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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 45 (Mesotrophic) and was determined using Secchi data. For a Two-Story lake, this is considered Good.

North Lake has been monitored by volunteers since 1986. Volunteers monitor water clarity with a black and white Secchi disk. 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. Additional monitoring has been done through projects funded in part by DNR Lake Grants. 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 Hole683137Map2022Details
North Lake - Near Oconomowoc River10020503Map2006Details
North Lake - Site 110055181Map2022Details
North Lake - Site 210055182Map2022Details
North Lake - Site 310055183Map2022Details
North Lake - Site 410055184Map2022Details
North Lake - Site 510055185Map2022Details
North Lake - Site 610055186Map2022Details
North Lake - Site 710055187Map2022Details