The average salary for a water treatment plant operator in Missouri is around $49,940 per year.
Avg Salary
Water treatment plant operators earn an average yearly salary of $49,940.
Wages typically start from $38,600 and go up to $64,930.
20% below national average Updated in 2025
Water treatment plant operator earnings by seniority
Top-level water treatment plant operator earnings begin at:
$31.22 per hour
$64,930 per year
Senior-level water treatment plant operator earnings begin at:
$28.08 per hour
$58,400 per year
Mid-level water treatment plant operator earnings begin at:
$24.01 per hour
$49,940 per year
Junior-level water treatment plant operator earnings begin at:
$21.86 per hour
$45,460 per year
Starting level water treatment plant operator earnings begin at:
$18.56 per hour
$38,600 per year
Approximate values based on highest and lowest earning segments.
Water treatment plant operator salary by state
| State Name | Average Salary |
|---|---|
| California | $81,770 |
| Nevada | $81,440 |
| Washington | $80,800 |
| District of Columbia | $78,890 |
| Connecticut | $78,820 |
| New Jersey | $78,760 |
| Minnesota | $74,670 |
| Colorado | $74,200 |
| Oregon | $69,720 |
| Massachusetts | $68,550 |
| Illinois | $67,810 |
| Hawaii | $65,560 |
| Delaware | $64,940 |
| New York | $63,990 |
| Vermont | $63,640 |
| Wisconsin | $63,550 |
| Pennsylvania | $63,310 |
| Wyoming | $63,260 |
| New Hampshire | $62,940 |
| Maryland | $61,870 |
| Maine | $61,870 |
| Rhode Island | $61,820 |
| Arizona | $61,340 |
| Utah | $61,290 |
| Nebraska | $61,220 |
| Iowa | $60,990 |
| North Dakota | $60,470 |
| Alaska | $60,160 |
| Virginia | $59,420 |
| Michigan | $59,270 |
| Ohio | $59,170 |
| Florida | $59,030 |
| Montana | $58,040 |
| Indiana | $53,540 |
| South Dakota | $53,370 |
| Idaho | $52,210 |
| South Carolina | $52,090 |
| Alabama | $51,870 |
| North Carolina | $51,680 |
| Tennessee | $50,670 |
| Missouri | $49,940 |
| Texas | $49,460 |
| Georgia | $48,930 |
| New Mexico | $48,190 |
| Guam | $47,610 |
| West Virginia | $47,560 |
| Kansas | $46,780 |
| Mississippi | $46,480 |
| Louisiana | $46,210 |
| Oklahoma | $45,890 |
| Kentucky | $45,430 |
| Arkansas | $44,320 |
| Puerto Rico | $27,910 |
How do water treatment plant operator salaries compare to similar careers?
Water treatment plant operators earn about the same as related careers in Missouri. On average, they make less than locksmiths but more than machine assemblers.
| Career | Median Salary |
|---|---|
| Locksmith salary | $50K |
| Welder salary | $52K |
| Glazier salary | $51K |
| Hazardous materials removal worker salary | $59K |
| Hydroelectric plant technician salary | $52K |
| Water treatment plant operator salary | $50K |
| Metal caster salary | $49K |
| Maintenance worker salary | $48K |
| Mining machine operator salary | $47K |
| Machine assembler salary | $47K |
Source: CareerExplorer (Aggregated)