The following discharges are exempt from discharge prohibitions established
by this Part 2, unless the Department or the municipality has determined
them to be substantial contributors of pollutants: water line flushing
or other potable water sources, landscape irrigation or lawn watering,
existing diverted stream flows, rising groundwater, uncontaminated
groundwater infiltration to storm drains, uncontaminated pumped groundwater,
foundation or footing drains, crawl space or basement sump pumps,
air-conditioning condensate, irrigation water, springs, water from
individual residential car washing, natural riparian habitat or wetland
flows, dechlorinated swimming pool discharges, residential street
wash water, water from firefighting activities, and any other water
source not containing pollutants. Such exempt discharges shall be
made in accordance with an appropriate plan for reducing pollutants.