North Tustin, CA tap water
Supplied mostly by City of Tustin, plus 2 other utilities. Here's what the water means for your fish.
Disinfectant
Chloramine
Your water is treated with chloramine. Unlike chlorine, it doesn't gas off when water sits out, and many pitcher and fridge filters aren't rated to remove it. Conditioners that list chloramine on the label break it apart, which frees a little ammonia. Some utilities switch to plain chlorine for a few weeks a year.
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 California Water Board lab results (2025–2026).
Nitrate (NO₃)
9–19 ppm (Worth knowing)
Typical 19 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results (2023–2026).
Copper at home taps
0.04–0.11 ppm (Low)
Typical 0.08 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2024–2025).
Water chemistry
General hardness
82–291 ppm
Typical 114 ppm
Moderately soft to medium. Suits most community fish and plants.
From California Water Board lab results; Metropolitan Water Dist. of So. Cal., which supplies Golden State Wc - Cowan Heights; Metropolitan Water Dist. of So. Cal., which supplies East Orange County WD - Rz (2023–2026).
Carbonate hardness (alkalinity)
65–229 ppm
Typical 172 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results (2024–2026).
pH
7.7–8.7
Typical 7.7
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results; Metropolitan Water Dist. of So. Cal., which supplies Golden State Wc - Cowan Heights; Metropolitan Water Dist. of So. Cal., which supplies East Orange County WD - Rz (2023–2026).
Total dissolved solids
220–799 ppm
Typical 539 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 (2023–2026).
Who supplies North Tustin, CA
City of Tustin
Serves 67% of residents · Buys water from East Orange County WD - Wz · Chloramine
Golden State Wc - Cowan Heights
Serves 23% of residents · Buys water from East Orange County WD - Wz · Chloramine
East Orange County WD - Rz
Serves 6% of residents · Buys water from East Orange County WD - Wz · Chloramine
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.