Gov. Scott Walker has directed three state agencies to come up with ideas on how dairy farms can use manure digesters to protect water quality.

Walker announced during a stop in Kewaunee on Thursday that he has directed the Public Service Commission, Department of Agriculture, Trade and Consumer Protection and the Department of Natural Resources to come up with recommendations by Dec. 1 on how dairy farms in environmentally sensitive areas can use digester technology.

Kewaunee County is trying to deal with a groundwater pollution issue that some environmentalists say is caused by large-scale farms. A study released last year found 34 percent of wells tested in the county had unsafe levels of nitrates and bacteria. About 2 percent of tested wells were contaminated with E. coli.