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Instrumentation Technician I/II/III

Fairfax Water
Herndon, Virginia
Closing date
May 31, 2023

Job Details


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.



Fairfax County Water Authority (Fairfax Water) is Virginia's largest water utility, serving one out of every five Virginians who obtain their water from public utilities. Nearly 1.5 million people in the Northern Virginia communities of Fairfax, Loudoun, Prince William and Alexandria depend on Fairfax Water for superior drinking water.

That's 1.5 million friends, neighbors and family members. We don't need any other reason to demand the highest in water quality standards!
Chartered in 1957 by the Virginia State Corporation Commission as a public, non-profit water utility, Fairfax Water operates four water treatment plants with a combined capacity of 262 million gallons per day. The plants include the Corbalis Treatment Plant, operating on the dependable and free-flowing Potomac River in the northwestern area of Fairfax County, and the Griffith Treatment Plant on the impounded Occoquan River in the southeastern area. Water is distributed throughout Fairfax Water's service area through nearly 3,200 miles of water mains.

Fairfax Water produces, on average, 148 million gallons of water per day. More than 235,000 mostly residential accounts in Fairfax County comprise about 60 percent of total water sales. Approximately 40 percent of total water sales are wholesaled to Loudoun and Prince William Counties, the City of Alexandria, the Town of Herndon, Ft. Belvoir and Dulles Airport. Revenues in 2005 were $120 million.

Fairfax Water is governed by a ten-member Board of Directors composed of Fairfax County citizens who are appointed by the elected Board of Supervisors of Fairfax County. A General Manager, supported by a senior staff of engineering and business professionals, manages the day-to-day operations of Fairfax Water.
Summary of Benefits
Regular Full-time Employees

? Vacation Days Per Year Service Years
13 0 < 3 years
19 3 < 15 years
26 15+ years

? Sick Leave
13 days per year for you and/or your household dependent's illness and care.

? Holidays
JAN New Year's Day, Inauguration Day & Martin Luther King Day
FEB Presidents' Day
MAY Memorial Day
JULY Independence Day
SEPT Labor Day
OCT Columbus Day
NOV Veterans' Day, Thanksgiving Day & Day After Thanksgiving
DEC Christmas Eve (1/2 Day) & Christmas Day
** Plus one Discretionary Holiday to be taken during the calendar year.

? Health which also includes Medical / Dental / Vision / Rx
? Life
? Long-Term Disability (effective after 36 months of employment)
? Voluntary Long-Term Care (at employees' cost)


? Fairfax Water Retirement Plan
? 457 Plan (similar to a 401(k) plan)


? Tuition Reimbursement
? Professional Development
? Child/Adult Care Reimbursement Plan
? Flexible Spending Accounts
? Holiday Parties and Picnics
? Credit Union Membership
? Direct Deposit

Fairfax Water is committed to providing comprehensive benefits to our employees and their eligible dependents, as well as opportunities for continued education and professional development.

Employee-paid premiums and contributions are deducted on a pre-tax basis.

This review is intended to be a brief summary of the major benefits provided by Fairfax Water. In all instances, plan documents and policies govern the eligibility and administration of each benefit plan.

Company info
8570 Executive Park Avenue

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