> Plaintiffs allege1 that the City, through a series of acts and failures to act, caused lead to leach into Jackson’s drinking water. City officials then, despite the presence of lead in the water, incorrectly told residents that the water was safe to drink, despite knowing it likely was not.

This is the allegation. Doesn't sound much like "the constitution guarantees us safe drinking water," but rather "the constitution says our city government officials can't knowingly poison us and lie about it"