Municipal Separate Storm Sewer Systems (MS4) | Dawood Engineering Inc.

Municipal Separate Storm Sewer Systems (MS4)



The Federal Clean Water Act (CWA) requires municipalities in U.S. Census designated Urbanized Areas to own and operate Municipal Separate Storm Sewer Systems (MS4s).  Stormwater regulations associated with the CWA are administered under the MS4 Program by the Environmental Protection Agency (EPA). In Pennsylvania, the MS4 program is managed by the Pennsylvania Department of Protection (PADEP). The PADEP General Permit PAG-13 provides a streamlined process to meet the state and federal stormwater requirements. Operators of a regulated MS4 must obtain a National Pollutant Discharge Elimination System (NPDES) permit and develop and implement a stormwater management plan (SWMP) according to the details of their specific permit. Mandatory elements of the SWMP include six (6) Minimum Control Measures (MCMs); each MCM has a number of associated BMPs.

The MS4 program requires the MS4 owner/operator to implement a series of programs to reduce the discharge of pollutants from the storm sewer system to the maximum extent practicable in a manner that protects water quality. The Pennsylvania Code Chapter 93 sets the water quality standards for surface waters of the Commonwealth and these standards seek to protect the waters for aquatic life, water supply, recreation and fish consumption, and areas that need special protection. The MS4 program focuses on managing discharges into the waters of the Commonwealth by educating and implementing proper control measures and best management practices (BMPs).  (Source: Pennsylvania Department of Environmental Protection)

  • Stormwater Management Program Development
  • Post-Construction Stormwater Management Plans
  • Pollutant Reduction Plans
  • MS4 Notice of Intent Applications
  • MS4 Individual Permit Applications
  • NPDES Permit Applications
  • Stormwater Outfall Locating and Mapping
  • GIS Services
  • MS4 Related Inspections
  • MS4 Training