Water Treatment Plant Operator salary at County Of Frederick

The average water treatment plant operator salary at County Of Frederick was $54,528 , which is 17 percent lower than the average salary for this job in Maryland, and 10 percent lower than the national average for this job . Water Treatment Plant Operator salaries at County Of Frederick typically range from $40,282 to $58,378 (25th to 75th percentile). The highest reported water treatment plant operator salary was $138,084. There are 17 employees at County Of Frederick with the job title water treatment plant operator.