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Hillsborough County Government

Plant Maintenance Mechanic III (#PLTMM3AFSK) AFSK
$15.22-$24.16 Hourly / $2,638.13-$4,187.73 Monthly / $31,657.60-$50,252.80 Yearly


Performs supervisory duties in the maintenance, fabrication and repair of mechanical equipment. Primary duties include maintenance, repair and overhaul of machinery, pumps and related equipment for water and wastewater treatment plants, pumping stations and wells. Duties are performed under the general supervision of an immediate supervisor who evaluates performance through observation of work, periodic conferences, critiques, and/or records and reports.


Graduation from high school or possession of a GED Certificate; and
Six years of experience as a mechanic working with pumps, internal combustion or electrical motors, which included one year as a supervisor; 

Or an equivalent combination of education, training, and experience that would reasonably be expected to provide the job-related competencies noted below; and

Possession of a valid Driver License.


  • Customer Commitment - Proactively seeks to understand the needs of our customers and provide the highest standards of service.
  • Dedication to Professionalism and Integrity - Demonstrates and promotes fair, honest, professional and ethical behaviors that establishes trust throughout the organization and with the public we serve.
  • Organizational Excellence - Takes ownership for excellence through one's personal effectiveness and dedication to the continuous improvement of our operations.
  • Success through Teamwork - Collaborates and builds partnerships through trust and the open exchange of diverse ideas and perspectives to achieve organizational goals.


  • Considerable knowledge of the construction, assembly, adjustment and maintenance of equipment used in water and wastewater treatment.
  • Considerable knowledge of the materials, tools, and methods used in the repair maintenance, and servicing of a wide variety of gasoline engines, diesel engines, pumps, and motors.
  • Considerable knowledge of the operation and repair of gasoline engines, diesel engines, pumps, motors, gear drives and other equipment used in the treatment of water and wastewater.
  • Knowledge of the parts requirements and the interchangeability of parts between various makes and models of equipment.
  • Ability to diagnose defects in equipment used in the treatment of water and wastewater.
  • Ability to plan, organize, and supervise the work of a group of skilled and semi-skilled assistants.


Note: The following duties are illustrative and not exhaustive. The omission of specific statements of duties does not exclude them from the position if the work is similar, related, or a logical assignment to the position. Depending on assigned area of responsibility, incumbents in the position may perform some or all of the activities described below.
  • Plans and supervises the activities of a group of skilled mechanics.
  • Manages periodic inspections and preventive maintenance programs to insure that equipment is maintained in proper working order.
  • Gives technical advice and assistance to subordinates.
  • Maintains a variety of records relating to work orders, time reports, inventory, purchase orders and repair parts.
  • Inspects equipment for adherence to safety standards and maintenance requirements.
  • Manages the operation of a small repair shop.
  • May be on call for standby and/or emergencies.
  • May supervise Plant Maintenance Mechanic and Plant Maintenance Mechanic II.
  • Performs other related duties as required.

CLASS: PLTMM3AFSK; EST: 10/1/1974; REV: 11/3/2011;