Lathrop, CA tap water
Supplied mostly by City of Lathrop, plus 1 other utility. 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
Nitrate (NO₃)
Supplier's figureUp to 17 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From the utility that supplies yours: South San Joaquin Irrigation District, which supplies City of Lathrop; California Water Board lab results, measured before treatment (2023–2026).
Copper at home taps
0.06–0.33 ppm (Low)
Typical 0.06 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2024).
Water chemistry
General hardness
Supplier's figure33–287 ppm
Typical 33 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: South San Joaquin Irrigation District, which supplies City of Lathrop; California Water Board lab results, measured before treatment (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure36–270 ppm
Typical 36 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: South San Joaquin Irrigation District, which supplies City of Lathrop; California Water Board lab results, measured before treatment (2023–2026).
pH
Supplier's figure7–8.1
Typical 8.1
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: South San Joaquin Irrigation District, which supplies City of Lathrop; California Water Board lab results, measured before treatment (2023–2026).
Total dissolved solids
Supplier's figure55–450 ppm
Typical 55 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: South San Joaquin Irrigation District, which supplies City of Lathrop; California Water Board lab results, measured before treatment (2023–2026).
Who supplies Lathrop, CA
City of Lathrop
Serves all residents · Buys water from South San Joaquin Irrigation District · Chlorine
San Joaquin County-Mokelumne Acres
Serves 41% 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.