Relating to notice provided to certain public drinking water supply systems before water quality testing.

HB 5206 requires Texas water quality agencies to provide public drinking water systems (specifically those using underground water sources) with up to 24 hours' notice before conducting water quality testing to investigate complaints about their water. This bill creates a clear procedural requirement for agencies to notify affected water systems in advance of testing related to public health concerns. The law takes effect September 1, 2025, and directly impacts water systems and the state agency responsible for water quality oversight.