Pasadena, TX tap water
Supplied by City of Pasadena. Here's what its 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 figureUp to 4.2 ppm (Low)
Typical 1.1 ppm
Low, so water changes lower your tank's nitrate well.
From the utility that supplies yours: City of Houston, which supplies City of Pasadena (2024).
Water chemistry
General hardness
Supplier's figure43–183 ppm
Typical 118 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: City of Houston, which supplies City of Pasadena (2024).
Carbonate hardness (alkalinity)
99–366 ppm
Typical 276 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2013–2018).
pH
8–8.6
Typical 8.3
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From EPA monitoring data (2018).
Total dissolved solids
Supplier's figure144–321 ppm
Typical 203 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: City of Houston, which supplies City of Pasadena (2024).
- City of Pasadena softens its water at the plant, so it may be softer than the local groundwater.
Who supplies Pasadena, TX
City of Pasadena
Serves 93% of residents · Buys water from City of Houston · 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.
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.