Instrumentation Technician I/II/III

Herndon, Virginia
May 17, 2023
May 31, 2023
Full Time


Under general supervision of the Instrumentation Supervisor performs skilled corrective and preventive maintenance work associated with the installation, repair and maintenance of supervisory control and data acquisition equipment (SCADA), electronic process control instrumentation and electronic equipment used in the production, treatment, storage, and distribution of water. Assures proper maintenance of equipment and office records.


  • Performs skilled installation, corrective, and preventive maintenance work by: Making frequent inspections of process control instrumentation and electronic equipment. Analyzing and investigating causes of instrument failures and irregular operation, and recommends or implements corrective measure to improve accuracy and reliability. Installing, calibrating and making necessary repairs to process control computers; filter systems; flow and pressure transmitters; chlorine, pH and turbidity monitoring equipment; chemical feed equipment; plant and distribution telemetering equipment; electronic/electrical control circuits; and other complex instrumentation activities utilized in the water treatment process. Assisting in maintaining SCADA (includes Plant computer system and Remote PLC’s) Reporting the more complex problems to the supervisor. Monitoring and calibrating instrumentation systems utilizing test and monitoring equipment. Conducting routine preventive maintenance tasks.

Assures proper maintenance of equipment and office records by: Maintaining assigned Fairfax Water vehicles and tools including shop testing equipment. Maintaining and updating equipment maintenance and service files. Assisting in maintaining spare parts and project material inventory.

  • Assisting the Instrumentation Supervisor in reviewing, modifying and improving existing systems.
  • Performs other duties as assigned or required.


  • Associates Degree in Instrumentation/Electronics or minimum of four years progressively responsible instrumentation and electronic repair experience, or any combination of education and experience. Good knowledge of the theory, methods and practices of electronics. Good knowledge of the tools and equipment used in electronic equipment repair. Good knowledge of the repair of process control instrumentation. Considerable knowledge of safety regulations and accident prevention practices. Good computer hardware and software skills. Ability to locate and correct defects in instrumentation and electronic devices. Ability to read electronic schematics, circuit motor and electric control drawings and manufacturer manuals. Ability to read and understand Ladder Logic/ Block Diagram related to programmable logic controllers. Ability to locate and correct defects in instrumentation and electronic devices. Willingness and ability to work at other Fairfax Water locations as required. Ability to establish and maintain effective working relationships with co-workers, supervisors, and the public. Possession of a valid driver’s license and good driving record. Ability to work scheduled and emergency overtime as required. Ability to work standby. Must pass a controlled substance (drug) test for employment.  This position is also subject to random testing after hire.

Physical Requirements:

  • Ability to climb and work from water tanks. Ability to distinguish colors of electrical wiring

Fairfax Water requires new employees to be fully vaccinated against COVID-19, subject to legally required exceptions.