Sheboygan County, Wisconsin
Condition has improved over time; water is not impaired.
NotesCrystal Lake was placed on the 303(d) impaired waters list in 1998 due to mercury from atmospheric deposition and is proposed for removal based on 2001 updated Fish Consumption advisories.
This lake was assessed for phosphorus and algae in 2012, 2014, 2016, and 2018; no impairment was found.
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.