Should rural Iowa ban Polk County in response for legal case?

The Raccoon River is getting polluted, and Polk county has to build a new water treatment facility. They want to sue some smaller counties because they believe that we're the reason why it's polluted. This way they can pay for the new water treatment facility. The counties that they are blaming are Buena Vista County, Sac County, and Calhoun County. I don't think that this is fair, because it's not just those three counties doing this. It's caused by a lot of counties. I think that we need to stand up for ourselves so the bigger counties don't pick on us.