The median annual wage for Water and Wastewater Treatment Plant and System Operators in Longview-Kelso, WA is $63,410 (May 2024 BLS OES). The mean (average) is $70,880.
Pay spans roughly $62,320 at the 10th percentile to $88,430 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $30.49 per hour. An estimated 30 people work as water and wastewater treatment plant and system operators in Longview-Kelso, WA.
| Median (annual) | $63,410 |
| Mean (annual) | $70,880 |
| Median (hourly) | $30.49 |
| 10th percentile | $62,320 |
| 90th percentile | $88,430 |
| Employment | 30 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.