Clearlake Oaks, CA tap water
Supplied by Clearlake Oaks County Water District. Here's what its 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)
3.4 ppm (Low)
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2017).
Copper at home taps
0.29 ppm (Worth knowing)
Shrimp and snails are sensitive to copper. Water that sits in household pipes picks up the most; it drops once the tap has run for a minute.
From California Water Board lab results (2023–2024).
Water chemistry
General hardness
141 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results (2023–2025).
Carbonate hardness (alkalinity)
140 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results (2023–2025).
pH
8.3
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From California Water Board lab results (2023–2025).
Total dissolved solids
200 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 (2023–2025).
- Clearlake Oaks County Water District adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Clearlake Oaks, CA
Clearlake Oaks County Water District
Serves all 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.