Requires certain water purveyors to identify, and use, alternative water supply source when perfluoralkyl or polyfluoroalkyl substances exceed maximum contaminant levels.

S 2847 requires New Jersey's public community water systems to identify an alternative water source within 120 days of the bill's enactment. If levels of PFAS (perfluoralkyl and polyfluoroalkyl substances) exceed state-established maximum contaminant levels in drinking water, the system must immediately switch to the alternative source to maintain safe water access. This applies to all public community water systems and ensures uninterrupted water supply during PFAS contamination events. The bill does not require reducing PFAS levels but mandates preparedness for rapid response.