The MS4 system may include such structures as storm pipes, catch basins, storm manholes, trench drains, roadside swales and cross drains, conveyance channels, detention ponds, infiltration basins, rain gardens or other structures designated for the collection, storage and conveyance of stormwater runoff. ![]() An MS4 collects and conveys only storm water runoff and conveys it into streams, rivers, lakes, wetlands or other natural or man-made receiving waters within the Commonwealth of Pennsylvania. An MS4 is defined as a collection and conveyance system or a group of collection and conveyance systems owned, operated and maintained by a state, city, township, borough or other public entity. MS4 is an acronym for a Municipal Separate Storm Sewer System. This webpage provides general information on storm water and on the Township’s MS4 stormwater program. This program was initiated by a state-wide mandate for small- to medium-sized communities with MS4s, such as Derry Township, to be permitted under the Pennsylvania Department of Environmental Protection’s (PADEP’s) National Pollution Discharge Elimination System (NPDES) Phase II permit program. ![]() In order to protect our natural waterways, Derry Township has implemented a program to regulate the storm water that is intercepted by its municipal separate storm sewer system, or MS4. Derry Township recognizes that storm water is a very important natural resource that provides a source for our drinking water supplies, water for our crops, lawns and gardens, and a replenishment of our streams, ponds and lakes which in turn provide recreation opportunities and enhanced aesthetic value to our community.
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