Maintenance Mechanic

City of O’Fallon; O’Fallon (MO); On-site; USD 38,000 - 39,000; Full time

Benefits offered by this job

Medical, Dental, Vision

Paid leave

Pension plan

Tuition reimbursement

Wellness incentives

Job summary

The City of O’Fallon, Missouri, is seeking a skilled Maintenance Mechanic for the Water & Sewer Department. The role supports 24/7 operations, maintaining hydraulic, mechanical, electrical, and SCADA systems across treatment plants and pump stations.

Qualified candidates will have a high school diploma or GED, 1–2 years of related experience or apprenticeship, and the ability to obtain Missouri CDL Class A with tanker endorsement, along with DNR certifications. Equal opportunity employer.

Qualifications

• High school diploma or GED required.
• Ability to work on-call evenings/weekends and in all weather conditions.
• One to two years of relevant experience or equivalent apprenticeship/internship.
• Ability to obtain a Missouri Class A CDL with tanker endorsement.
• Ability to obtain required Missouri DNR certifications in Drinking Water Treatment, Water Distribution, Wastewater Treatment, and MWEA Collection Systems.
• Employees must pursue the highest level of eligible DNR certifications.

Responsibilities

• Maintain, repair, overhaul, install, and inspect hydraulic, mechanical, electrical, and SCADA systems.
• Perform preventative and predictive maintenance on water and sewer facilities.
• Diagnose equipment deficiencies and perform advanced electrical/electromechanical troubleshooting (220V/480V).
• Analyze faults and maintain motor control panels and electrical control equipment.
• Operate hand and machine tools to precise tolerances.
• Utilize test equipment such as megohmmeters and volt-ohm meters.
• Maintain and install controls; service sensors, transducers, PLCs, and VFDs.
• Perform welding, cutting, and process piping repairs.
• Assist with grounds and building maintenance and equipment operation (skid steers, cranes, etc.).
• Support asset management and respond to emergency situations.

Skills

Mechanical maintenance

Pneumatic systems

Electrical systems

SCADA

Wiring diagrams

Safety practices

Communication skills

Education

High school diploma or GED

Tools

Hand tools

Power tools

Computers/mobile devices

Megohmmeters/VP meters

Test equipment

Job description

City of O'Fallon, Missouri
Maintenance Mechanic – Water & Sewer Department
Hourly Rate: $27.28–$28.00 DOQ

The City of O'Fallon is seeking a skilled and dedicated Maintenance Mechanic to support operations within our Water and Sewer Department. This essential role performs advanced technical work to maintain, repair, and overhaul hydraulic, mechanical, electrical, and SCADA systems across the City's Water Treatment Plant, Wastewater Treatment Plant, Water Wells, and Sewer Pump Stations.

This position supports 24/7 operations and plays a vital role in ensuring safe, reliable, and regulatory-compliant utility services for our community.

Major Duties

• Maintain, repair, overhaul, install, and inspect hydraulic, mechanical, electrical, and SCADA systems.
• Perform preventative and predictive maintenance on water and sewer facilities.
• Diagnose equipment deficiencies and perform advanced electrical/electromechanical troubleshooting, including work on 220V and 480V systems.
• Analyze faults and maintain motor control panels and electrical control equipment.
• Operate hand and machine tools to precise tolerances.
• Utilize specialized test equipment such as megohmmeters, volt-ohm meters, pneumatic and electronic control devices.
• Maintain and install pneumatic, hydraulic, electronic, and computer-based controls; lubricate and inspect equipment.
• Service instrumentation sensors, transducers, PLCs, control wiring, and VFDs.
• Perform welding, cutting, and process piping repairs.
• Assist with grounds and building maintenance, SCADA monitoring, and equipment operation including skid steers, loaders, cranes, vacuum/jet trucks, and backhoes.
• Address customer concerns, assist with purchasing, maintain facilities, perform data entry and daily readings.
• Provide functional supervision when needed and assist other City crews.
• Support asset management activities and respond to emergency situations.
• Assist with snow removal and perform related duties as assigned.

Knowledge & Skills Required

• Strong knowledge of mechanical equipment maintenance and pumping systems.
• Experience with pneumatic, electrical, hydraulic, and electronic control systems, including calibration and analysis.
• Familiarity with SCADA repair and interpretation of wiring diagrams/blueprints.
• Knowledge of safety practices related to 220V and 480V electrical equipment.
• Understanding of water and wastewater system maintenance.
• Skill in using specialized equipment, hand tools, power tools, computers, and mobile devices.
• Effective oral and written communication skills.

Minimum Qualifications

• High school diploma or GED required.
• Ability to work on-call evenings/weekends and in all weather conditions.
• One to two years of relevant experience or equivalent apprenticeship/internship.
• Ability to obtain a Missouri Class A CDL with tanker endorsement.
• Ability to obtain required Missouri DNR certifications in Drinking Water Treatment, Water Distribution, Wastewater Treatment, and MWEA Collection Systems.
• Employees must pursue the highest level of eligible DNR certifications.

Benefits

The City of O'Fallon values employee well-being and offers a comprehensive benefits package, including:

• Medical, Dental, Vision, employer-paid Accident and Life Insurance
• Optional HSA with employer contribution and FSAs
• Optional Pet Insurance
• Wellness incentives and onsite fitness facilities
• Discounted membership at Renaud Fitness & Aquatic Center
• Employee Assistance Program and Identity Theft Protection
• Paid leave: 3 weeks vacation for new hires, 11 holidays, 1 personal holiday, sick leave, and extended illness leave
• Missouri LAGERS L-6 Pension Plan and 457(b) retirement plans
• Tuition reimbursement
• Designated Zen and lactation rooms at select facilities

The City of O'Fallon is an Equal Opportunity Employer and participates in E-Verify.