Carnation Wastewater Treatment Facility

Carnation, WA

This LEED Certified wastewater treatment facility was master planned and designed by MWA and Carollo Engineers to respond to its limited site area and historic context within a small bedroom community of Seattle.

The plant is designed to meet the city’s current and (phased) future needs. The small scale neighborhood plant, adjacent to a new housing development uses the advanced treatment technology of a membrane bioreactor to meet Class A, reclaimed water quality standards. Reclaimed water from the plant is used to create and enhance wetlands in state Chinook Bend Natural Area while eliminating adverse impacts to public health and the environment. The project is a truly unique public/private partnership to a greater environmental benefit.

Client: Carollo Engineers/King County, WA
Cost: $23 million
Completion: 2008
Awards: 2008 Small Project of the Year, WateReuse Association