User blog comment:ToyStoryFan123/Who Was to Blame for The SImpsons Movie's Events?/@comment-4319402-20131102180304/@comment-2249686-20131117171851

In the long run, yes it was SNPP, but in the short term, it was Marge for taking Grampa's words so seriously, if she hadn't made Homer dispose of the waste, he wouldn't have dumped it in the lake.

Also, with Lisa's clean up, the Power Plant closed its sewage pipes.