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Geneva Lake
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 37 (Oligotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Excellent.
Geneva Lake was monitored by volunteers between 1986 and 1994. 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 and Aquatic Invasive Species Grants. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.
Water Quality Reports and Graphs
| Station Name | Station ID | Map | Max Year | Reports |
|---|
| Geneva Lake | 653303 | Map | 2014 | Details |
| Geneva Lake | 172 | Map | 1970 | Details |
| Geneva Lake - Buttons Bay | 999107 | Map | 1994 | Details |
| Geneva Lake - Deep Hole-Site A | 653122 | Map | 2025 | Details |
| Geneva Lake - East Basin | 653258 | Map | 1996 | Details |
| Geneva Lake - Narrows | 653257 | Map | 1996 | Details |
| Geneva Lake - South Side | 653302 | Map | 2005 | Details |
| Geneva Lake Site B at East End Near Lake Geneva WI | 653262 | Map | 2025 | Details |
| Geneva Lake at Center Near Lake Geneva WI | 653263 | Map | 2015 | Details |
| Geneva Lake at Geneva Bay | 653261 | Map | 1999 | Details |
| Geneva Lake at Willams Bay | 653264 | Map | 2010 | Details |
| Lake Geneva - Trinke Lagoon Outlet | 10048422 | Map | 2019 | Details |
| Outlet to Lake Geneva, Unnamed (Button Creek) | 10051985 | Map | 2020 | Details |
| Trinke Lagoon GL1, Geneva Lake | 10052574 | Map | 2019 | Details |
| Trinke Lagoon GL2, Geneva Lake | 10052576 | Map | 2019 | Details |