PFAS Fish Consumption

MADISON, Wis. – The Wisconsin Department of Natural Resources (DNR) and the Department of Health Services (DHS) today announced new consumption advisories for several fish species in Castle Rock Lake and Lake Mohawksin, both of which are segments of the Wisconsin River, following results of fish sampling.

Elevated levels of PFOS (perfluorooctane sulfonate), a type of PFAS (per- and polyfluoroalkyl substances), were detected in several fish species sampled from both Castle Rock Lake and Lake Mohawksin in March and April 2021, respectively. As a result, the DNR and DHS recommend the following consumption guidelines for anyone harvesting fish from those waterbodies:

CASTLE ROCK LAKE (Adams/Juneau Counties): Advisory is from the Petenwell Flowage Dam to the Castle Rock Lake Dam.

BLUEGILL General/Statewide* 1 meal/week
YELLOW PERCH General/Statewide* 1 meal/week
BLACK CRAPPIE General/Statewide* 1 meal/week
COMMON CARP 1 meal/month (PCBs) 1 meal/month (PCBs) (No change)