I guess the DOJ saying not to fine these people is a nice gesture but in practice local fines don't mean anything in a situation like this unless the poors on the property are unlucky enough to be on a property that the municipality wants to lien and take for whatever reason.

Whatever the dollar number is, it's likely some insane punitive number (hundreds to thousands per day) that nobody could ever pay and never will actually be enforced, it's basically just a threat and you wind up going to court over it in the end or you fix it and they drop it or fine you a reasonable amount (thank the 8th amendment).

This sounds like a standoff situation. Municipality wants trailer park to pay for its own sewer. Trailer park can't afford it. Municipality fines them. Trailer park gives them the bird because they're so poor they're basically judgement proof. Municipality doesn't push the issue because if they take it and kick them all out then they will pick up the tab for remediating, etc, etc.