Carollo's Northwest Region is comprised of offices in Seattle, Portland, and Boise. The three offices have a combined staff of over 70 people, including registered engineers who specialize in all aspects of water, wastewater, and infrastructure engineering. We are familiar with the local conditions and the political and regulatory climates found in our region. Many communities in the region are facing critical decisions about key components of their water and wastewater systems as a result of aging facilities, stricter regulatory requirements, and/or rapid growth. We work closely with these communities to find cost effective solutions that meet their needs.

Our Boise office also includes Carollo's Water Research Group, founded in 1997, which provides research geared toward developing emerging engineering technology into successful full-scale applications. The group includes PhDs and other professional staff, who serve as a company-wide resource for evaluating water quality and treatability data, performing studies, tailoring design solutions to water quality issues, and addressing regulatory compliance concerns.