Municipal Separate Stormsewer System Permit (MS4)


Support for small MS4s and large MS4s including:

  • Minimum Control Measures (MCM) support

  • Illicit discharge detection and elimination (IDDE), planning and execution

  • Stormwater BMP facility inspections (for post construction stormwater management)

    • VADEQ Stormwater BMP Inspector​

    • Confined Space Entry Certified

  • Public education and outreach

  • Public involvement and participation

  • Erosion and Sediment Control (ESC) inspection support for construction site stormwater runoff control

    • Maryland State Highway Administration Yellow Card and Maryland Department of the Environment Green Card

    • VADEQ Erosion and Sediment Control Inspector

  • Pollution Prevention and Good Housekeeping audits and training

  • Annual reporting support

  • TMDL planning, Watershed Implementation Plans, Chesapeake Bay and local TMDLs, Impervious Acre Treated (IAT)​

Streams and Forests

  • Maryland Forest Stand Delineations, Qualified Professional

  • Maryland Forest Conservation Plans, Qualified Professional

  • Stream benthic invertebrate sampling (MD DNR MBSS Certified)

  • Steam physical habitat assessments (MD DNR MBSS Certified)

  • Stream restoration post-construction monitoring / inspections & crediting analysis


  • White papers, state-of-the-science reports, literature reviews

  • English to Spanish translations for Spanish-speaking community


Industrial stormwater permit


12-SW, 12-SW-A, 20-SW, VAR05, MSGP


We provide support for federal facilities, state, county and local governments, school systems, universities, wastewater treatment plants (WWTPs), landfills, recycling facilities, compositing facilities and private industrial sites

  • Complete, system-wide audits

  • Stormwater pollution prevention plans (SWPPP, P3) and updates

  • Annual trainings for SWPPP team and general staff

  • Testing for SWPPP team members and site staff

  • Annual and quarterly inspections

  • Stormwater sampling

  • Stormwater BMP treatment facility inspections

  • Stormwater BMP treatment facility conceptual designs and prioritization to meet TMDLs and Chesapeake Bay Restoration requirements / impervious cover treatment requirements