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Find A Lake > Waukesha County > North Lake

North Lake
Waukesha County, 440 Acres


Water Quality

One measure of a lakes health is the trophic state, which relates to the amount of algae in the water. The average summer trophic state for the last 5 years was 51 (Eutrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Fair.

North Lake has been monitored by volunteers since 1986. Volunteers monitor water clarity with a black and white Secchi disk. Some also collect water samples, which are sent to the State Lab of Hygiene to be analyzed. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. North Lake is also part of DNR's long term trend monitoring project. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.

Water Quality Reports and Graphs

Station NameStation IDMapMax YearReports
North Lake - Deep Hole683137Map2019Details
North Lake - Near Oconomowoc River10020503Map2006Details