The Wisconsin Department of Natural Resources (DNR) has strict guidelines for the disposal of most solid waste, but under current law, it has no jurisdiction over household waste, which can include everything from leftovers and dirty diapers to batteries and chemicals.

At the end of November 2009, the Wisconsin State Representative introduced legislation that would remove the exemption keeping the DNR from regulating household waste. If it becomes law, it would essentially ban the burying of household waste, protecting groundwater supplies and property rights,

More information is available here:
http://www.wisconsinrapidstribune.com/article/20091115/CWS0101/911150491/1982/Legislation-would-put-end-to-burying-garbage--in-backyards