The stormwater requirements of the federal Clean Water Act are administered under the Pennsylvania Department of Environmental Protection’s Municipal Separate Storm Sewer (MS4) Program. In December 2002, DEP issued a General Permit (“PAG-13”) for use by MS4s that fall under the National Pollutant Discharge Elimination System (NPDES) Phase II program, requiring the implementation of a stormwater management program for minimizing the impacts from runoff. Municipalities and other entities such as universities and prisons that meet certain standards must obtain NPDES permit coverage for discharges of stormwater from their municipal separate storm sewer systems (MS4s). Information regarding permit coverage and compliance information can be found on DEP’s Website.
Penn Township was notified of its designated as a small MS4 on July 6, 2016. A “Notice of Intent” (NOI) to discharge under the statewide General Permit was filed in September 2017 for the permit term beginning March 16, 2018.
Under the MS4 Program, permittees are required to incorporate the following six elements (known as minimum control measures, or MCMs) into their stormwater management programs:
•Public education and outreach
•Public involvement and participation
•Illicit discharge detection and elimination
•Construction site runoff control
•Post-construction stormwater management in new development and redevelopment
•Pollution prevention and good housekeeping for municipal operations and maintenance
Each MCM has a series of suggested best management practices (BMPs) associated with it to guide permit holders in program development, tracking, and reporting.