Impaired Water - Lake Monona (Monona Lake)
Dane County, Wisconsin
LR08
804600
3,359.00
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Lake Monona was originally listed as impaired in 1998. This water is currently listed due to PCBs in lake bottom sediment. There is a specific fish consumption guidline for PCBs in fish tissue for this lake. The lake has zebra mussels, eurasian watermilfoil, and curly leaf pondweed.
Lake Monona was evaluated for phosphorus and algae every two years between 2012 and 2022. Phosphorus levels were found to be too high, which was reflected in algal blooms. The TMDL restoration plan was approved in 2011.
Lake Monona was placed under a special fish consumption advisory for PFOS in 2020; this lake had a listing of PFOS in fish tissue placed on the 2022 Impaired Waters List.
Listing Details
Pollutant
PFOS
Listed For
Fish Consumption
Impairments
PFOS Contaminated Fish Tissue
Current Use
Specific Restricted Fish Consumption
Listing Status
303d Listed
Attainable Use
Unrestricted Fish Consumption
Priority
Low
Designated Use
Unrestricted Fish Consumption
303(d) ID
2022-001
Listing Date
4/1/2022
Impaired Water Notes
Recent sampling by the Wisconsin Department of Natural Resources shows elevated PFOS in fish tissue and surface water in those waterways. PFOS is one of many per- and polyfluoroalkyl substances (PFAS). PFOS detection is the driving force behind establishing the fish consumption advisory for Starkweather Creek and Lake Monona in Dane County.
Date
1/22/2021

 
Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Excess Algal Growth, Eutrophication
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Full Body Contact - Swimming, Boating
Priority
Not Applicable
Designated Use
Full Body Contact - Swimming, Boating
303(d) ID
2012-2028
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 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use and chlorophyll data exceeded REC and FAL thresholds.
Date
2/28/2014

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceeded 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data overwhelmingly exceeded FAL thresholds and exceeded REC thresholds.
Date
10/9/2015

Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data overwhelmingly exceeded 2020 WisCALM listing thresholds for the Recreation use and Aquatic Life use. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
8/2/2019

Impaired Water Notes
This water was assessed during the 2022 listing cycle; new total phosphorus sample data overwhelmingly exceeded 2022 WisCALM listing thresholds for the Recreation use and Aquatic Life use. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
5/25/2021

 
Pollutant
Mercury
Listed For
Fish Consumption
Impairments
NA
Current Use
Specific Restricted Fish Consumption
Listing Status
Pollutant Removed
Attainable Use
Unrestricted Fish Consumption
Priority
Delisted 2008
Designated Use
Unrestricted Fish Consumption
303(d) ID
299
Listing Date
4/1/1998
Impaired Water Notes
New montioring data. New data indicates no specific advisory should exist.
Date
4/1/2008

 
Pollutant
PCBs
Listed For
Fish Consumption
Impairments
PCBs Contaminated Fish Tissue, PCB Contaminated Sediments
Current Use
Specific Restricted Fish Consumption
Listing Status
303d Listed
Attainable Use
Unrestricted Fish Consumption
Priority
Low
Designated Use
Unrestricted Fish Consumption
303(d) ID
299
Listing Date
4/1/1998
Impaired Water Notes
Lake Monona - Remove Hg from list of pollutants. Special advice only for PCBs. 2002 data.
Date
10/26/2010