Julian, CA tap water
Supplied mostly by Majestic Pines Community SD, 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 (2015–2018).
Nitrate (NO₃)
Up to 0.9 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results, measured before treatment; EPA monitoring data (2012–2026).
Copper at home taps
Up to 0.27 ppm (Worth knowing)
Typical 0.27 ppm
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).
Water chemistry
General hardness
106–160 ppm
Typical 140 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results, measured before treatment; California Water Board lab results (2023–2025).
Carbonate hardness (alkalinity)
70–120 ppm
Typical 110 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results, measured before treatment; California Water Board lab results (2024–2025).
pH
6.6–7.9
Typical 7.3
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment; California Water Board lab results (2024–2025).
Total dissolved solids
200–400 ppm
Typical 270 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; California Water Board lab results (2023–2025).
Who supplies Julian, CA
Majestic Pines Community SD
Serves 68% of residents · Groundwater (wells) · Chlorine
Julian Community Services District
Serves 30% of residents · Groundwater (wells) · 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.
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.