What does a Environmental Engineers salary really buy you in Illinois?
Illinois is near the US average cost of livingData: BLS OEWS 2024 + BEA Regional Price Parities 2022 • Updated 2026-03-31
Illinois's Regional Price Parity (RPP) is 101.3, meaning prices are 1.3% higher the national average. A Environmental Engineers earning $107,550 in Illinois has the equivalent purchasing power of $106,169 in an average-cost US state.
Every dollar goes further in low-cost states. Here is how each salary percentile compares after adjusting for Illinois's cost of living.
| Percentile | Nominal Salary | COL-Adjusted | Difference |
|---|---|---|---|
| 10th Percentile (P10) | $69,590 | $68,696 | $-893 |
| 25th Percentile (P25) | $84,610 | $83,524 | $-1,085 |
| Median (P50) | $107,550 | $106,169 | $-1,380 |
| 75th Percentile (P75) | $126,190 | $124,570 | $-1,619 |
| 90th Percentile (P90) | $150,070 | $148,144 | $-1,925 |
Illinois's cost of living is close to the national average, so $107,550 keeps most of its value at $106,169 in real terms. Location choice here is more about career opportunities than cost arbitrage.
Where does Environmental Engineers salary stretch the furthest? Top 10 states ranked by COL-adjusted median salary.
Illinois ranks #19 out of 50 states for Environmental Engineers after cost-of-living adjustment.
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A Environmental Engineers in Illinois earns a median salary of $107,550 per year. After adjusting for Illinois's cost of living (RPP=101.3), the real purchasing power is $106,169 — a -1.3% difference.
Illinois's cost of living is 1.3% higher than the national average according to the BEA Regional Price Parities (2022). The RPP index for Illinois is 101.3 (US average = 100).
Regional Price Parities (RPPs) are price indexes published by the U.S. Bureau of Economic Analysis (BEA) that measure differences in price levels across states. They are expressed as a percentage of the national average (US = 100). Higher RPP means higher cost of living.
The adjusted salary is calculated as: Nominal Salary x (100 / RPP). For a Environmental Engineers in Illinois: $107,550 x (100 / 101.3) = $106,169. This represents what the salary would be worth in a state with average living costs.