There are no regulations in Libertarianville. If you are unfamiliar with their philosophy, they have this concept called the NAP(non-aggression principle).

The generally(this might be too strong a word to use with Libertarians) accepted interpretation of the NAP is that as long as I do not initiate violence against someone, my behavior is acceptable, and that violence is only acceptable against someone if they break the NAP first.

This breaks down in Libertarian communities as they cannot agree on common deductions of things like what counts as “someone”, what counts as “violence”, whether you have rights to the land if you’re not using it(Georgists/homesteaders), or if indirect damages like pollution are a violation of the NAP.

The idea that a libertarian community would let someone dump toxins into their neighborhood and leave without cleaning it up or compensating the hurt is completely plausible. Half of the community would not believe he directly caused the cancer unless he injected it into you, and you should have been more careful about what water you drink, and the other half’s only recourse would be to fight the first half.