"Quite incredibly, the EPA issued a positive report on May 1, 2012 regarding the safety and toxicity of various dispersants use in the BP Gulf Oil Spill. Included in this assessment was the use of Corexit.
This report "indicated that all eight dispersants had roughly the same toxicity, and all fell into the "practically non-toxic" or "slightly toxic" category. Scientists found that none of the eight dispersants displayed endocrine-disrupting activity of "biological significance." The same report went on to say that "dispersant-oil mixtures were generally no more toxic to the aquatic test species than oil alone."
The first question that jumps out for those who have researched this subject with any degree of thoroughness is how this recent report fails to reconcile with previous studies performed by the EPA. Here is some test data retrieved from the EPA website that was posted previous to the BP Gulf Oil Spill."