Waukesha County, Wisconsin
UR09
850300
1,210.27
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Okauchee Lake was evaluated for phosphorus and algae every two years between 2014 and 2024. Phosphorus levels were found to be too high. This lake is covered by a watershed plan: Mason Creek Watershed Protection Plan (2028).Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Impairment Unknown
Current Use
Restricted Recreation
Listing Status
303d Listed
Attainable Use
Recreation
Priority
Low
Designated Use
Recreation
303(d) ID
2014-239
Listing Date
4/1/2014
Impaired Water Notes
This water was assessed during the 2018 listing cycle; total phosphorus sample data exceed 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, however chlorophyll data do not exceed REC or FAL thresholds.
Date
7/11/2017
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, however, chlorophyll data do not exceed thresholds.
Date
1/3/2014
Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, however chlorophyll data do not exceed REC or FAL thresholds.
Date
10/12/2015
Impaired Water Notes
This water was assessed during the 2020 listing cycle; total phosphorus sample data exceeded 2020 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, however chlorophyll data did not exceed REC or 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 stream is covered by the following restoration plan and this listing was classified as Category 5W as a result: Mason Creek Watershed Protection Plan (2028).
Date
8/15/2019
Impaired Water Notes
This water was assessed during the 2022 listing cycle; total phosphorus sample data exceeded 2022 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.
Date
5/25/2021