Dayton, OH tap water
Supplied by City of Dayton Department of Water. Here's what its water means for your fish.
Disinfectant
Chlorine
Your water is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it.
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 (2012–2019).
Nitrate (NO₃)
0.4–7.6 ppm (Low)
Typical 4 ppm
Low, so water changes lower your tank's nitrate well.
Published by your utility: City of Dayton Department of Water's 2025 water quality report.
Chlorine or chloramine at the tap
1.2–1.4 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: City of Dayton Department of Water's 2025 water quality report.
Water chemistry
General hardness
154–155 ppm
Typical 154 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
Published by your utility: City of Dayton Department of Water's website.
Carbonate hardness (alkalinity)
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
pH
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
- City of Dayton Department of Water softens its water at the plant, so it may be softer than the local groundwater.
Who supplies Dayton, OH
- 2025 water quality report
City of Dayton Department of Water
Serves 94% of residents · Lake or river water · Chlorine
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.