Stormwater runoff is generated when precipitation from rain and snowmelt flows over land or impervious surfaces and does not percolate into the ground. As the runoff flows over the land or impervious surfaces (paved streets, parking lots, and building rooftops), it accumulates debris, chemicals, sediment or other pollutants that could adversely affect water quality if the runoff is discharged untreated. The primary method to control stormwater discharges is the use of best management practices (BMPs).

Municipal Separate Storm Sewer Systems (MS4)
As part of the Clean Water Act, the U.S. Environmental Protectionphoto of Valley Center Park basin Agency (US EPA) has developed stormwater management regulations to improve water quality. The Township is required to apply for a National Pollutant Discharge Elimination System (NPDES) permit for its Municipal Separate Storm Sewer System (MS4), which is administered by the Pennsylvania Department of Environmental Protection.  Any municipality with a population of at least 5,000, including counties, must comply with the program.

The MS4 program is designed to literally "manage" stormwater, both by protecting storm water quality and by preventing high volumes of runoff from causing flooding in developed areas. The Township must also track the progress towards the goals of the permit and report  progress to the PA DEP on an annual basis.  

Lower Moreland is located within three distinct watersheds: Pennypack Creek, Neshaminy Creek, and Poquessing Creek. Per Act 167, the Township has adopted new ordinances to meet the stormwater requirements set forth by DEP.