sentences:  By 1982, the plant was overloaded by the rapid growth of the city and regularly discharged effluent into the creek, not all of which met state standards for discharge.Twelve years later in June 1993, the park ban on swimming was finally lifted.This was due to the closure of the Williamson Creek Wastewater Treatment Plant in 1986, Austin's enactment of a comprehensive watershed ordinance and starting a citywide hazardous chemicals collection program.