The median annual wage for Water and Wastewater Treatment Plant and System Operators in Seattle-Tacoma-Bellevue, WA is $88,440 (May 2024 BLS OES). The mean (average) is $86,870.
Pay spans roughly $61,470 at the 10th percentile to $105,100 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $42.52 per hour. An estimated 730 people work as water and wastewater treatment plant and system operators in Seattle-Tacoma-Bellevue, WA.
| Median (annual) | $88,440 |
| Mean (annual) | $86,870 |
| Median (hourly) | $42.52 |
| 10th percentile | $61,470 |
| 90th percentile | $105,100 |
| Employment | 730 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.