Welcome to Tetra Tech Rizzo

Since it was founded in 1983 as Rizzo Associates, Inc., Tetra Tech Rizzo has grown from a local, three-person environmental and engineering services firm to a full-service, $40 million operating unit within a $2.1 billion worldwide consulting firm. As a New England-based firm, we are proud to provide civil engineering; transportation planning and design; assessment, remediation, compliance; and natural resource services to local, national, and international clients.

Tetra Tech Rizzo is a division of Tetra Tech, a leading provider of consulting, engineering, and technical services, based in Pasadena, California. Tetra Tech is a publicly traded company, with more than 10,000 associates in over 250 offices worldwide. Engineering News Record ranks Tetra Tech the 8th largest design firm.