Water Treatment Process Engineer Salary in Seattle, WA.
Updated on: Aug 12, 2026
How much does a Water Treatment Process Engineer make in Seattle, WA?
The average Water Treatment Process Engineer in Seattle, WA makes $202,350,
51% above the national average Water Treatment Process Engineer salary of $133,784.
This pay is 21% greater than the combined average salaries of other metroes San Jose, CA, Kansas City, MO, and Portland, OR.
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Water Treatment Process Engineer Salary Average
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*Data is estimated and depends on the generous anonymous contributions of individuals