Environmental Protection Agency ( EPA), are categorized by population, and Lower Paxton Township is defined as a small MS4.

Municipal Separate Storm Sewer Systems ( MS4), as defined by the U.S. What is a Municipal Separate Storm Sewer System (MS4)? Examples of pollutants are motor oil or fuels from vehicles, soils, and dust, winter de-icing materials, and spilled or dumped chemicals. During precipitation events in urban areas, rainwater picks up and transports pollutants through storm water systems, and ultimately to waters of the Commonwealth. For example, grass fields are more pervious and absorb more runoff than an asphalt parking lot. When all factors are equal, runoff increases as the surface becomes more impervious. When something is pervious, it has the ability to allow a liquid to pass through. ExamplesĮxamples of this include: the water that flows off a building's roof when it rains (runoff from an impervious surface) the water that flows into streams when snow on the ground melts (runoff from a semi-pervious surface) and the water that flows from a vegetated surface when rainfall exceeds the rate at which it can infiltrate into the soil (runoff from a pervious surface). Storm water is precipitation that flows across a surface to a storm drain system or receiving waters. Environmental Protection Agency ( EPA) as urban runoff and snowmelt runoff, consisting only of those discharges which originate from precipitation events. What is storm water? Is it the puddle our children splash in or maybe the little stream along the road after a downpour that runs into storm drains?

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