Okauchee Lake, WI tap water
Part of Okauchee Lake is supplied by Oconomowoc Waterworks, plus 3 other utilities. Here's what its water means for your fish.
Disinfectant
Chlorine
Utility water here 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 (2012–2018).
Nitrate (NO₃)
Up to 20 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)
230–290 ppm
Typical 285 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2017–2018).
pH
7.3–7.9
Typical 7.4
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2017–2018).
- Oconomowoc Waterworks adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Okauchee Lake, WI
Oconomowoc Waterworks
Serves 29% of residents · Groundwater (wells) · Chlorine
Lake Drive Water Trust
Serves 12% of residents · Groundwater (wells) · Disinfectant not listed
Mission Lakes II
Serves 7% of residents · Groundwater (wells) · Disinfectant not listed
Parquelynn Village
Serves 5% of residents · Groundwater (wells) · Chlorine
We couldn't fully map which utility serves Okauchee Lake. These numbers come from the utilities we matched, which serve about 48% of residents.
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.