Muscoy, CA tap water
Supplied mostly by Muscoy Mwc No. 1, 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
Nitrate (NO₃)
Up to 15 ppm (Worth knowing)
Typical 14 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results, measured before treatment; City of San Bernardino Municipal Water Department's 2024 water quality report (2023–2025).
Copper at home taps
0.06–0.13 ppm (Low)
Typical 0.06 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2023–2026).
Chlorine or chloramine at the tap
0.2–3.2 ppm
Typical 0.7 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: City of San Bernardino Municipal Water Department's 2024 water quality report.
Water chemistry
General hardness
130–330 ppm
Typical 230 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From California Water Board lab results, measured before treatment; City of San Bernardino Municipal Water Department's 2024 water quality report.
Carbonate hardness (alkalinity)
170–260 ppm
Typical 190 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results, measured before treatment (2023–2024).
pH
7.4–8.1
Typical 7.6
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment (2023–2024).
Total dissolved solids
200–440 ppm
Typical 300 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; City of San Bernardino Municipal Water Department's 2024 water quality report.
Who supplies Muscoy, CA
Muscoy Mwc No. 1
Serves 61% of residents · Groundwater (wells) · Chlorine
- 2024 water quality report
City of San Bernardino Municipal Water Department
Serves 29% 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.