The average annual and hourly salaries for water and wastewater treatment plant and system operators in the state of Illinois are shown in Table 1 and Table 2, respectively. The comparison of the salary statistics of water and wastewater treatment plant and system operators among Illinois areas is shown in Table 3. The salary statistics are based on the national compensation survey conducted by the U.S. Bureau of Labor Statistics in 2017 and published in April 2018 [1].
| Percentile Bracket | Average Annual Salary |
|---|---|
| 10th Percentile Wage | $27,840 |
| 25th Percentile Wage | $41,990 |
| 50th Percentile Wage | $54,950 |
| 75th Percentile Wage | $66,000 |
| 90th Percentile Wage | $79,900 |
Table 1 shows the average annual salary for water and wastewater treatment plant and system operators in Illinois in 5 percentile scales. The average annual salary for the 90th percentile (the top 10 percent of the highest paid) is $79,900. The median (50th percentile) annual salary is $54,950. The average annual salary for the bottom 10 percent is $27,840.
The table and chart below show the trend of the median salary of water and wastewater treatment plant and system operators from 2012 to 2017.
| Year | Median Salary | Yearly Growth | 5-Year Growth |
|---|---|---|---|
| 2017 | $54,950 | 2.00% | 9.86% |
| 2016 | $53,850 | 4.49% | - |
| 2015 | $51,430 | 0.31% | - |
| 2014 | $51,270 | 1.99% | - |
| 2013 | $50,250 | 1.43% | - |
| 2012 | $49,530 | - | - |
Table 3 shows the median annual salary of water and wastewater treatment plant and system operators in some Illinois cities and metropolitan areas. We note that the median annual salary of water and wastewater treatment plant and system operators in state of Illinois ranges from $36,180 to $66,280. The highest paying area for water and wastewater treatment plant and system operators in Illinois is Chicago-Joliet-Naperville (IL Metropolitan Division) with a median annual salary of $66,280. The second highest paying city/area in Illinois State is Chicago-Joliet-Naperville (IL-IN-WI Area) (mean annual salary $62,540). The lowest paying area is West Central Illinois nonmetropolitan area with a median annual salary of $36,180.
