In order to receive the award, wastewater plants must pass all environmental tests, turn in all state-required reports and avoid permit violations during the year.
The 2011 winners are:
- City of La Center Wastewater Treatment Plant
- City of Ridgefield Wastewater Treatment Plant
- Clark County/Salmon Creek Wastewater Treatment Plant
- City of Vancouver Marine Park Treatment Facility
- City of Vancouver Westside Treatment Facility