The median annual wage for Water and Wastewater Treatment Plant and System Operators in Kahului-Wailuku, HI is $63,940 (May 2024 BLS OES). The mean (average) is $61,970.
Pay spans roughly $36,740 at the 10th percentile to $79,560 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $30.74 per hour. An estimated 140 people work as water and wastewater treatment plant and system operators in Kahului-Wailuku, HI.
| Median (annual) | $63,940 |
| Mean (annual) | $61,970 |
| Median (hourly) | $30.74 |
| 10th percentile | $36,740 |
| 90th percentile | $79,560 |
| Employment | 140 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.