King of Prussia, PA tap water
Supplied by Aqua Pennsylvania, Inc.. 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 about 0.3 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Ammonia (with conditioner)
EstimateUp to 0.79 ppm (Low)
Typical 0.3 ppm
This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day.
Estimated from the chloramine level Aqua Pennsylvania, Inc. reports (2025).
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2012–2019).
Nitrate (NO₃)
8.4–20 ppm (Worth knowing)
Typical 13 ppm
Water changes can't take your tank's nitrate below this level.
From EPA monitoring data (2012–2019).
Chlorine or chloramine at the tap
0–3.2 ppm
Typical 1.3 ppm
At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.
Published by your utility: Aqua Pennsylvania, Inc.'s 2025 water quality report.
Water chemistry
General hardness
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Carbonate hardness (alkalinity)
44–182 ppm
Typical 55 ppm
Moderate buffering. pH should stay fairly steady.
From EPA monitoring data (2018–2019).
pH
7–7.8
Typical 7.3
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2012–2019).
- Aqua Pennsylvania, Inc. adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies King of Prussia, PA
- 2025 water quality report
Aqua Pennsylvania, Inc.
Serves 89% of residents · Lake or river water · 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.