“When I made the decision to start this company, one thing was very clear to me – I knew there was absolutely no advantage, competitive or otherwise, to simply adopting ‘accepted industry practices’.

“I think the people we do business with – both directly and indirectly – will agree that we’ve always been noted for innovation. And, as we’ve proven over more than a decade, our innovative practices translate not only to increased efficiencies and cost savings, but to enhanced quality assurance as well.

“From the outset, I was determined to build this company on the strength of our expertise, our reliability, and our absolute integrity. And, in a very real sense, those qualities continue to reflect what SDE is all about.”

Stacey DePasquale, P.E., BCEE, CPSWQ, President

Core Services: Storm Water and Water Quality | Wastewater Collection Systems | Construction Oversight and Management


  • Boston Water & Sewer Commission
  • CH2M Hill
  • Woodard & Curran
  • Stantec
  • CDM Smith
  • Tighe & Bond
  • Kleinfelder
  • Brown and Caldwell
  • Fay, Spofford & Thorndike
  • Wright-Pierce
  • Town of Watertown
  • City of Marlborough



  • Citywide Illegal Connection Investigation, Boston, MA
  • Illicit┬áDischarge Detection and Elimination, Springfield, MA
  • Illicit Discharge Detection and Elimination, Lawrence, MA
  • Illicit Discharge Detection and Elimination, Medford, MA
  • Sanitary Sewer Evaluation Survey, Lawrence, MA
  • Lawrence Airport Stormwater Design and Permitting, Lawrence, MA
  • Minute Man Air Field Stormwater Design and Permitting, Stow, MA
  • Citywide Analysis of Infiltration and Inflow, Boston, MA
  • Water Meter Replacement and AMR System, Lowell, MA
  • Construction Services for Annual Town Contracts, Watertown, MA
  • Stormwater Outfall Sampling, Newton, MA
  • Phase 2 Wastewater Facilities Plan, Ridgefield, CT
  • Millham Water Treatment Plant Upgrades, Marlborough, MA