Waterworks Maintenance Mechanic / Operator

City of St. Charles, MO; Saint Charles (MO); On-site; USD 43,229 - 49,924; Full time

Benefits offered by this job

Medical, Dental, and Vision Insurance

Life and Disability Insurance

Paid Vacation

Employee Assistance Programs

Job summary

The City of St. Charles, MO is seeking a Waterworks Maintenance Mechanic / Operator to manage the operation and maintenance of water treatment systems. Candidates should be proficient in equipment handling and laboratory analysis.

This full-time position requires a high school diploma or G.E.D. and two years of technical training, with a Missouri driver's license mandatory and water treatment certification preferred.

Qualifications

• Two years of post-secondary training in relevant fields.
• Experience in utility operations or relevant knowledge.
• Valid Missouri driver's license required.

Responsibilities

• Operate and maintain water treatment plant systems and equipment.
• Monitor and collect samples for water quality control.
• Participate in emergency response and callout duties.

Skills

Knowledge of water treatment systems

Mathematical proficiency

Laboratory procedures

Education

High school diploma or G.E.D. with additional technical training

Tools

Hand tools and power tools

Heavy equipment

Job description

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

Responsibilities

• 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.

Physical Requirements

• 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.

Qualifications

• 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 at www.stcharlescitymo.gov.

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