Still not that simple:

> The Jackson plaintiffs alleged that their city government deliberately withheld information about the water’s toxicity, and exacerbated the problem through a series of boil-water notices - a practice that can eliminate some bacterial contamination, but also concentrates lead in water. Engelhardt stated there is no “constitutional right to truthful information from officials during a public health crisis”

The constitutional question (and note that state Constitutions, e.g. Massachusetts, may instead cover it) is just one piece of the mess.