Manteca, CA tap water
Supplied mostly by City of Manteca, 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
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 (2025–2026).
Nitrate (NO₃)
Up to 36 ppm (Worth knowing)
Typical 23 ppm
High for tap water. Water changes can't take your tank's nitrate below this level.
From California Water Board lab results (2023–2026).
Copper at home taps
Up to 0.05 ppm (Low)
Typical 0.05 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2023–2026).
Water chemistry
General hardness
Supplier's figure33 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 Manteca; California Water Board lab results (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure36 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: South San Joaquin Irrigation District, which supplies City of Manteca; California Water Board lab results (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: South San Joaquin Irrigation District, which supplies City of Manteca; California Water Board lab results (2023–2026).
Total dissolved solids
Supplier's figure55 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 Manteca; California Water Board lab results (2023–2026).
Who supplies Manteca, CA
City of Manteca
Serves 95% of residents · Buys water from South San Joaquin Irrigation District · Chlorine
South San Joaquin Irrigation District
Serves 46% of residents · Lake or river water · 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.