The average salary for a hydrologist in Illinois is around $83,720 per year.
Avg Salary
Hydrologists earn an average yearly salary of $83,720.
Wages typically start from $59,070 and go up to $133,430.
25% above national average Updated in 2025
Hydrologist earnings by seniority
90th percentile
Top-level hydrologist earnings begin at:
$64.15 per hour
$133,430 per year
75th percentile
Senior-level hydrologist earnings begin at:
$52.94 per hour
$110,110 per year
50th percentile
Mid-level hydrologist earnings begin at:
$40.25 per hour
$83,720 per year
25th percentile
Junior-level hydrologist earnings begin at:
$32.49 per hour
$67,590 per year
10th percentile
Starting level hydrologist earnings begin at:
$28.40 per hour
$59,070 per year
Approximate values based on highest and lowest earning segments.
Hydrologist salary by state
| State Name | Average Salary |
|---|---|
| Ohio | $98,200 |
| New Mexico | $97,470 |
| Oklahoma | $97,470 |
| Minnesota | $94,580 |
| Wyoming | $94,520 |
| Utah | $94,190 |
| Connecticut | $94,060 |
| Oregon | $93,690 |
| Pennsylvania | $91,730 |
| New Hampshire | $91,370 |
| New York | $88,100 |
| Arizona | $86,700 |
| Vermont | $86,140 |
| Montana | $84,500 |
| Illinois | $83,720 |
| North Carolina | $81,770 |
| Iowa | $81,150 |
| Texas | $81,080 |
| Tennessee | $80,940 |
| Indiana | $80,700 |
| Idaho | $78,850 |
| Wisconsin | $78,770 |
| Florida | $76,850 |
| Maine | $75,180 |
| South Carolina | $65,770 |
| North Dakota | $64,120 |
| Nebraska | $61,510 |
| Maryland | $143,010 |
| Virginia | $132,080 |
| New Jersey | $126,680 |
| California | $122,110 |
| Georgia | $121,830 |
| Massachusetts | $119,350 |
| Missouri | $116,100 |
| Alaska | $108,660 |
| Nevada | $107,930 |
| Washington | $105,600 |
| Louisiana | $104,520 |
| Michigan | $101,060 |
| Colorado | $100,840 |
How do hydrologist salaries compare to similar careers?
Hydrologists earn about the same as related careers in Illinois. On average, they make less than food science technologists but more than industrial ecologists.
| Career | Median Salary |
|---|---|
| Food science technologist salary | $94K |
| Biochemist salary | $87K |
| Scientist salary | $91K |
| Occupational health specialist salary | $98K |
| Chemist salary | $85K |
| Hydrologist salary | $84K |
| Molecular biologist salary | $83K |
| Bioinformatics scientist salary | $83K |
| Environmental consultant salary | $82K |
| Industrial ecologist salary | $82K |
Source: CareerExplorer (Aggregated)