Vilas County, Wisconsin
UW45
1623400
429.43
Condition has improved over time; water is not impaired.
Notes
Pioneer Lake was on the 303(d) list due to mercury and was removed based on 2001 updated Fish Consumption advisories.
Aquatic plant communities of Pioneer Lake were evaluated in the 2024 cycle and data indicated a healthy system. This lake is on the Waters Attaining Standards List.
Pollutant
Mercury
Listed For
Impairments
NA
Current Use
Listing Status
Water Delisted
Attainable Use
Priority
Delisted 2020
Designated Use
303(d) ID
364
Listing Date
4/1/1998
Impaired Water Notes
This listing was part of a set removed from the impaired waters list due to a change in fish consumption advisory levels in 2001. In 2001 Wisconsin DNR put into effect a statewide fish consumption advisory for mercury due to atmospheric deposition. Most of the lakes removed from the specific fish consumption advisories list in 2001 were not removed from the impaired waters list even though the thresholds had changed. For the 2020 assessment process WDNR requested delisting of 91 waters with residual mercury listings from prior to 2001. This request was approved by US EPA.
Date
9/4/2018