Find A Lake > Waukesha County > Oconomowoc Lake
Oconomowoc 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.
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 Name | Station ID | Map | Max Year | Reports |
|---|
| Oconomowoc Lake - A | 10021807 | Map | 2007 | Details |
| Oconomowoc Lake - B | 10021806 | Map | 2007 | Details |
| Oconomowoc Lake - C | 10021808 | Map | 2007 | Details |
| Oconomowoc Lake - D | 10021809 | Map | 2007 | Details |
| Oconomowoc Lake - Deep Hole | 683139 | Map | 2023 | Details |
| Oconomowoc Lake - Deep Hole W Basin | 683417 | Map | 1995 | Details |
| Oconomowoc Lake - E | 10021810 | Map | 2007 | Details |
| Oconomowoc Lake - F | 10021811 | Map | 2007 | Details |
| Oconomowoc Lake - G | 10021814 | Map | 2007 | Details |
| Oconomowoc Lake - H | 10021815 | Map | 2007 | Details |
| Oconomowoc Lake - I | 10021816 | Map | 2007 | Details |
| Oconomowoc Lake - J | 10021817 | Map | 2007 | Details |
| Oconomowoc Lake - Upper | 683140 | Map | 1975 | Details |
| Oconomowoc Lake Duplicate - A | 10021793 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - B | 10021794 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - C | 10021795 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - D | 10021796 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - E | 10021797 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - F | 10021798 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - G | 10021799 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - H | 10021800 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - I | 10021801 | Map | 2007 | Details |
| Oconomowoc Lake Duplicate - J | 10021802 | Map | 2007 | Details |
| Oconomowoc Lake Site #1 - Center At Oconomowoc WI | 683448 | Map | 2017 | Details |
| Oconomowoc Lake Site #2 (Hewitt Pt) - Deep Hole Northeast Bay | 683447 | Map | 2002 | Details |
| Oconomowoc Lake Site #2 (Hewitt Pt) - Deep Hole Northeast Bay | 683302 | Map | 2023 | Details |