Welcome! Before You Visit Our Offices…

  • View a list of online services for our department and others you can access from your home or office.
  • If you need to visit our offices in the County Administration Building in person, please note:
    • Visitors are required to review a health screening checklist before entering. If you have COVID-19 symptoms and/or known exposure to someone diagnosed with COVID-19 within the past 14 days, please remain at home. 
    • To access our office on the 5th floor, visitors must check in at the Security Desk to receive a visitor badge, and be accompanied by a staff member.

For further questions, call our department at 636-949-7455. Thank you.

About Us

The County Auditor’s primary function as an internal auditor is to assist all members of the County Council, the County Executive, and County Directors and Elected Officials in the effective discharge of their responsibilities by providing them with independent analyses, appraisals, recommendations, and pertinent comments concerning policies, practices, procedures, controls, security of assets and quality and efficiency of performance in county government.


In fulfilling this function, the County Auditor's Office will:

  • Review and appraise the soundness, adequacy and application of accounting, financial, security and operating controls of all areas of the county and promote effective control at reasonable cost.
  • Ascertain the extent of compliance with established policies, practices and procedures and promote improvements where possible.
  • Ascertain the extent to which assets are accounted for and protected from loss.
  • Ascertain the reliability of management data developed with the county.
  • Appraise the quality of performance.
  • Appraise the efficiency and effectiveness of operations and recommend improvements where appropriate.

The St. Charles County Auditor's office has adopted the International Standards for the Professional Practice of Internal Auditing, the Statement of Responsibilities of Internal Auditors, and The Institute of Internal Auditors Code of Ethics. A copy is on file in the County Offices (Ordinance Number 97-105). The Auditor's Office has additional responsibilities as defined by St. Charles County's Charter and Revised Ordinances.