Water and wastewater treatment plant and system operators perform work familiar to some military personnel.

Jobs in this career are similar to the following job classifications in the

120A
Construction Engineering Technician (Warrant Officer only)
12K
Plumber (Enlisted)
91J
Quartermaster and Chemical Equipment Repairer (Enlisted)
923A
Petroleum Technician (Warrant Officer only)
92W
Water Treatment Specialist (Enlisted)

The following military occupations are no longer in active use:

51N
Water Treatment and Plumbing Systems Specialist (Enlisted)
77W
Water Treatment Specialist (Enlisted)