The median annual wage for Hydrologists in Illinois is $79,790 (May 2024 BLS OES). The mean (average) is $91,650.
Pay spans roughly $56,530 at the 10th percentile to $130,830 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $38.36 per hour. An estimated 90 people work as hydrologists in Illinois.
| Median (annual) | $79,790 |
| Mean (annual) | $91,650 |
| Median (hourly) | $38.36 |
| 10th percentile | $56,530 |
| 90th percentile | $130,830 |
| Employment | 90 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.