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

Green Lake Property Owners Of Washington County In [exit DNR]

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Green Lake
Washington County, 70 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 42 (Mesotrophic) and was determined using chlorophyll data. For a Deep Seepage lake, this is considered Excellent. Deep Seepage lakes stratify, or form separate layers of water, during the summer months and have no inlet or outlet.

Green 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. 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
Green Lake - Deep Hole673208Map2020Details
Green Lake - Green Lake674003Map1979Details
Green Lake - [Herbicide Sampling Site GL1]10051486Map2019Details
Green Lake - [Herbicide Sampling Site GL2]10051487Map2019Details
Green Lake - [Herbicide Sampling Site GL3]10051488Map2019Details
Green Lake - [Herbicide Sampling Site GL4]10052079Map2019Details