Broadmoor, CA tap water
Supplied mostly by California Water Service-S San Francisco, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chloramine
Your water is treated with chloramine. Unlike chlorine, it doesn't gas off when water sits out, and many pitcher and fridge filters aren't rated to remove it. Conditioners that list chloramine on the label break it apart, which frees about 0.68 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Ammonia (with conditioner)
Estimate0.1–0.75 ppm (Worth knowing)
Typical 0.68 ppm
This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day; a big water change in a new or very small tank adds more of it at once. Some conditioners also bind ammonia for a day or so.
Estimated from the chloramine level City of Daly City reports (2022).
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; EPA monitoring data (2016–2026).
Nitrate (NO₃)
Up to 5.3 ppm (Low)
Typical 5.3 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results (2023–2026).
Copper at home taps
0.01–0.16 ppm (Low)
Typical 0.04 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results; City of Daly City's 2022 water quality report (2022–2025).
Chlorine or chloramine at the tap
0.4–3.1 ppm
Typical 2.8 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 Daly City's 2022 water quality report.
Water chemistry
General hardness
Estimate45–650 ppm
Typical 380 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
Estimated from California Water Service-S San Francisco's calcium and magnesium readings; City of Daly City's 2022 water quality report (2022–2026).
Carbonate hardness (alkalinity)
Supplier's figure7–166 ppm
Typical 84 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: San Francisco Regional Water System, which supplies California Water Service-S San Francisco; City of Daly City's 2022 water quality report (2022–2025).
pH
7.2–9.6
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results; City of Daly City's 2022 water quality report (2022–2026).
Total dissolved solids
Supplier's figure20–269 ppm
Typical 146 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: San Francisco Regional Water System, which supplies California Water Service-S San Francisco; City of Daly City's 2022 water quality report (2022–2025).
Who supplies Broadmoor, CA
California Water Service-S San Francisco
Serves 87% of residents · Buys water from San Francisco Regional Water System · Chloramine
- 2022 water quality report
City of Daly City
Serves 9% of residents · Buys water from San Francisco Regional Water System · Chloramine
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.