Wastewater Treatment Supervisor salary at King County

The average wastewater treatment supervisor salary at King County was $157,821 , which is 14 percent higher than the average salary for this job in Washington, and 45 percent higher than the national average for this job . Wastewater Treatment Supervisor salaries at King County typically range from $152,744 to $160,570 (25th to 75th percentile). The highest reported wastewater treatment supervisor salary was $167,306. There are 5 employees at King County with the job title wastewater treatment supervisor.