Ovilla, TX tap water
Supplied mostly by City of Ovilla, 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 EPA monitoring data (2012–2015).
Nitrate (NO₃)
Supplier's figureUp to 3.5 ppm (Low)
Typical 3 ppm
Low, so water changes lower your tank's nitrate well.
From the utility that supplies yours: Dallas Water Utility, which supplies City of Ovilla; EPA monitoring data (2012–2025).
Water chemistry
General hardness
Supplier's figure106–179 ppm
Typical 131 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: Dallas Water Utility, which supplies City of Ovilla; Dallas Water Utility, which supplies City of Glenn Heights.
Carbonate hardness (alkalinity)
Supplier's figure48–424 ppm
Typical 77 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: Dallas Water Utility, which supplies City of Ovilla; EPA monitoring data (2013–2019).
pH
Supplier's figure7.7–8.8
Typical 7.9
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: Dallas Water Utility, which supplies City of Ovilla; Dallas Water Utility, which supplies City of Glenn Heights (2018–2019).
- City of Ovilla and City of Glenn Heights add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Ovilla, TX
City of Ovilla
Serves 66% of residents · Buys water from Dallas Water Utility · Chloramine
Sardis Lone Elm WSC
Serves 25% of residents · Buys water from Rockett SUD · Chloramine
City of Glenn Heights
Serves 6% of residents · Buys water from Dallas Water Utility · 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.