Minnesota and eight other states are suing the Environmental Protection Agency over a rule the states say allows water pollution.
Minnesota Attorney General Lori Swanson says the EPA is allowing water to flow from one body of water to another without regulation.
Minnesota has been fighting the release of water from North Dakota's Devils Lake into the Red River. Minnesota contends the water from Devils Lake is polluted.
Swanson says the EPA rule means Minnesota is powerless to stop the polluted water.