Zionsville, IN tap water
Supplied mostly by Citizens Energy Group, 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 about 0.49 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Ammonia (with conditioner)
Estimate0.02–0.75 ppm (Low)
Typical 0.49 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 Citizens Energy Group 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)
1.4–18 ppm (Low)
Typical 2 ppm
Low, so water changes lower your tank's nitrate well.
From Citizens Energy Group's 2025 water quality report; Citizens Water - Indianapolis, which supplies Citizens Water - Whitestown.
Chlorine or chloramine at the tap
0.1–3.1 ppm
Typical 2 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: Citizens Energy Group's 2025 water quality report.
Water chemistry
General hardness
148–497 ppm
Typical 360 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From Citizens Energy Group's 2025 water quality report; Citizens Water - Indianapolis, which supplies Citizens Water - Whitestown.
Carbonate hardness (alkalinity)
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
pH
6.5–8.5
Typical 7.4
Most community fish do well here. Stable water matters more than the exact number.
From Citizens Energy Group's 2025 water quality report; Citizens Water - Indianapolis, which supplies Citizens Water - Whitestown.
- Citizens Energy Group and Citizens Water - Whitestown add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Citizens Energy Group and Citizens Water - Whitestown soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Zionsville, IN
- 2025 water quality report
Citizens Energy Group
Serves 79% of residents · Lake or river water · Chloramine
Citizens Water - Whitestown
Serves 9% of residents · Buys water from Citizens Water - Indianapolis · 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.