Minimum Control Measure #4: Construction Site Runoff Control

Illicit Discharge
Sediment is the primary pollutant of concern associated with construction site stormwater runoff.  Sediment-polluted stormwater can cause physical, chemical, and biological damage to waterways.  Proper installation and maintenance  of erosion and sediment control best management practices is essential to protect our waterways.
Construction Site Runoff Control is one of the 6 minimum control measures (MCMs) required under the small MS4 program*.  The goal of the Construction Site Runoff Control MCM is to protect our waterways from stormwater-related pollution that can result from construction activities.  Four (4) best management practices (BMPs) are required under this MCM.

Under Chapter 102, Erosion and Sediment (E&S) Control, County Conservation Districts and/or DEP must issue a permit for earth disturbance activities greater than 1 acre.  If the small MS4 permittee elects to use their participation in the Chapter 102 program as a Qualifying Local Program (QLP) under their MS4 permit requirements, then MCM #4 BMPs 1 -3 are automatically accounted for. Read more about all the BMPs associated with this MCM below.

BMP #1 –If an NPDES permit is required for earth disturbance activities, do not issue a building permit or approval until confirmation that a valid NPDES permit is obtained.

BMP #2 – Notify DEP or county conservation district (CCD) within five days of the receipt of an application for a permit involving an earth disturbance activity consisting of one acre or more.

Common Construction Pollutants
  • Sediment
  • Trash
  • Sanitary Waste
  • Phosphorus
  • Nitrogen
  • Pesticides
  • Oil and Grease
  • Concrete Truck Washout
  • Construction Chemicals

BMP #3 – Enact, implement, and enforce an ordinance or SOP to require the implementation of erosion and sediment control BMPS, as well as sanctions to ensure compliance. All municipal permittees shall submit a copy of an ordinance that is consistent with DPE’s 2022 Model Stormwater Management Ordinance. Permittees that lack the authority to enact ordinances shall develop, implement, and enforce an SOP to require the implementation and maintenance of E&S control BMPs.

Explore the links below to learn more about MCM #4, creating pollution prevention plans, webinars, and more. 

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