Dane County, Wisconsin
LR06
802600
3,200.49
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Lake Kegonsa was put on the Impaired Waters List for phosphorus and excess algae in the 2012 cycle. Evaluations every two-year cycle from 2014 to 2024 showed continued elevated phosphorus and algae. This lake is part of the Rock River TMDL.
Fish tissue analysis for PFOS resulted in a specific fish consumption advisory. A PFOS listing was added in the 2022 cycle.Pollutant
PFOS
Listed For
Fish Consumption
Impairments
PFOS Contaminated Fish Tissue
Current Use
Specific Restricted Fish Consumption
Listing Status
303d Listed
Attainable Use
General Fish Consumption Advice
Priority
Low
Designated Use
General Fish Consumption Advice
303(d) ID
2022-117
Listing Date
4/1/2022
Impaired Water Notes
Recent sampling by the Wisconsin Department of Natural Resources shows elevated PFOS in fish tissue.
Date
10/13/2021
Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Excess Algal Growth, Eutrophication
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Recreation
Priority
Not Applicable
Designated Use
Recreation
303(d) ID
2012-2030
Listing Date
4/1/2012
Impaired Water Notes
This water had a TMDL for total phosphorus approved by the EPA in 2011.
Date
9/28/2011
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus and chlorophyll sample data exceeded 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.
Date
7/10/2017
Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceed 2016 WisCALM listing thresholds for the Recreation use, and chlorophyll data exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.
Date
10/12/2015
Impaired Water Notes
This water was assessed during the 2020 listing cycle; total phosphorus sample data overwhelmingly exceeded 2020 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data also exceeded REC and FAL thresholds. Chloride data were also assessed but did not exceed 2020 WisCALM criteria. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
6/19/2019
Impaired Water Notes
This water was assessed during the 2022 listing cycle; total phosphorus sample data overwhelmingly exceeded 2022 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data also exceeded REC and FAL thresholds.
Date
5/25/2021