Who We Are

Horsley Witten Group is a small business, full-service environmental science and engineering firm with offices located in Sandwich (Cape Cod), Newburyport , Massachusetts and Providence, Rhode Island. The firm was incorporated in 1988 and consists of a professional staff of over thirty engineers, surveyors, hydrogeologists, hydrologists, wetlands scientists, marine scientists, geologists, computer modelers, land use planners, environmental analysts, licensed site professionals and supporting personnel. Horsley Witten Group specializes in providing consulting services in sustainable development techniques, site design, coastal and watershed protection, hydrology, hydrogeology, engineering, land use regulation, and technical information transfer and training. Our clients include government agencies at the federal, state, tribal, regional, county, and municipal levels, as well as private sector organizations, non-profit organizations and individuals.

Horsley Witten Group is an interdisciplinary environmental services firm combining engineering and science with land use planning, economics, and public policy. Our corporate goal is to create innovative solutions to environmental problems by successfully integrating engineering, scientific and management skills.

Horsley Witten Group is nationally recognized for its ability to translate results of water quality, engineering, hydrogeologic, and land use investigations into policies, regulations and management strategies that can be readily implemented at the federal, state, tribal and local government levels. The success realized in all of our U.S. EPA and state level projects is a direct result of our knowledge of local and state regulatory issues and our understanding of the scientific and policy foundation behind these regulations.

Over the past eighteen years, approximately two-thirds of our client base has been in the public sector covering the entire range of community, county, state, federal and tribal governments. Our work in the private sector has been primarily in site design and permitting.

Currently, Horsley Witten Group holds a prime contract with U.S. EPA’s Headquarters Office of Groundwater and Drinking Water, entitled “Technical Support for the Underground Injection Control (UIC), Drinking Water and Source Water Protection Programs.”