Applying To: Water Treatment Plant Operator

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  • Minimum: $49,868.00
  • Maximum: $60,866.00

City residency requirement may be waived for this position.

Normal entry salary is $49,868. Candidates who possess a Class A, B or C Public Drinking Water Treatment System Operator Certification issued by the Missouri Department of Natural Resources will start at $60,866 annually.  Candidates who possess a Stationary Engineer’s License issued by the City of St. Louis will start at $60,866 annually.


Nature of Work

Incumbents in this position operate and maintain a coagulant house and filter plant in order to purify drinking water and ensure the safety of the drinking water system. Positions require shift, weekend and holiday assignments. Candidates must provide their availability for shift and weekend assignments on the Availability Section of the Employment Application.

For an additional description of this position, please refer to the classification specification for Water Treatment Plant Operator

Minimum Qualifications

An Associate's degree in Engineering, Environmental or Industrial Technologies, Building Maintenance or a related field; or at least one year experience assisting in the operation of a water treatment facility. OR an equivalent combination of training and experience.

Certification: Must obtain a Missouri Public Drinking Water Treatment System Operator Certification (Class D) by completion of the working test period.

License: Must possess and maintain a valid Missouri driver’s license while employed by the City of St. Louis. Must possess a valid driver’s license at the time of filing application and be able to present it upon request. Please note type of license, number, class and expiration date on the Employment Application.

A limited number of applicants may be scheduled for the Oral Interview based on an evaluation of their qualifying education, training and experience as listed on the Employment Application.  Resumes will not be accepted as a substitute to a fully completed application.  When completing the Employment History section of the application, include reasons for changes in employers and explain any gaps in employment.  Incomplete and/or carelessly completed applications will not be considered.

MEDICAL:  An oral swab "Drug Screen" will be administered as part of the Medical examination.

VETERAN'S PREFERENCE POINTS: To be eligible for veteran's preference points, the applicant must submit a copy of his/her DD 214 Certificate of Release or Discharge from Active Duty with the Employment Application. The Director of Personnel may, in his discretion, accept alternate documentation.

LAST DATE FOR FILING APPLICATION:  Applications will be accepted until a sufficient number are received to fill the anticipated vacancies.  Please submit application as soon as possible.  Applications can be submitted on the Internet. Visit the City web site at

Examination Components and Their Weights

  • Experience and Training: Pass/Fail
  • Oral Interview: 100%
  • Character Investigation: Pass/Fail
  • Medical Examination: Pass/Fail

O.C. 3384
October 22, 2021

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