MS4 services

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CEI is currently assisting over 20 communities in Massachusetts and New Hampshire with compliance with the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4).  Recent tasks and services to address MS4 requirements include preparation or completion of the following materials:


  • Notice of Intent (NOI)
  • Stormwater Management Program (SWMP) Plan
  • Public Education
  • Illicit Discharge, Detection, and Elimination (IDDE) Plan
  • GIS System Mapping
  • Regulatory Evaluation and Assistance
  • Peer Review
  • Construction Inspections
  • Facilities Stormwater Pollution Prevention Plans (SWPPPs)
  • Operation and Maintenance (O&M) Plans
  • BMP Inspections
  • IDDE and BMP Training
  • Watershed Plan
  • Hydraulic Analyses
  • Stormwater BMP Design
  • Capital Improvement Plan
  • Grant Funding
  • Stormwater Funding Analysis           
  • MS4 Annual Reports
  • Meeting Facilitation/Public Meetings


In addition to MS4 compliance activities, CEI has helped municipalities, state and federal regulatory agencies and private owners better manage stormwater and reduce flood impacts. CEI engineers and scientists have served on numerous state boards to facilitate better, more effective stormwater engineering designs that solve surface flooding problems as well as address dwindling groundwater recharge in areas.

The M$4CASTER™ is a tool developed by CEI for pricing total, consultant, and municipal costs for the MA MS4 NPDES Phase II Permit.


  • Run 'What If' scenarios to reduce costs
  • Community specific input for custom cost estimates
  • Summary of major program components
  • Schedule for implementation by year
  • Incorporate work completed to date into cost matrix

For any questions or if you'd like additional information on CEI's MS4 services, please contact Nick Cristofori, P.E. at [email protected].