Janesville, WI tap water
Supplied by Janesville Water Utility. 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 (2014–2017).
Nitrate (NO₃)
Up to 37 ppm (High)
Typical 28 ppm
High for tap water. Water changes can't take your tank's nitrate below this level.
From EPA monitoring data (2013–2019).
Water chemistry
General hardness
Area estimate46–431 ppm
Typical 273 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
Area estimate from nearby wells: USGS well samples in your state (2000–2023).
Carbonate hardness (alkalinity)
290–310 ppm
Typical 295 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2017).
pH
7.3–7.4
Typical 7.3
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2017).
Total dissolved solids
Area estimate92–497 ppm
Typical 258 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
Area estimate from nearby wells: USGS well samples in your state (2000–2023).
Who supplies Janesville, WI
Janesville Water Utility
Serves 92% 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.