The following discharges are exempt from discharge
prohibitions established by this Part 1, unless the Department or
the municipality has determined them to be substantial contributors
of pollutants: water line flushing or other potable water sources,
(water line flushing of superchlorinated water used to disinfect water
mains shall be dechlorinated), 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 fire-fighting activities, and any other water
source not containing pollutants. Such exempt discharges shall be
made in accordance with an appropriate plan for reducing pollutants.