2.A person or organization that allows industrial waste or other harmful substances to be released into the environment.
‘Water quality standards, therefore, focus on the overall water quality of a particular water body, unlike effluent limitations, which focus on particular kinds of _dischargers_ and the pollutants they discharge.’
‘As a favor to utility and coal industries, the country’s largest mercury _dischargers_ , the organisation sat for nine months on a report exposing the catastrophic impact on children’s health of mercury, finally releasing it in February 2003.’