Langley’s Wastewater Treatment Plant is one of Washington’s best at keeping the state’s water sources clean, according to state regulators.

Washington’s Department of Ecology honored Langley’s plant with the Outstanding Wastewater Treatment Plant Award for 2012. In a letter from the agency to Mayor Fred McCarthy, dated Sept. 12, the department commended Langley for “the superior performance of its wastewater treatment plant. The outstanding record of the City of Langley Wastewater Treatment Plant places it among the top municipal wastewater treatment plants in Washington.”

Langley was one of 107 perfectly-performing wastewater treatment plants across Washington. They are considered the primary way to protect lakes, rivers and Puget Sound from contamination. Since 1995, Langley plant has won the award nine times, including five times in the past six years.