Fair Oaks, CA tap water
Supplied mostly by Fair Oaks Water District, 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 EPA monitoring data (2016).
Nitrate (NO₃)
Supplier's figureUp to 10 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From the utility that supplies yours: San Juan Water District, which supplies Fair Oaks Water District; EPA monitoring data (2014–2025).
Copper at home taps
Up to 0.06 ppm (Low)
Typically not detected
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2024–2026).
Water chemistry
General hardness
Supplier's figure17 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: San Juan Water District, which supplies Fair Oaks Water District; San Juan Water District, which supplies Citrus Heights Water District (2025).
Carbonate hardness (alkalinity)
Supplier's figure14 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: San Juan Water District, which supplies Fair Oaks Water District; San Juan Water District, which supplies Citrus Heights Water District (2025).
pH
Supplier's figure7.3
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: San Juan Water District, which supplies Fair Oaks Water District; San Juan Water District, which supplies Citrus Heights Water District (2025).
Total dissolved solids
Supplier's figure31 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: San Juan Water District, which supplies Fair Oaks Water District; San Juan Water District, which supplies Citrus Heights Water District (2025).
Who supplies Fair Oaks, CA
Fair Oaks Water District
Serves 90% of residents · Buys water from San Juan Water District · Chlorine
Citrus Heights Water District
Serves 9% of residents · Buys water from San Juan Water District · 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.