MS4 Stormwater Management


MS4 Stormwater Management What Is It and Why Should We Care?

Municipal Separate Storm Sewer Systems (MS4) are systems of publically owned pipes, roads, and ditches that transport stormwater runoff to local waterways. In areas that the waterways have been designated “impaired”, municipalities are mandated by the federal government to have permitting and a plan in place to improve the water quality of these impaired waterways.

Monroe Twp. has 2 impaired streams within our borders, Trindle Springs Run and Yellow Breeches Creek. It is our goal to educate residents, especially those living in the areas surrounding these impaired waters, on what they can do to help reduce further pollution and improve the water quality of these waterways.

10 Things You can Do to Prevent Stormwater Runoff Pollution

  • Use fertilizers sparingly and sweep up driveways, sidewalks and gutter
  • Never dump anything down storm drains or in streams
  • Vegetate bare spots in your yard
  • Compost your yard waste
  • Use least toxic pesticides, follow labels, and learn how to prevent pest problems
  • Direct downspouts away from paved surfaces, consider a rain garden to capture runoff
  • Take your car to the car wash instead of washing it in the driveway
  • Check your car for leaks and recycle your motor oil
  • Pick up after your pet
  • Have your septic tank pumped and system inspected regularly

Municipal Separate Storm Sewer System (MS4) - Links


the what, why and how of a downspout planter

Illicit Discharge

Illicit Dicharges are any direct or indirect non-stormwater discharges to the storm drain system.  There are many things that do not belong in our storm drains and streams. If you see something that does not seem right, report it to the Township for investigation at 717-258-6642 or 717-697-4613 (press 6 in the auto attendant menu) or complete and submit the reporting form found below via email or U.S. Mail. 
***Please note, a few activities are exempt from this definition of illicit discharge and are allowed; these exempt activities include: water line flushing, landscape irrigation/lawn watering, non-commercial vehicle washing, fire fighting activities, and dye testing (dye testing requires written notification to the Township).


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