The language which concerns so many groups in agriculture is that EPA believes that all bodies of water are somehow physically, chemically and biologically connected to downstream Waters of the United States.
Check it out:

The EPA has just released a new definition of “Waters of the United States.” Critics are calling this the biggest government land grab ever. Senator David Vitter, R-La., and a member of the Senate Environment and Public Works Committee said, “The…(proposed) rule may be one of the most significant private property grabs in U. S. history.” Senator Murkowski, R-Alaska, claimed the EPA proposal “could result in serious collateral damage to our economy.” She also said, “If EPA is not careful, this rule could effectively give the federal government control of nearly all of our state – and prove to be a showstopper for both traditional access and new development.

This quote may apply to most of the states of the Union, and not just Alaska. This EPA proposal, if promulgated, will give it zoning authority over land use.