Visalia, CA tap water
Supplied by California Water Service (Cal Water) - Visalia District. Here's what its 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
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From California Water Board lab results (2024–2026).
Nitrate (NO₃)
11–32 ppm (Worth knowing)
Typical 11 ppm
Water changes can't take your tank's nitrate below this level.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
Copper at home taps
0.04 ppm (Low)
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2025).
Chlorine or chloramine at the tap
1–2.3 ppm
Typical 1 ppm
At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
Water chemistry
General hardness
20–160 ppm
Typical 73 ppm
Moderately soft to medium. Suits most community fish and plants.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
Carbonate hardness (alkalinity)
53–140 ppm
Typical 85 ppm
Moderate buffering. pH should stay fairly steady.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
pH
5.6–9.3
Typical 7.5
Most community fish do well here. Stable water matters more than the exact number.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
Total dissolved solids
93–260 ppm
Typical 151 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
Published by your utility: California Water Service (Cal Water) - Visalia District's 2024 water quality report.
Who supplies Visalia, CA
- 2024 water quality report
California Water Service (Cal Water) - Visalia District
Serves 96% 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.