Grayson, CA tap water
Supplied by City of Modesto - Grayson. Here's what its water means for your fish.
Disinfectant
Not confirmed
We couldn't confirm how your water is disinfected. US utilities use chlorine or chloramine, and chloramine doesn't gas off when water sits out.
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 EPA monitoring data (2012–2018).
Nitrate (NO₃)
15 ppm (Worth knowing)
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results (2023–2026).
Copper at home taps
0.07 ppm (Low)
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2023).
Water chemistry
General hardness
732–820 ppm
Typical 776 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From California Water Board lab results, measured before treatment (2023–2026).
Carbonate hardness (alkalinity)
210–225 ppm
Typical 218 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results, measured before treatment (2023–2026).
pH
7.8
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2013).
Total dissolved solids
1200–1400 ppm
Typical 1300 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 (2023–2026).
Who supplies Grayson, CA
City of Modesto - Grayson
Serves 88% of residents · Groundwater (wells) · Disinfectant not listed
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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.