppm (Low)
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2025).
Water chemistry
General hardness
38–69 ppm
Typical 61 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)
86–94 ppm
Typical 90 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2024).
pH
7.2–8.2
Typical 7.3
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
130–149 ppm
Typical 144 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 Cottonwood, CA
Cottonwood Water District
Serves 77% of residents · Groundwater (wells) · Disinfectant not listed
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.
Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.
Compiled by Shoal & Stem from public records. Free to cite with a link.