East Oakdale, CA tap water
Supplied mostly by Oid-Oakdale Rural Water System #1, plus 4 other utilities. Here's what the 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 (2017).
Nitrate (NO₃)
4.9–37 ppm (Worth knowing)
Typical 14 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results, measured before treatment; EPA monitoring data (2017–2025).
Copper at home taps
Up to 0.07 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 (2023–2024).
Water chemistry
General hardness
57–190 ppm
Typical 124 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results, measured before treatment (2023–2024).
Carbonate hardness (alkalinity)
28–160 ppm
Typical 94 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results, measured before treatment (2023–2024).
pH
7.3–8.1
Typical 7.9
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment; EPA monitoring data (2017–2023).
Total dissolved solids
140–280 ppm
Typical 210 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 East Oakdale, CA
Oid-Oakdale Rural Water System #1
Serves 30% of residents · Groundwater (wells) · Disinfectant not listed
Oid #46 - Sunset Oaks
Serves 28% of residents · Groundwater (wells) · Disinfectant not listed
North Oaks Mutual Water Co
Serves 23% of residents · Groundwater (wells) · Disinfectant not listed
Oid #51 - Sunset Oaks #10
Serves 8% of residents · Groundwater (wells) · Disinfectant not listed
Oid #45
Serves 5% 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.