The median annual wage for Water and Wastewater Treatment Plant and System Operators in St. Louis, MO-IL is $58,910 (May 2024 BLS OES). The mean (average) is $62,440.
Pay spans roughly $44,180 at the 10th percentile to $83,540 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $28.32 per hour. An estimated 1,140 people work as water and wastewater treatment plant and system operators in St. Louis, MO-IL.
| Median (annual) | $58,910 |
| Mean (annual) | $62,440 |
| Median (hourly) | $28.32 |
| 10th percentile | $44,180 |
| 90th percentile | $83,540 |
| Employment | 1,140 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.