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For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Oconomowoc Lake

Village Of Oconomowoc Lake [exit DNR]

Find A Lake > Waukesha County > Oconomowoc Lake

Oconomowoc Lake
Waukesha County, 818 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 36 (Oligotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Excellent.

Oconomowoc 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. 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
Oconomowoc Lake - A10021807Map2007Details
Oconomowoc Lake - B10021806Map2007Details
Oconomowoc Lake - C10021808Map2007Details
Oconomowoc Lake - D10021809Map2007Details
Oconomowoc Lake - Deep Hole683139Map2020Details
Oconomowoc Lake - Deep Hole W Basin683417Map1995Details
Oconomowoc Lake - E10021810Map2007Details
Oconomowoc Lake - F10021811Map2007Details
Oconomowoc Lake - G10021814Map2007Details
Oconomowoc Lake - H10021815Map2007Details
Oconomowoc Lake - I10021816Map2007Details
Oconomowoc Lake - J10021817Map2007Details
Oconomowoc Lake - Upper683140Map1975Details
Oconomowoc Lake Duplicate - A10021793Map2007Details
Oconomowoc Lake Duplicate - B10021794Map2007Details
Oconomowoc Lake Duplicate - C10021795Map2007Details
Oconomowoc Lake Duplicate - D10021796Map2007Details
Oconomowoc Lake Duplicate - E10021797Map2007Details
Oconomowoc Lake Duplicate - F10021798Map2007Details
Oconomowoc Lake Duplicate - G10021799Map2007Details
Oconomowoc Lake Duplicate - H10021800Map2007Details
Oconomowoc Lake Duplicate - I10021801Map2007Details
Oconomowoc Lake Duplicate - J10021802Map2007Details
Oconomowoc Lake Site #1 - Center At Oconomowoc WI683448Map2017Details
Oconomowoc Lake Site #2 (Hewitt Pt) - Deep Hole Northeast Bay683302Map2020Details
Oconomowoc Lake Site #2 (Hewitt Pt) - Deep Hole Northeast Bay683447Map2002Details