The Metropolitan Water District of Southern California

Job Details

Job Summary

Operations & Maintenance Technician IV- Mechanical

The Water System Operations Group, Water Treatment Section, currently has one (1) opening for an Operations & Maintenance Technician IV - Mechanical at the Diemer Water Treatment Plant in Yorba Linda, CA. 

Utilizes journey level mechanical skills, experience and knowledge to maintain, repair or install large complex water utility equipment and systems. Will perform preventive maintenance, corrective troubleshooting and process improvements on pumps, valves, valve actuators, geared driven equipment, screw conveyors, chemical feed systems (to include liquid chlorine, ozone, alum, polymer, caustic soda, liquid ammonia, fluorosilicic acid, sulfuric acid and peroxide), compressors, hydraulic and pneumatic systems, mixers, agitators, piping, fittings in order to sustain or improve plant capacity or operational reliability.

Utilizes specialty tools and equipment to perform precision shaft alignment, predictive diagnostic vibration testing and lube oil sampling that assists in determining the severity of equipment wear providing input to mitigate potential failures and gives recommendations for the appropriate follow-up action in order to reduce equipment downtime.

Performs maintenance welding, fabrication and machining, operates heavy equipment such as dump trucks, loaders, backhoes, overhead hoists and mobile cranes while performing safe rigging procedures adhering to proper use of Personal Protective Equipment and respiratory protection.

Utilizes computer programs for individual time entry, maintenance work order tracking, work planning and estimating and general professional communications.

1. Performs a wide variety of journey mechanical preventive (PM) and corrective (CM) maintenance on water treatment related systems, processes and facilities. PM and CM activities includes work on oxygen generation and ozone equipment, valves, pneumatic and hydraulic control systems, pumps, generators, lubrication and cooling equipment, chemical feed systems and associated equipment.

2. Completes PM and CM activities on large-scale water treatment assets, systems and processes including flocculators, filter beds, flash mixers, conveyor systems, sedimentation basins, storage tanks, slide gates, pipes, valves and varied drive and control systems to maintain plant integrity, capacity and operational reliability.

3. Utilizes state-of-the art technology, perform or assist with predictive and preventative maintenance activities to determine equipment wear, including predictive analysis through laser alignment, vibration and oil analysis to anticipate maintenance needs and determine appropriate actions to maintain and enhance equipment uptime.

4. Performs and/or assists with preventive and corrective maintenance on mechanical/electrical systems necessary for standby power generators and associated systems to maintain operational readiness during outages or other emergencies.

5. Performs preventive and corrective maintenance on Chemical Unloading Facility equipment, processes and systems to include piping, valves, structures, standpipes, metering and monitoring equipment, alarms and test equipment. Operate and monitor valves, gauges and other chemical transfer and mixing systems to ensure safe and effective transfer and distribution of chemicals and movement of rolling stock or other lading equipment.

6. Repairs and rebuilds treatment equipment, systems and processes as necessary requiring appropriate planning, fabrication of parts, welding and/or assembly and installation to bring equipment/processes to designed operating condition.

7. Performs and/or assists with improving mechanical systems associated with construction and improvement projects such as building and plant enhancements directly associated to water treatment systems including modifications, rebuilding and relocating plant assets and equipment.

8. Completes, at times in collaboration with Specialist level or Control Technicians, complex predictive, preventive, and corrective maintenance on mechanical/electrical systems associated with large motors, pumps, generators, turbines, valves, varied treatment process equipment, and other mechanical related systems associated with treatment plants.

9. Utilizes instrumentation to test and monitor the capabilities, limits, and effectiveness of equipment and subsystems of equipment, as well as other mechanical processes and systems directly related to power and water systems, to measure the ongoing effectiveness of those systems and to assure the quality of maintenance and/or improvements.

10. Inspects, tests, calibrates, and records readings for a variety of mechanical/electrical systems and equipment to meet reliable equipment life and service expectations, including motors, compressors, valves, pumps, flow meters, cranes and lifts, chemical storage and feed systems, basins, tanks, valves and related equipment to ensure effective water output of treatment plants.

11. Assists with planning and coordinating scheduled predictive, preventive and corrective maintenance, as well as unplanned outages, shutdowns, and other emergency situations, to minimize equipment downtime and interruption of service to member agencies or other customers.

Work Schedule: 4/10


High school diploma or GED in addition to a minimum of 6 years in a mechanical maintenance position in a pump plant, treatment plant, hydroelectric or conveyance and distribution facility or similar environment.


High school diploma or GED in addition to the attainment of journey-level skills through a recognized mechanical trade training program. Journey level experience as demonstrated by practical application of general and advanced techniques and practices specific to the operation, maintenance, and repair of mechanical systems in treatment or pump plants, conveyance and distribution, and/or power generation systems, and related apparatus.

Required Knowledge of: Theories and practices of mechanical systems and their application to large-scale mechanical/electrical systems and equipment related to hydroelectric power plants, water treatment and distribution system, as well as general and utility facility mechanical systems, applying methods, practices, and machine shop equipment for metal fabrication, and tools to ensure reliable operations for the movement and treatment of water, generation of power, and optimization of assets and equipment to meet operational demands within established limits and standards, contemporary maintenance reliability analysis and troubleshooting methods including determination of failure causes, diagnostic analysis through failure mode, and root cause analysis, using traditional analog and precision digital instruments to ensure critical measurements and alignments as part of diagnostic and predictive maintenance, including laser alignment equipment, analog and digital meters, calipers and other tools related to close tolerance analysis and work, and safety practices and regulations for operating or working near electrical and/or mechanical equipment, high voltage systems, hazardous materials, and associated tools and equipment.

Required Skills and Abilities to: Understand and interpret mechanical and electrical engineering data necessary to effectively implement predictive, preventive, corrective, and improvement activities; Frequently perform or assist in the drafting, design, layout and development of procedures, manuals, orders and similar documentation to ensure safe operating techniques and/or for training; Interpret complex schematics, blueprints, electrical diagrams, instructions, manuals, operating and maintenance procedures, and specifications related to water treatment, conveyance and distribution and pump plant, as well as building, facility and hydroelectric power systems/equipment; Utilize tools and diagnostic equipment to test and monitor equipment and asset condition, as well as repair, install and replace equipment necessary to meet water and electrical generation demand and/or capacity; Use and maintain mechanical/electrical tools and equipment traditionally used in hydroelectric plants, pump plants, treatment plants, and within water and power control and distribution infrastructure and facilities; Apply and guide others in adhering to safety practices and regulations for operating or working near electrical and/or mechanical equipment, high voltage systems, hazardous materials, and associated tools and equipment.


Employees in this position may be required to obtain and maintain the following certifications, licensing and registrations: 

. Valid Driver's license from state of residency equivalent to a California Class C (Must have at time of application).
. Forklift Certification (Must be obtained within 12 months of hire)
. Chemical Responder Certification (Must be obtained within 12 months of hire)
. Manlift Certification (Must be obtained within 12 months of hire)
. Crane Certifications (Must be obtained within 12 months of hire)


Employees in this position may be required to work off-shift hours and/or stand-by service to address operational needs and emergencies as required. May be required to work extended periods away from the normal reporting location.

Heavy tasks may require lifting and carrying items weighing up to 50 pounds, with intermittent need to lift and carry materials and/or equipment weighing up to 100 pounds with assistance. At times, may be required to use Self Contained Breathing Apparatus (SCBA) or other respiratory filtration and personal protection devices.

Work is performed under all types of conditions including extreme temperatures, open and confined spaces ranging from crawl space to sub-structures as well as varied types of terrains. Job tasks, frequently require working from heights and functioning from lifts, hoists, scaffolds and cranes over surfaces ranging from earthen materials to concrete, steel and water. Work frequently is conducted in close proximity to high volume/pressurized water, as well as exposed, electrically energized equipment including high voltage systems.

Job Related Selection Criteria:
5% Job Preparation (education, experience and training relevant
to the position)
50% Technical knowledge of and skill in:
Preventive maintenance and/or predictive diagnostic testing.
Corrective maintenance, troubleshooting, and repair of industrial equipment and systems.
Operational and maintenance practices of water treatment equipment and
Safety practices related to the industry
15% Interpersonal/Teamwork skills
15% Adaptability/Flexibility
10% Decision Making Skills
5% Oral communication skills
100% Total


Competitive compensation
Excellent Medical, Dental, Life, Vision
Retirement plans including Pension plan and 401k (with matching employer contribution)
Training and advancement opportunities
Excellent working environment
Public transportation reimbursements and van pools
Tuition reimbursement, paid holidays, and more. 
This job announcement has been designed to indicate the general nature and level of work being performed by employees in this classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties, responsibilities and qualifications required of employees assigned to this job. To receive a copy of the complete job description, please send an email to

Reasonable accommodations for people with disabilities may be requested by calling (213) 217-7738 at least five (5) working days in advance of the scheduled examination date(s).

MWD is a Federal and State EO employer Veterans/Disabled and other protected categories.

Who We Are About Your Water In The Community Doing Business With Us Careers Newsroom