Government supervisors actually do go around testing and inspecting stuff all the time, to no positive effect. Jumping on the commie bandwagon for more oversight and regulation is just the knee-jerk reaction these liberal trash mongers are hoping for.
It's minor, the expected outcome everyone paying attention knew was coming from day one. The marshes are fucked(who'd a thunk?), the gulf proper largely didn't give a shit. Minor mutations in bottom feeders and some of the more sensitive species, particularly ones that visit the coast line and thus got more contamination, are having issues. This is pure media hype, economic impact is negligible, environmental impact isn't even as bad as the Exxon Valdez spill was.
It would be nice if they bothered to investigate it though. They should have followed the paper trail, starting with the inspector that found and reported the problem, to whatever asshole manager it was along the chain that buried it to make his quota look better. That particular POS needs to be in jail for manslaughter at the least, and it's all just sitting there in old work logs waiting to be used. Unfortunately, prosecuting people responsible for criminal activities doesn't get them anywhere on the big government agenda, so they don't bother.