Yucaipa, CA tap water
Supplied mostly by Yucaipa Valley Water District, plus 2 other utilities. 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
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)
5.3–36 ppm (Low)
Typical 7.7 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results; California Water Board lab results, measured before treatment; Yucaipa Valley Water District, which supplies Western Heights Water Company (2023–2026).
Copper at home taps
Up to 0.08 ppm (Low)
Typically not detected
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2023–2026).
Water chemistry
General hardness
18–250 ppm
Typical 150 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
From California Water Board lab results; California Water Board lab results, measured before treatment; Yucaipa Valley Water District, which supplies Western Heights Water Company (2023–2025).
Carbonate hardness (alkalinity)
110–210 ppm
Typical 175 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; Yucaipa Valley Water District, which supplies Western Heights Water Company (2023–2025).
pH
7.8–9.2
Typical 8.1
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From California Water Board lab results; California Water Board lab results, measured before treatment; Yucaipa Valley Water District, which supplies Western Heights Water Company (2023–2025).
Total dissolved solids
150–350 ppm
Typical 175 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; Yucaipa Valley Water District, which supplies Western Heights Water Company (2023–2025).
Who supplies Yucaipa, CA
Yucaipa Valley Water District
Serves 86% of residents · Lake or river water · Chlorine
South Mesa Wc
Serves 8% of residents · Groundwater (wells) · Chlorine
Western Heights Water Company
Serves 5% of residents · Buys water from Yucaipa Valley Water District · 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.
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.