The median annual wage for Water and Wastewater Treatment Plant and System Operators in Washington is $78,810 (May 2024 BLS OES). The mean (average) is $78,520.
Pay spans roughly $54,990 at the 10th percentile to $101,450 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $37.89 per hour. An estimated 1,950 people work as water and wastewater treatment plant and system operators in Washington.
| Median (annual) | $78,810 |
| Mean (annual) | $78,520 |
| Median (hourly) | $37.89 |
| 10th percentile | $54,990 |
| 90th percentile | $101,450 |
| Employment | 1,950 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.