Pollutant Reduction Plans – Planning for Success, A recent PADEP requirement of the Municipal Separate Storm Sewer System (MS4) permit cycle is the development of a Pollutant Reduction Plan (PRP) and/or Total Maximum Daily Load (TMDL) Strategy Plan to reduce pollutant loading in impaired receiving waterways.  Those pollutants are from non-point sources, and are primarily sediment and nutrients washed from the land into streams.  The objective is simple: improving water quality.