Well, at least of the dairy kind:
New Environmental Protection Agency regulations treat spilled milk like oil, requiring farmers to build extra storage tanks and form emergency spill plans....
The EPA regulations state that “milk typically contains a percentage of animal fat, which is a non-petroleum oil. Thus, containers storing milk are subject to the Oil Spill Prevention, Control and Countermeasure Program rule when they meet the applicability criteria.”
Peter Daining of the Holland Sentinel (Holland, MI) has a report, including predictions that smaller dairy producers could be driven out of business by the cost of the containment rules.