Oakdale, CA tap water
Supplied by City of Oakdale. 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 (2015–2019).
Nitrate (NO₃)
13 ppm (Worth knowing)
Water changes can't take your tank's nitrate below this level.
From EPA monitoring data (2015–2019).
Copper at home taps
Not detected (Low)
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2025).
Water chemistry
General hardness
54–123 ppm
Typical 93 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results, measured before treatment (2024).
Carbonate hardness (alkalinity)
68–120 ppm
Typical 100 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2024).
pH
8.2
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From EPA monitoring data (2015–2019).
Total dissolved solids
130–230 ppm
Typical 170 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 (2023–2024).
Who supplies Oakdale, CA
City of Oakdale
Serves 95% 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.
Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.
Compiled by Shoal & Stem from public records. Free to cite with a link.