Teviston, CA tap water
About 43% of Teviston 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)
13–19 ppm (Worth knowing)
Typical 17 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results, measured before treatment (2023–2025).
Copper at home taps
0.03 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
18–53 ppm
Typical 36 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)
70–72 ppm
Typical 71 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2024).
pH
8.3–8.6
Typical 8.5
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From California Water Board lab results, measured before treatment (2024).
Total dissolved solids
120–210 ppm
Typical 165 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 Teviston, CA
Teviston Community Services District
Serves 43% 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.
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.