Rochester, IL tap water
Supplied by Rochester. 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 figure0.9 ppm (Low)
Low, so water changes lower your tank's nitrate well.
From the utility that supplies yours: Springfield, which supplies Rochester (2012–2019).
Water chemistry
General hardness
Supplier's figure80–142 ppm
Typical 99 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: Springfield, which supplies Rochester (2025).
Carbonate hardness (alkalinity)
Supplier's figure30–93 ppm
Typical 49 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: Springfield, which supplies Rochester (2025).
pH
Supplier's figure9.1–9.7
Typical 9.4
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: Springfield, which supplies Rochester (2025).
- Rochester adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Rochester softens its water at the plant, so it may be softer than the local groundwater.
Who supplies Rochester, IL
Rochester
Serves all residents · Buys water from Springfield · 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.