The Tier A MS4 NJPDES permit requires that each Tier A Municipality develop, implement, update and maintain an MS4 stormwater program. The stormwater program is described in the municipality’s written Stormwater Pollution Prevention Plan (SPPP), which is the primary plan required by the permit. The SPPP describes how the municipality will implement each permit requirement and provides a place for record keeping and documenting when permit requirements were met.