Ozaukee, Sheboygan County, Wisconsin
SH01
50100
0.00 - 10.19
10.19
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This water was assessed every two year cycle from 2012 to 2020 for phosphorus and biology; phosphorus was put on the impaired waters list in 2012 and elevated levels were confirmed in the cycles to follow. This water is covered by the Northeast Lakeshore TMDL, approved in 2023.Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Degraded Biological Community
Current Use
Unsupported Aquatic Life
Listing Status
TMDL Approved
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Not Applicable
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
2012-41
Listing Date
4/1/2012
Impaired Water Notes
Based on the total phosphorus criteria excursions and the corroborating biological assessment (poor scoring fish IBI), this water is proposed as a new listing due to the “degraded biological community” impairment caused by elevated total phosphorus concentrations.
Date
8/2/2011
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing criteria for the Fish and Aquatic Life use and biological impairment was observed (i.e. at least one macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the poor condition category).
Date
2/26/2014
Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing criteria for the Fish and Aquatic Life use and biological impairment was observed (i.e. at least one macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the poor condition category).
Date
9/28/2015
Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data exceed 2020 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category). Temperature was also assessed and did not exceed 2020 WisCALM listing criteria. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
6/17/2019