Water Treatment Plant Operating federal salary series 5409
Full-time federal employees in the Water Treatment Plant Operating series earned a median of $83,730 in
annualized adjusted basic pay in September 2026, 24% below the all-federal median of $109,641.
The middle half earned between $71,406 and $108,107.
Median pay
$83,730
full-time, September 2026
Middle 50%
$71,406–$108,107
25th–75th percentile
Employees
260
in this series, all schedules
Change in median
+7.1%
vs. September 2025
Pay distribution, full-time employees with published pay, September 2026
Federal pay depends mostly on grade and step, plus a locality adjustment for where the job is located; see the GS pay scale explainer.
OPM withheld pay for 80% of employees in this series. The figures here describe only employees with published pay; withholding is concentrated in certain agencies (see data coverage).
Change since September 2025
The median moved +7.1% from $78,210 in September 2025 to $83,730 in September 2026. Headcount went from 295 to 260 (−11.9%). A change in the median reflects both pay adjustments and who joined or left the workforce, so it is not the same as a pay raise.
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