About Duffield Associates, Inc.
Duffield Associates, Inc. is an award-winning engineering and science consulting firm specializing in civil, water resources, environmental, and geotechnical engineering, construction review and testing services. Established in 1976, Duffield has grown to include a professional and technical staff of over 90 individuals. The firm’s headquarters is located in a historic barn and farmhouse in Pike C...reek Valley outside of Wilmington, Delaware. We have regional offices in Georgetown and Dover, Delaware, Center City Philadelphia and Carlisle, Pennsylvania and Bel Air, Maryland.