Waterworks Maintenance Mechanic​/Operator

Waterworks Maintenance Mechanic / Operator

Department: Public Works Department
Posting Date: June 30, 2026
Closing: Open Until Filled

Salary – C Certification: $31.38/hr
Salary – B Certification: $32.95/hr
Salary – A Certification: $36.24/hr

Benefits: Medical, Dental, Voluntary Vision, Life and Disability Insurance; FSA; HSA;
Lagers Pension – L6 Tier and Deferred Compensation program;
Paid Vacation;
Paid Holidays;
Employee Assistance Programs and Educational Benefits.

Status: Full time
Exempt/Non-exempt: Non-exempt

• Operate and maintain all water treatment plant systems, pump stations, generators, gauges, pumps, filters, controls, and equipment.
• Collect bacteriological and other samples as required by MDNR.
• Monitor the performance of and operate and maintain all equipment, electrical systems, gauges, and charts in the treatment plant, pump stations, generators, pumps, filters, and other control systems; record data concerning plant operations.
• Chart lab test results for trend analysis, maintain accurate records of analysis and test results, evaluate data, and write reports as required.
• Collect samples and identify concentrations of chemical characteristics of water required in accordance with local, State and Federal requirements; gather and test water samples for reports as required.
• Perform quality control tests on lab equipment and lab analysis; chart test results for trend analysis; evaluate procedures to assure accuracy of test results.
• Calibrate and modify instrumentation and control equipment including recorders and other water quality monitoring equipment.
• Participate in a rotating schedule: 6:30 AM–6:30 PM, 6:30 PM–6:30 AM, and 4‑hour Friday shift; complete required overtime as necessary.
• Mathematically proficient: addition, subtraction, multiplication, division, geometry, trigonometry, percentages, fractions, decimals, volumes, ratios.
• Receive after‑hour emergency phone calls while on duty and notify appropriate Public Works supervisors, on‑call personnel, and Public Works Management.

• Frequently lift, carry, push, and pull materials, tools, and equipment weighing up to 50 lbs and occasionally up to 100 lbs with assistance or appropriate equipment.
• Perform strenuous manual labor for extended periods.
• Walk, stand, bend, stoop, kneel, crouch, crawl, climb, and reach while performing maintenance and repair activities.
• Enter and work within trenches, excavations, vaults, pits, and other confined spaces in accordance with safety regulations.
• Climb ladders, stairs, embankments, and uneven terrain.
• Operate hand tools, power tools, valves, hydrants, pumps, and heavy equipment requiring manual dexterity and hand‑eye coordination.
• Work in awkward positions and confined areas for extended periods.
• Distinguish colors, gauges, warning lights, and utility markings necessary for safe operation and maintenance activities.
• Hear verbal instructions, alarms, and warning signals in noisy environments.
• Maintain balance and coordination while working on wet, slippery, uneven, or elevated surfaces.
• Perform emergency repairs during adverse weather conditions, including extreme heat, cold, rain, snow, and ice.
• Work outdoors for prolonged periods and be exposed to dust, dirt, noise, chemicals, fumes, and other environmental conditions associated with water distribution system maintenance.
• Operate motor vehicles and equipment safely and effectively.
• Wear and utilize required personal protective equipment (PPE), including respiratory protection when necessary.
• Respond to emergency callouts and work extended hours, including nights, weekends, holidays, and overtime as required.

• High school diploma or G.E.D. supplemented by two (2) years post‑secondary college or technical training in biology, environmental science, chemistry, or a closely related field and two (2) years’ experience in a utility, or any combination of education and experience that provides equivalent knowledge, skills, and abilities.
• Working knowledge of equipment, facilities, materials, maintenance and operation activities, including laboratory procedures.
• Valid Missouri driver’s license required.
• Department of Natural Resources Class C (B or A) Water Treatment Plant Operator Certification preferred. Minimum requirement of Class D Certification within 6 months with ability to obtain Class C or higher certification within 18 months of hire.

Applicants can apply online harlescitymo.gov.

The City of Saint Charles is an Equal Opportunity Employer and participates in E‑Verify.