My trust in any federal agency telling the truth about this is zero. Especially the EPA.
The pertinent point is not that a federal agency made a decision, but that they used relevant science to inform the decision.
The EPA certainly deserves every word of criticism it gets when it makes and enforces policies based on political narratives. However, it should be supported when it makes decisions based on genuine science.
Investigating cancer clusters just because they are clusters is a waste of taxpayer money (such investigations can cost millions). Anyone familiar with statistics knows that random distribution causes clusters and bare patches; random is not an even dispersal.