Bud's Offshore Energy (BOE)

Link to EPA Release. The results are not surprising.

These results confirm that the dispersant used in response to the oil spill in the Gulf, Corexit 9500A, is generally no more or less toxic than the other available alternatives.

Good, timely work by EPA.  Also:

EPA believes dispersants should only be used sparingly and when absolutely necessary. Since the well was capped, only 200 gallons of dispersant have been applied to the Gulf, but constant monitoring continues.