Corona, CA tap water
Supplied by City of Corona, Utilities Department. Here's what its 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 0.49 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Ammonia (with conditioner)
Estimate0.26–0.68 ppm (Low)
Typical 0.49 ppm
This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day.
Estimated from the chloramine level City of Corona, Utilities Department reports (2025).
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 (2023–2025).
Nitrate (NO₃)
10–89 ppm (Worth knowing)
Typical 10 ppm
Water changes can't take your tank's nitrate below this level.
Published by your utility: City of Corona, Utilities Department's 2025 water quality report.
Copper at home taps
0.04 ppm (Low)
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
1–2.8 ppm
Typical 2 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 Corona, Utilities Department's 2025 water quality report.
Water chemistry
General hardness
7–570 ppm
Typical 146 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
Published by your utility: City of Corona, Utilities Department's 2025 water quality report.
Carbonate hardness (alkalinity)
13–380 ppm
Typical 83 ppm
Moderate buffering. pH should stay fairly steady.
Published by your utility: City of Corona, Utilities Department's 2025 water quality report.
pH
7.5–9.8
Typical 8.2
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
Published by your utility: City of Corona, Utilities Department's 2025 water quality report.
Total dissolved solids
46–1200 ppm
Typical 385 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
Published by your utility: City of Corona, Utilities Department's 2025 water quality report.
- City of Corona, Utilities Department adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Corona, CA
- 2025 water quality report
City of Corona, Utilities Department
Serves 98% of residents · Buys water from Metropolitan Water Dist. of So. Cal. · 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.