Municipal Separate Storm Sewer System

What is Stormwater Management?

Stormwater is the natural source of freshwater that originates during precipitation events. When it lands on the ground, it infiltrates and recharges the aquifers that we get our drinking water from and rehydrates the plants and animals that make up our food.

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.

Graphic Showing Percentage of Surface Runoff on a Variety of Surfaces: Good Ground Cover 2%, Fair Ground Cover 14%, Poor Ground Cover 73%, Bare Ground Cover 85%, Paved or Impervious Surface 98 to 100%

Stormwater Management in the Borough

Polluted stormwater is commonly transferred through Separate Storm Sewer Systems (MS4s), from which it is often discharged untreated into water bodies. Population growth and the development of urban/urbanized areas are major contributors to the number of pollutants in the runoff as well as the volume and rate of runoff from impervious surfaces. Together, they can cause changes in hydrology and water quality that result in habitat modification and loss, increased flooding, decreased aquatic biological diversity, and increased sedimentation and erosion.

The National Pollutant Discharge Elimination System  (NPDES) permit helps to prevent and control this discharge. Municipalities who have a separate storm sewer systems (MS4) from sanitary sewer systems must have a stormwater permit and are required by the Department of Environmental Protection (DEP) and the Environmental Protection Agency (EPA) to develop and implement a stormwater management program to reduce stormwater runoff and prohibit illicit discharge.

MS4 Partner Seal

The State College Borough is an MS4 Partner. The Public Works Department monitors stormwater management according to the Borough's Stormwater Ordinance (Borough Codes, Chapter XIV, Part B) and under the NPDES Phase II Permit.

Minimum Control Measures

Our stormwater management program includes six minimum control measures (MCM):

  • Construction and post-construction runoff management
  • Good housekeeping/general pollution prevention
  • Illicit discharge detection and elimination
  • Public education
  • Public involvement

The following documents provide more information on how the Borough will operate its core stormwater management programs:

Not Quite Quenched?

All members of the State College community can help with these stormwater improvement efforts. Check out these links for more on stormwater: