Storm Water Basic Information

The National Pollutant Discharge Elimination System (NPDES) Storm Water Program regulates storm water discharges from three potential sources: municipal separate storm sewer systems (MS4s), construction activities, and industrial activities. Most storm water discharges are considered point sources, and operators of these sources may be required to receive an NPDES permit before they can discharge. This permitting mechanism is designed to prevent storm water runoff from washing harmful pollutants into local surface waters such as streams, rivers, lakes or coastal waters.

Most states are authorized to implement the NPDES Storm Water Program and administer their own storm water permitting programs. EPA remains the permitting authority in a few states, territories and on most tribal lands. For these areas, EPA provides oversight and issues storm water permits

Why should we be concerned about stormwater runoff?

Runoff from rainstorms and snowmelt is the most significant source of water pollution today. Stormwater carries sediment, oil, grease, nitrogen, phosphorus, and other pollutants into storm drains and then, untreated, into nearby water bodies. Because most stormwater drainage systems provide no treatment, preventing contamination of stormwater is crucial to ensure that pollutants are not released into the environment. Municipal drinking water systems may face higher costs if they must treat water contaminated by stormwater runoff. Improperly managed stormwater runoff is also a leading cause of flooding, which can lead to property damage, cause road safety hazards, and clog catch basins and culverts with sediment and debris.

 For more information on  storm water management

Visit the DEP Website at http://www.depweb.state.pa.us