Delafield, WI tap water
Supplied mostly by Delafield Square, plus 6 other utilities. Here's what the water means for your fish.
Disinfectant
Not confirmed
We couldn't confirm how your water is disinfected. US utilities use chlorine or chloramine, and chloramine doesn't gas off when water sits out.
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 23 ppm (Low)
Typically not detected
Not detected in testing, 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)
260–340 ppm
Typical 290 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2012–2019).
pH
7.2–8.1
Typical 7.6
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2012–2019).
- Hartland Waterworks adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Delafield Square, Knollcrest and Cambridge Place of Delafield soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Delafield, WI
Delafield Square
Serves 10% of residents · Groundwater (wells) · Disinfectant not listed
Sanctuary of Delafield
Serves 8% of residents · Groundwater (wells) · Disinfectant not listed
Parquelynn Village
Serves 7% of residents · Groundwater (wells) · Chlorine
Knollcrest
Serves 6% of residents · Groundwater (wells) · Disinfectant not listed
Cambridge Place of Delafield
Serves 6% of residents · Groundwater (wells) · Disinfectant not listed
Arbors
Serves 6% of residents · Groundwater (wells) · Disinfectant not listed
Hartland Waterworks
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.