Median annual earnings of water and wastewater treatment plant and system operators were $34,960 in May 2004. The middle 50 percent earned between $27,180 and $43,720. The lowest 10 percent earned less than $21,700, and the highest 10 percent earned more than $53,540. Median annual earnings of water and liquid waste treatment plant and systems operators in May 2004 were $34,990 in local government and $32,350 in water, sewage, and other systems.
In addition to their annual salaries, water and wastewater treatment plant and system operators usually receive benefits that may include health and life insurance, a retirement plan, and educational reimbursement for job-related courses.