Arroyo Grande, CA tap water
Supplied by City of Arroyo Grande Utilities Division. 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 a little ammonia. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Nitrate (NO₃)
17 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
0.22 ppm (Worth knowing)
Shrimp and snails are sensitive to copper. Water that sits in household pipes picks up the most; it drops once the tap has run for a minute.
From California Water Board lab results (2023–2025).
Water chemistry
General hardness
Supplier's figure331 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From the utility that supplies yours: Lopez Project, which supplies City of Arroyo Grande Utilities Division (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure237 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From the utility that supplies yours: Lopez Project, which supplies City of Arroyo Grande Utilities Division (2023–2026).
pH
Supplier's figure8.1
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: Lopez Project, which supplies City of Arroyo Grande Utilities Division (2023–2026).
Total dissolved solids
Supplier's figure450 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 the utility that supplies yours: Lopez Project, which supplies City of Arroyo Grande Utilities Division (2023–2026).
Who supplies Arroyo Grande, CA
City of Arroyo Grande Utilities Division
Serves all residents · Buys water from Lopez Project · 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.