The median annual wage for Water and Wastewater Treatment Plant and System Operators in Missouri is $52,990 (May 2024 BLS OES). The mean (average) is $53,900.
Pay spans roughly $37,480 at the 10th percentile to $69,580 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $25.48 per hour. An estimated 2,700 people work as water and wastewater treatment plant and system operators in Missouri.
| Median (annual) | $52,990 |
| Mean (annual) | $53,900 |
| Median (hourly) | $25.48 |
| 10th percentile | $37,480 |
| 90th percentile | $69,580 |
| Employment | 2,700 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.