The median annual wage for Water and Wastewater Treatment Plant and System Operators in Walla Walla, WA is $66,740 (May 2024 BLS OES). The mean (average) is $66,150.
Pay spans roughly $43,050 at the 10th percentile to $78,310 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $32.09 per hour. An estimated 30 people work as water and wastewater treatment plant and system operators in Walla Walla, WA.
| Median (annual) | $66,740 |
| Mean (annual) | $66,150 |
| Median (hourly) | $32.09 |
| 10th percentile | $43,050 |
| 90th percentile | $78,310 |
| Employment | 30 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.