Water & Sewer Maintenance Mechanic – On-Call, 24/7

City of O'Fallon; O’Fallon (MO); On-site; USD 37,000 - 39,000; Full time

Benefits offered by this job

Medical Insurance

Dental Insurance

Vision Insurance

Retirement Plan

Job summary

City of O'Fallon 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 water treatment, wastewater treatment, wells, and pump stations.

Candidates should have 1–2 years of relevant experience, CDL tanker endorsement, and Missouri DNR certifications. The city offers comprehensive benefits and opportunities for advancement.

Qualifications

• High school diploma or GED required.
• Ability to work on-call evenings/weekends and in all weather conditions.
• 1–2 years of relevant experience or equivalent apprenticeship/internship.
• Ability to obtain a Missouri Class A CDL with tanker endorsement.
• Ability to obtain 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, including 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.

Skills

Mechanical maintenance

Pneumatic systems

Electrical systems

SCADA

Troubleshooting

Safety practices

Communication skills

Education

High school diploma or GED

Tools

Megohmmeters

VOM/ multimeter

Power tools

Welding equipment

Job description

City of O'Fallon 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 water treatment, wastewater treatment, wells, and pump stations.

Candidates should have 1–2 years of relevant experience, CDL tanker endorsement, and Missouri DNR certifications. The city offers comprehensive benefits and opportunities for advancement.