Nor was "general Welfare" some contentless phrase at the Founding. Protection, safety, prosperity, happiness, and the well being of the political community were all part of the contemporary vocabulary surrounding the public good. As Madison wrote in Federalist 45, “the public good, the real welfare of the great body of the people is the supreme object to be pursued”.
All government powers carry some risk of abuse. But, as Joseph Story put it, “Neither rulers, nor any other functionaries, much less any private persons, have a right to cripple it, because it is according to their own views inconvenient, or dangerous, unwise or impolitic, of narrow limits, or of wide influence.”
The OP is about a federal ruling saying clean water is not a constitutional right, no? And if you're disagreeing you're saying it should be a positive federal right in interpretation if not declaration, implying power of enforcement.