Norco, CA tap water
Supplied mostly by City of Norco, 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 a little ammonia. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results; City of Norco, which supplies California Rehabilitation Center - Norco (2023–2025).
Copper at home taps
0.01–0.06 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 (2024–2025).
Water chemistry
General hardness
Supplier's figure7–570 ppm
Typical 188 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
From the utility that supplies yours: Western MWD and Jurupa Community SD and City of Corona and Chino Basin Desalter Auth. - Desalter 2 and City of Riverside, which supplies City of Norco; City of Norco, which supplies California Rehabilitation Center - Norco, measured before treatment (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure9–380 ppm
Typical 133 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From the utility that supplies yours: Western MWD and Jurupa Community SD and City of Corona and Chino Basin Desalter Auth. - Desalter 2 and City of Riverside, which supplies City of Norco; City of Norco, which supplies California Rehabilitation Center - Norco, measured before treatment (2023–2026).
pH
7.8–7.9
Typical 7.8
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data; California Water Board lab results (2014–2024).
Total dissolved solids
Supplier's figure27–1200 ppm
Typical 357 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: Western MWD and Jurupa Community SD and City of Corona and Chino Basin Desalter Auth. - Desalter 2 and City of Riverside, which supplies City of Norco; California Water Board lab results (2023–2026).
- City of Norco and California Rehabilitation Center - Norco add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Norco, CA
City of Norco
Serves 95% of residents · Buys water from Western MWD (Arlington) · Chloramine
California Rehabilitation Center - Norco
Serves 8% of residents · Buys water from City of Norco · 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.
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.