Jamestown, CA tap water
Supplied mostly by Tud - Sonora/Jamestown Water System, plus 1 other utility. 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
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 (2023–2025).
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results; Tud - Sonora/Jamestown Water System, which supplies Sonora Water Resources, Inc (2023–2025).
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 (2023–2025).
Water chemistry
General hardness
16 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From California Water Board lab results; Tud - Sonora/Jamestown Water System, which supplies Sonora Water Resources, Inc (2023–2025).
Carbonate hardness (alkalinity)
20 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From California Water Board lab results; Tud - Sonora/Jamestown Water System, which supplies Sonora Water Resources, Inc (2023–2025).
pH
6.5
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results; Tud - Sonora/Jamestown Water System, which supplies Sonora Water Resources, Inc (2023–2025).
Total dissolved solids
34 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; Tud - Sonora/Jamestown Water System, which supplies Sonora Water Resources, Inc (2023–2025).
- Tud - Sonora/Jamestown Water System and Sonora Water Resources, Inc add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Jamestown, CA
Tud - Sonora/Jamestown Water System
Serves 81% of residents · Lake or river water · Chlorine
Sonora Water Resources, Inc
Serves 24% of residents · Buys water from Tud - Sonora/Jamestown Water System · 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.