Requires the Secretary of the Army, through the Chief of Engineers, to stop discharging water from Lake Okeechobee through the S-308 and S-80 lock-and-dam structures whenever microcystin levels exceed the EPA’s recommended maximum for recreational waters. The determination may be based on water tests conducted by the Secretary, another federal agency, or the State of Florida and uses the EPA guidance cited (84 Fed. Reg. 26413 or successor criteria).