La Honda, CA tap water
Supplied mostly by Cuesta la Honda Guild Inc, plus 2 other utilities. Here's what the water means for your fish.
Disinfectant
Chlorine or chloramine
Utilities here use chlorine or chloramine, depending on which one serves your address. Chlorine slowly gases off from standing water; chloramine doesn't.
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 EPA monitoring data; California Water Board lab results (2014–2026).
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From EPA monitoring data; California Water Board lab results; California Water Board lab results, measured before treatment (2014–2026).
Copper at home taps
0.03–0.11 ppm (Low)
Typical 0.08 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2023–2026).
Water chemistry
General hardness
190–460 ppm
Typical 359 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From California Water Board lab results, measured before treatment; California Water Board lab results (2023–2026).
Carbonate hardness (alkalinity)
110–300 ppm
Typical 280 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results, measured before treatment; California Water Board lab results (2023–2026).
pH
7.4–9.2
Typical 7.4
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data; California Water Board lab results; California Water Board lab results, measured before treatment (2014–2026).
Total dissolved solids
320–580 ppm
Typical 500 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; California Water Board lab results (2023–2026).
Who supplies La Honda, CA
Cuesta la Honda Guild Inc
Serves 72% of residents · Lake or river water · Chlorine
California Water Service - Bear Gulch
Serves 44% of residents · Lake or river water · Chloramine
County Service Area 7
Serves 5% 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.
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.