This Act may be cited as the Toxic Health Threat Warning Act of 2025.

(a) Determination Before any planned release of water from a flood risk management structure, the Secretary shall determine whether the water is contaminated with cyanotoxins, based on tests conducted by the Secretary, another Federal agency, or the State in which the flood risk management structure is located. (b) Notification If the Secretary determines under subsection (a) that water to be released from a flood risk management structure contains cyanotoxins at levels greater than 8 parts-per-billion, the Secretary shall notify the public and affected governments of the determination and planned release, and any potential effects on human health, before releasing the water. (c) Definitions In this section: (1) Affected government The term affected government means a State, local, or Tribal government with jurisdiction over an area that will be affected by a release of water from a flood risk management structure. (2) Secretary The term Secretary means the Secretary of the Army, acting through the Chief of Engineers.