Irwindale, CA tap water
Supplied mostly by Valley County Water Dist., 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
Ammonia (with conditioner)
Estimate0.07–0.32 ppm (Low)
Typical 0.21 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 Azusa Light & Water reports (2024).
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2019).
Nitrate (NO₃)
12–25 ppm (Worth knowing)
Typical 15 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results; EPA monitoring data; Azusa Light & Water's 2024 water quality report (2019–2026).
Copper at home taps
0.09–0.86 ppm (Low)
Typical 0.09 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results; Azusa Light & Water's 2024 water quality report (2023–2024).
Chlorine or chloramine at the tap
0.3–1.3 ppm
Typical 0.9 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: Azusa Light & Water's 2024 water quality report.
Water chemistry
General hardness
90–243 ppm
Typical 243 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From California Water Board lab results; California Water Board lab results, measured before treatment; Azusa Light & Water's 2024 water quality report (2023–2026).
Carbonate hardness (alkalinity)
89–290 ppm
Typical 148 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results; California Water Board lab results, measured before treatment (2023–2026).
pH
7–8.4
Typical 7
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results; EPA monitoring data; Azusa Light & Water's 2024 water quality report (2019–2026).
Total dissolved solids
160–470 ppm
Typical 400 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; California Water Board lab results, measured before treatment; Azusa Light & Water's 2024 water quality report (2023–2026).
Who supplies Irwindale, CA
Valley County Water Dist.
Serves 77% of residents · Groundwater (wells) · Chlorine
Cal-Am Water Company - Duarte
Serves 21% of residents · Groundwater (wells) · Chlorine
- 2024 water quality report
Azusa Light & Water
Serves 6% of residents · Lake or river water · 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.