St. Charles, IL tap water
Supplied mostly by St Charles, plus 2 other utilities. Here's what the 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)
Up to 1.8 ppm (Low)
Typical 0.1 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
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)
58–390 ppm
Typical 310 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2018).
pH
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
- St Charles and West Chicago soften their water at the plant, so it may be softer than the local groundwater.
Who supplies St. Charles, IL
St Charles
Serves 82% of residents · Groundwater (wells) · Chlorine
Geneva
Serves 10% of residents · Groundwater (wells) · Chlorine
West Chicago
Serves 5% of residents · Groundwater (wells) · 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.