EPA eyed oil and milk spills as the same hazard
By US Chamber of Commerce 
The Environmental Protection Agency (EPA) was considering regulating spilled milk the same as an oil spill as part of its spill prevention regulatory program. Milk contains a percentage of animal fat, which is a nonpetroleum oil. Dairy farmers would have been responsible for developing a spill prevention plan equivalent to an oil spill prevention plan. The EPA recently agreed to exempt milk spills from the rules.
For the source of the EPA milk and oil regulation consideration see: The Post-Star, February 16, 2011