Arnold, CA tap water
Supplied mostly by Blue Lake Springs Mut Wtr, 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 (2024–2026).
Nitrate (NO₃)
Supplier's figureNot detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From the utility that supplies yours: Ccwd - Ebbetts Pass, which supplies Blue Lake Springs Mut Wtr; California Water Board lab results (2023–2026).
Copper at home taps
Up to 0.18 ppm (Worth knowing)
Typical 0.18 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 (2024–2025).
Water chemistry
General hardness
Supplier's figure19 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: Ccwd - Ebbetts Pass, which supplies Blue Lake Springs Mut Wtr; California Water Board lab results (2023).
Carbonate hardness (alkalinity)
Supplier's figure13 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: Ccwd - Ebbetts Pass, which supplies Blue Lake Springs Mut Wtr; California Water Board lab results (2023–2026).
pH
Supplier's figure7.2
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: Ccwd - Ebbetts Pass, which supplies Blue Lake Springs Mut Wtr; California Water Board lab results (2023–2026).
Total dissolved solids
Supplier's figure41 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 the utility that supplies yours: Ccwd - Ebbetts Pass, which supplies Blue Lake Springs Mut Wtr; California Water Board lab results (2025).
Who supplies Arnold, CA
Blue Lake Springs Mut Wtr
Serves 34% of residents · Buys water from Ccwd - Ebbetts Pass · Chlorine
Ccwd - Ebbetts Pass
Serves 24% of residents · Lake or river water · 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.