Brentwood, TN tap water
Supplied mostly by Brentwood Water Department, plus 1 other utility. 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
Nitrate (NO₃)
Supplier's figure0.8–1.7 ppm (Low)
Typical 1.6 ppm
Low, so water changes lower your tank's nitrate well.
From the utility that supplies yours: Harpeth Valley U.D. and Metro Water Services, which supplies Brentwood Water Department; Metro Water Services and Smyrna Water System, which supplies Nolensville-College Grove U.D. (2014–2025).
Water chemistry
General hardness
Supplier's figure64–93 ppm
Typical 75 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: Metro Water Services, which supplies Brentwood Water Department; Metro Water Services, which supplies Nolensville-College Grove U.D. (2025).
Carbonate hardness (alkalinity)
Supplier's figure54–88 ppm
Typical 65 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: Metro Water Services, which supplies Brentwood Water Department; Metro Water Services, which supplies Nolensville-College Grove U.D. (2025).
pH
Supplier's figure7–7.7
Typical 7.5
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: Harpeth Valley U.D. and Metro Water Services, which supplies Brentwood Water Department; EPA monitoring data (2014–2025).
Total dissolved solids
Supplier's figure128–189 ppm
Typical 146 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 the utility that supplies yours: Metro Water Services, which supplies Brentwood Water Department; Metro Water Services, which supplies Nolensville-College Grove U.D. (2025).
- Brentwood Water Department and Nolensville-College Grove U.D. add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Brentwood, TN
Brentwood Water Department
Serves 59% of residents · Buys water from Harpeth Valley U.D. · Chloramine
Nolensville-College Grove U.D.
Serves 28% of residents · Buys water from Brentwood Water Department · 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.