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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Document Center

The Document Center provides easy access to public documents. Click on one of the categories below to see related documents or use the search function.

Categories always sorted by seq (sub-categories sorted within each category)
Documents sorted by _RECORDID in Descending Order within category


  • 2022 - 2023 MS4 Annual Report
    document _recordid 2027
  • 2021-2022 MS4 Annual Report
    document _recordid 1402
  • 2020-2021 MS4 Annual Report
    document _recordid 1304
  • 2019-2020 MS4 Annual Report
    document _recordid 1099
  • 2018-2019 MS4 Annual Report
    document _recordid 915
  • 2017-2018 MS4 Annual Report
    document _recordid 913
  • 2015-2016 MS4 Annual Report1
    document _recordid 53
  • 2016 - 2017 MS4 Annual Report - 2017-04-27
    document _recordid 52

MS4 Ordinance Links3 documents

  • Stormwater Fee Ordinance - 2020-01
    document _recordid 1084
  • Illicit Discharge Ordinanace 2014-04
    document _recordid 56
  • Stormwater Management Ordinance 2022-01
    document _recordid 55

Pollutant Reduction Plan1 document

  • Monroe Township's Pollutant Reduction Plan 2017-07-13
    document _recordid 58

Cumberland County Conservation District1 document

  • Rain Barrels Why & How
    document _recordid 60

Illicit Discharge1 document

  • Illicit Discharge Reporting Form
    document _recordid 164

Stormwater Billing Newsletter Inserts7 documents

  • January 2024 - Billing
    document _recordid 1985
  • July 2023 - Billing
    document _recordid 1984
  • July 2022 - Billing
    document _recordid 1982
  • January 2022 - Billing
    document _recordid 1980
  • July 2021 - Billing
    document _recordid 1255
  • January 2021 - Billing
    document _recordid 1254
  • October 2020 - Initial Billing
    document _recordid 1140