Delhi, CA tap water
Supplied by Delhi CWD. Here's what its 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
Nitrate (NO₃)
5.2–27 ppm (Worth knowing)
Typical 21 ppm
High for tap water. Water changes can't take your tank's nitrate below this level.
From California Water Board lab results, measured before treatment (2023–2026).
Copper at home taps
Not detected (Low)
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2025).
Water chemistry
General hardness
43–143 ppm
Typical 91 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results, measured before treatment (2023–2024).
Carbonate hardness (alkalinity)
78–122 ppm
Typical 94 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2023–2024).
pH
7.2–7.9
Typical 7.5
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment (2023–2024).
Total dissolved solids
170–284 ppm
Typical 228 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, measured before treatment (2023–2024).
Who supplies Delhi, CA
Delhi CWD
Serves 64% of residents · Groundwater (wells) · 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.