MADISON, Wis. (AP) — Federal regulators plan to visit Wisconsin Department of Natural Resources headquarters this week to investigate claims the agency is failing to enforcing water pollution laws and regulations.

Midwest Environmental Advocates and 16 individuals petitioned the U.S. Environmental Protection Agency to review water regulations in the state to ensure the DNR is complying with the Clean Water Act. The EPA in 2011 cited 75 deficiencies in how DNR handles water regulation.