Storm Water Management

Stormwater runoff is generated from rain and snowmelt events that flow over land or impervious surfaces, such as paved streets, parking lots, and building rooftops, and does not soak into the ground. The runoff picks up pollutants like trash, chemicals, oils, and dirt/sediment that can harm our rivers, streams, lakes, and coastal waters. To protect these resources, communities, construction companies, industries, and others, use stormwater controls, known as best management practices (BMPs). These BMPs filter out pollutants and/or prevent pollution by controlling it at its source.

The NPDES stormwater program regulates some stormwater discharges from three potential sources: municipal separate storm sewer systems (MS4s), construction activities, and industrial activities. Operators of these sources might be required to obtain an NPDES permit before they can discharge stormwater. This permitting mechanism is designed to prevent stormwater runoff from washing harmful pollutants into local surface waters. (Source:

Rain gardens, like this one installed at the Terre Hill Park help to contain rain water before it enters the storm system.

For more information, see the following resources:

Informational Brochure on Stormwater

Stormwater PA

Chesapeake Bay Foundation

Center for Watershed Protection

Lancaster County Clean Water Consortium

Lancaster County Conservation District (LCCD)

Lancaster County Solid Waste Management Authority (LCSWMA)