From the Johnson Creek Watershed Council …

What is the Backyard Habitat Certification Program?
The Johnson Creek Watershed Council has joined forces with the Audubon Society of Portland and the Columbia Land Trust to bring the Backyard Habitat Certification Program to residents of the Johnson Creek Watershed. This program provides technical assistance to small lot, private property owners in the City of Portland to restore native wildlife habitat in their backyards. The program focuses on the removal of aggressive weeds, naturescaping with native plants, stormwater management and wildlife stewardship.

For more information see the Habitat Certification Program at the Audubon website.