Wastewater Maintenance Supervisor salary at King County

The average wastewater maintenance supervisor salary at King County was $154,917 , which is 6 percent higher than the average salary for this job in Washington, and 23 percent higher than the national average for this job . Wastewater Maintenance Supervisor salaries at King County typically range from $151,930 to $162,745 (25th to 75th percentile). The highest reported wastewater maintenance supervisor salary was $167,237. There are 7 employees at King County with the job title wastewater maintenance supervisor.