MS4

Stormwater Management – MS4

When it rains, do you know where the stormwater goes? Stormwater runs off of impervious surfaces such as rooftops, paved surfaces such as roads and parking lots and enters into the storm sewer system. Ultimately, stormwater drains through the system and discharges into our local lakes and streams. 

The waterways of South Middleton Township are within the Susquehanna River Basin so everything that drains through the township eventually makes its way to the Susquehanna River and the Chesapeake Bay.

Stormwater Runoff diagram (JPG)

What is an MS4?

MS4 is short for Municipal Separate Storm Sewer System. MS4s are conveyances or systems of conveyances including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains that are owned or operated by a public entity, are designed or used for collecting or conveying stormwater, and are not a combined sewer or part of a publicly owned treatment works.

South Middleton Township is bound by U.S. Environmental Protection Agency (EPA) regulations for an MS4 since a portion of the municipality lies within an urbanized area (UA), as determined by the U.S. Census Bureau.

Township Requirements Under the MS4 Permit

As part of the terms of the MS4 permit, South Middleton Township is required to focus on six minimum control measures (MCMs) as part of the Township’s Stormwater Management Program.

Minimum Control Measures (MCM)

  • MCM 1: Public Education and Outreach
  • MCM 2: Public Participation and Involvement
  • MCM 3: Illicit Discharge Detection and Elimination
  • MCM 4: Construction Site Runoff Control
  • MCM 5: Post-Construction Runoff Control
  • MCM 6: Pollution Prevention/Good Housekeeping

We Can All Be Part of the Solution!

By practicing healthy household habits, homeowners can keep common pollutants like pesticides, pet waste, grass clippings, and automotive fluids off the ground and out of stormwater. More information is provided in the following links including information on how you can help!

Where are the MS4 areas within South Middleton Township?

South Middleton Township MS4 Urbanized Areas (JPG)

Contact Information

To get more information on Stormwater Management and South Middleton Township’s MS4 efforts, email Kelly Kurtas, MS4 Coordinator, or call 717-258-5324.