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What is an
What is an MS4 Program?
Municipalities throughout the country are under federal mandate to develop a storm water management program to reduce pollution impacts from stormwater runoff. An MS4 is made up of drainage systems including streets, catch basins, curbs, gutters, ponds, ditches, man– made channels and storm pipes owned by a state, county, city, town, township, borough or other public entity. Polluted runoff is often transported through municipal drainage systems until it eventually discharges into streams, lakes, and rivers used for swimming, fishing and providing drinking water. This water is not treated or cleaned in any way and does not go to a wastewater treatment plant. If you like to fish, swim or boat, pollutants will affect you.
MS4 programs are intended to improve our nation’s surface waters by reducing the quantities of pollutants that are picked up by runoff and transported into the storm sewer systems during rainfall events. As part of the MS4 Program, municipalities hold a permit to discharge stormwater into local waterways. Lower Nazareth Township was issued an MS4 permit through the Pennsylvania Department of Environmental Protection (PADEP) and the Federal Environmental Protection Agency. This permit requires Lower Nazareth Township to implement and maintain a stormwater management program that (1) reduces the discharge of pollutants to the maximum extent possible; (2) protects water quality; and (3) satisfies the water quality requirements of the Federal Clean Water Act.