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Internal Audit Reports

The County Auditor performs internal audits of County departments and elected officials. These audits can assess weaknesses in the control over County resources and help to provide DuPage County taxpayers with better services at lower cost. A report of each audit, detailing the conditions found and the Auditor's recommendations, is distributed to the management of the department, the County Board or Elected Official.

The County Auditor recognizes that it is a difficult balance between providing transparency to the public through internal audit reports and providing insight to those interested in exploiting the County's vulnerabilities for their personal benefit. As some audit reports identify internal control weaknesses within County operations, audit reports may not be immediately released to the public until the issues have been addressed.

Many of the audit reports presented on this website do not display the attachments and addendums contained in the original audit report. This is to prevent detailed information regarding County operations, internal control weaknesses or personally identifiable information about County employees from being disclosed.

The County Auditor assigns a number to an audit at the commencement of each audit. In some cases, for a variety of reasons, these audit procedures may not result in an audit report being issued resulting in gaps in the audit numbers noted in the reports.

The list of internal audits performed by the County Auditor presented below is updated on a quarterly basis and contains reports issued for a three-year period. As previously noted, internal audits performed during the prior 12 months are not listed on this website in order to provide an opportunity for the subject of the audit to address the issues identified in the audit. You can receive a copy of any audit report issued prior to this period by sending an e-mail to auditor@dupageco.org, by calling 630-407-6075, or by writing to:

Office of the DuPage County Auditor
421 North County Farm Road
Wheaton, IL 60187

Audit Reports

Retention Benefit Payments Audit- PPE 8-25-17; Issued 8/31/17
Erroneous Invoice Entry Audit - Stormwater; Issued 8/25/17
Erroneous Invoice Entry Audit - Special Fund; Issued 8/18/17
Retention Benefit Payments Audit- PPE 8-11-17; Issued 8/16/17
Erroneous Invoice Entry Audit - Jail; Issued 8/16/17
Duplicate Invoice Entries Audit - Drainage; Issued 8/15/17
County Recorder Monthly Revenue Statement Audit; Issued 8/14/17
Retention Benefit Payments Audit- PPE 7-28-17; Issued 8/2/17
ETSB Accounts Payable Audit; Issued 7/28/17
Public Works Non-Compliance with Procurement Ordinance; Issued 7/28/17
Community Services Imprest Bank Reconciliation Audit; Issued 7/26/17
DSSA Bank Reconciliation Audit; Issued 7/26/17
WIOA Bank Reconciliation Audit; Issued 7/26/17
Community Services Imprest Bank Reconciliation Audit; Issued 7/19/17
DSSA Bank Reconciliation Audit; Issued 7/19/17
WIOA Bank Reconciliation Audit; Issued 7/19/17
Retention Benefit Payments Audit- PPE 7-14-17; Issued 7/19/17
ETSB Accounts Payable Audit; Issued 7/5/17
Retention Benefit Payments Audit- PPE 6-30-17; Issued 7/5/17
County Recorder Monthly Revenue Statement Audit; Issued 7/3/17
County Recorder Monthly Revenue Statement Audit; Issued 7/3/17
Community Services Imprest Bank Reconciliation Audit; Issued 6/30/17
Community Services Imprest Bank Reconciliation Audit; Issued 6/30/17
Community Services Imprest Bank Reconciliation Audit; Issued 6/30/17
DSSA Bank Reconciliation Audit; Issued 6/29/17
WIOA Bank Reconciliation Audit; Issued 6/29/17
DSSA Bank Reconciliation Audit; Issued 6/29/17
WIOA Bank Reconciliation Audit; Issued 6/29/17
WIOA Bank Reconciliation Audit; Issued 6/29/17
County Recorder Monthly Revenue Statement Audit; Issued 6/28/17
County Recorder Monthly Revenue Statement Audit; Issued 6/28/17
County Recorder Monthly Revenue Statement Audit; Issued 6/22/17
Retention Benefit Payments Audit- PPE 6-16-17; Issued 6/21/17
County Sheriff - Chancery Sales Trust Account Audit; Issued 6/19/17
County Sheriff - Viking Tobacco Account Audit; Issued 6/19/17
County Sheriff - Retired Canine Assistance Account Audit; Issued 6/19/17
County Sheriff - Internet Auction Account Audit; Issued 6/19/17
County Sheriff - Money Laundering Seizure Account Audit; Issued 6/19/17
County Sheriff - Sex Offender Account Audit; Issued 6/19/17
County Sheriff - JEZ Account Audit; Issued 6/19/17
County Sheriff - Inmate Account Audit; Issued 6/19/17
County Sheriff - Arson Task Force Account Audit; Issued 6/19/17
County Sheriff - Commissary Account Audit; Issued 6/19/17
County Sheriff - Replevin and Levy Account Audit; Issued 6/19/17
County Sheriff - Drug Traffic Prevention Account Audit; Issued 6/19/17
County Sheriff - Drug Traffic Seizure Account Audit; Issued 6/19/17
County Sheriff - Extradition Account Audit; Issued 6/19/17
County Sheriff - Investigative Account Audit; Issued 6/19/17
DSSA Bank Reconciliation Audit; Issued 6/15/17
MHC Contracts and Invoices Audit; Issued 6/9/17
Retention Benefit Payments Audit- PPE 6-2-17; Issued 6/7/17
ETSB Accounts Payable Audit; Issued 6/6/17
Retention Benefit Payments Audit- PPE 5-19-17; Issued 5/30/17
Retention Benefit Payments Audit- PPE 5-5-17; Issued 5/10/17
ETSB Accounts Payable Audit; Issued 5/3/17
Retention Benefit Payments Audit- PPE 4-21-17; Issued 4/25/17
Duplicate Invoice Entries Audit - Graybar; Issued 4/13/17
Retention Benefit Payments Audit- PPE 4-7-17; Issued 4/12/17
ETSB Accounts Payable Audit; Issued 3/31/17
Retention Benefit Payments Audit- PPE 3-24-17; Issued 3/29/17
Duplicate Invoice Entries Audit - Animal Control; Issued 3/16/17
Retention Benefit Payments Audit- PPE 3-10-17; Issued 3/15/17
ETSB Accounts Payable Audit; Issued 3/3/17
Community Services Imprest Bank Reconciliation Audit; Issued 3/1/17
DSSA Bank Reconciliation Audit; Issued 3/1/17
WIOA Bank Reconciliation Audit; Issued 3/1/17
Retention Benefit Payments Audit- PPE 2-24-17; Issued 2/28/17
DSSA Bank Reconciliation Audit; Issued 2/27/17
Retention Benefit Payments Audit- PPE 2-10-17; Issued 2/15/17
ETSB Accounts Payable Audit; Issued 2/8/17
Retention Benefit Payments Audit- PPE 1-27-17; Issued 2/7/17
Retention Benefit Payments Audit- PPE 1-13-17; Issued 2/7/17
Retention Benefit Payments Audit- PPE 12-30-16; Issued 2/7/17
Community Services Imprest Bank Reconciliation Audit; Issued 1/10/17
DSSA Bank Reconciliation Audit; Issued 1/10/17
WIOA Bank Reconciliation Audit; Issued 1/10/17
ETSB Accounts Payable Audit; Issued 12/30/16
Retention Benefit Payments Audit- PPE 12-16-16; Issued 12/22/16
Community Services Imprest Bank Reconciliation Audit; Issued 12/20/16
DSSA Bank Reconciliation Audit; Issued 12/20/16
WIOA Bank Reconciliation Audit; Issued 12/20/16
Retention Benefit Payments Audit- PPE 12-2-16; Issued 12/8/16
ETSB Accounts Payable Audit; Issued 12/6/16
Community Services Imprest Bank Reconciliation Audit; Issued 11/29/16
DSSA Bank Reconciliation Audit; Issued 11/29/16
WIOA Bank Reconciliation Audit; Issued 11/29/16
Retention Benefit Payments Audit- PPE 11-18-16; Issued 11/22/16
Retention Benefit Payments Audit- PPE 11-4-16; Issued 11/8/16
Circuit Court Document Storage Fund - Logicalis Non-Compliance with Procurement Policy Audit; Issued 11/2/16
Retention Benefit Payments Audit- PPE 10-21-16; Issued 11/1/16
ETSB Accounts Payable Audit; Issued 11/1/16
Off-Track Betting Fees Audit; Issued 10/25/16
Retention Benefit Payments Audit- PPE 10-7-16; Issued 10/12/16
Erroneous Ciber Invoice Payment Audit; Issued 10/11/16
Community Services Imprest Bank Reconciliation Audit; Issued 10/5/16
DSSA Bank Reconciliation Audit; Issued 10/5/16
WIOA Bank Reconciliation Audit; Issued 10/5/16
ETSB Accounts Payable Audit; Issued 9/30/16
Retention Benefit Payments Audit- PPE 9-23-16; Issued 9/28/16
Circuit Court Document Storage Fund - Genus Technologies Non-Compliance with Procurement Policy Audit; Issued 9/23/16
Retention Benefit Payments Audit- PPE 9-9-16; Issued 9/20/16
Unauthorized Corrected Invoice Audit; Issued 9/7/16
ETSB Accounts Payable Audit; Issued 9/2/16

Retention Benefit Payments Audit- PPE 8-26-16; Issued 8/31/16
Community Services Imprest Bank Reconciliation Audit; Issued 8/29/16
DSSA Bank Reconciliation Audit; Issued 8/29/16
WIOA Bank Reconciliation Audit; Issued 8/29/16
Logicalis Invoice Non-Compliance with Procurement Policy Audit; Issued 8/15/16
Retention Benefit Payments Audit- PPE 7-29-16; Issued 8/2/16
ETSB Accounts Payable Audit; Issued 8/2/16
Retention Benefit Payments Audit- PPE 7-15-16; Issued 7/28/16
Community Services Imprest Bank Reconciliation Audit; Issued 7/28/16
DSSA Bank Reconciliation Audit; Issued 7/28/16
WIOA Bank Reconciliation Audit; Issued 7/28/16
Retention Benefit Payments Audit- PPE 7-1-16; Issued 7/6/16
Community Services Imprest Bank Reconciliation Audit; Issued 7/5/16
DSSA Bank Reconciliation Audit; Issued 7/5/16
WIOA Bank Reconciliation Audit; Issued 7/5/16
ETSB Accounts Payable Audit; Issued 7/1/16
Circuit Court Document Storage Fund - Byers Printing Non-Compliance with Procurement Policy Audit; Issued 6/30/16
Retention Benefit Payments Audit- PPE 6-17-16; Issued 6/22/16
Retention Benefit Payments Audit- PPE 6-3-16; Issued 6/8/16
WIOA Bank Reconciliation Audit; Issued 6/3/16
DSSA Bank Reconciliation Audit; Issued 6/3/16
ETSB Accounts Payable Audit; Issued 6/3/16
Community Services Imprest Bank Reconciliation Audit; Issued 6/2/16
WIOA Bank Reconciliation Audit; Issued 6/2/16
Court Interpreter Service Providers Overlapping Hours Audit; Issued 5/24/16
Retention Benefit Payments Audit- PPE 5-20-16; Issued 5/24/16
Non-Compliance with Employee Expense Reimbursement Audit; Issued 5/18/16
Retention Benefit Payments Audit- PPE 5-6-16; Issued 5/10/16
Contract Compliance Audit - Allied Barton; Issued 5/9/16
Submission of Paid Trust & Agency Fund Invoice Audit; Issued 5/9/16
Community Services Imprest Bank Reconciliation Audit; Issued 5/5/16
DSSA Bank Reconciliation Audit; Issued 5/5/16
WIOA Bank Reconciliation Audit; Issued 5/5/16
ETSB Accounts Payable Audit; Issued 4/29/16
Retention Benefit Payments Audit- PPE 4-22-16; Issued 4/28/16
Retention Benefit Payments Audit- PPE 4-8-16; Issued 4/13/16
Circuit Court Document Storage Fund - Byers Printing Non-Compliance with Procurement Policy Audit; Issued 4/8/16
ETSB Accounts Payable Audit; Issued 4/5/16
Retention Benefit Payments Audit- PPE 3-25-16; Issued 3/31/16
Community Services Imprest Bank Reconciliation Audit; Issued 3/17/16
WIOA Bank Reconciliation Audit; Issued 3/17/16
DSSA Bank Reconciliation Audit; Issued 3/16/16
Community Services Imprest Bank Reconciliation Audit; Issued 3/16/16
Retention Benefit Payments Audit- PPE 3-11-16; Issued 3/16/16
DSSA Bank Reconciliation Audit; Issued 3/16/16
Retention Benefit Payments Audit- PPE 2-26-16; Issued 3/2/16
ETSB Accounts Payable Audit; Issued 3/1/16
Duplicate Invoice Entries Audit - County Sheriff; Issued 2/17/16
Triplicate Invoice Entries Audit - Stormwater; Issued 2/17/16
Retention Benefit Payments Audit- PPE 2-12-16; Issued 2/17/16
Community Services Imprest Bank Reconciliation Audit; Issued 2/17/16
DSSA Bank Reconciliation Audit; Issued 2/16/16
WIA Bank Reconciliation Audit; Issued 2/16/16
Duplicate Invoice Entries Audit - Division of Transportation; Issued 2/10/16
Duplicate Invoice Entries Audit - Community Services; Issued 2/10/16
Duplicate Invoice Entries Audit - Stormwater; Issued 2/10/16
Duplicate Invoice Entries Audit - Facilities Management; Issued 2/10/16
Payment of ETSB Credit Invoices Audit; Issued 2/4/16
ETSB Accounts Payable Audit; Issued 2/4/16
Retention Benefit Payments Audit - PPE 1-29-16; Issued 2/3/16
Incorrect Presentation of Employee IMRF Contribution Audit; Issued 2/2/16
Duplicate Billing Audit; Issued 1/26/16
Division of Transportation Erroneous Vendor Agreement Audit; Issued 1/20/16
Retention Benefit Payments Audit - PPE 1-15-16; Issued 1/20/16
Division of Transportation Erroneous Vendor Agreement Audit; Issued 1/14/16
ETSB Accounts Payable Audit; Issued 1/14/16
Retention Benefit Payments Audit - PPE 1-1-16; Issued 1/7/16
Retention Benefit Payments Audit - PPE 12-18-15; Issued 12/23/15
Retention Benefit Payments Audit - PPE 12-4-15; Issued 12/10/15
ETSB Accounts Payable Audit; Issued 12/8/15
Duplicate Invoice Entries Audit; Issued 12/4/15
Retention Benefit Payments Audit - PPE 11-20-15; Issued 11/23/15
Human Resources Invoices Exceeding Purchase Order Threshold Audit; Issued 11/19/15
DSSA Bank Reconciliation Audit; Issued 11/19/15
WIA Bank Reconciliation Audit; Issued 11/19/15
Retention Benefit Payments Audit - PPE 11-6-15; Issued 11/12/15
Duplicate Invoice Entries Audit; Issued 11/10/15
Duplicate Stormwater Invoice Entries Audit; Issued 11/4/15
ETSB Accounts Payable Audit; Issued 11/3/15
DSSA Bank Reconciliation Audit; Issued 11/2/15
WIA Bank Reconciliation Audit; Issued 11/2/15
WIA Bank Reconciliation Audit; Issued 11/2/15
Security Division Invoices Not Paid on Vendor Agreement Audit; Issued 10/29/15
Circuit Court Clerk Invoices Not Paid on Vendor Agreement Audit; Issued 10/20/15
Supervisor of Assessments Payroll Distribution Audit; Issued 10/13/15
Animal Control Payroll Distribution Audit; Issued 10/13/15
ETSB Accounts Payable Audit; Issued 10/1/15
Community Services Invoices Exceeding Purchase Order Audit; Issued 9/25/15
General Fund Special Accounts Unauthorized Invoices Audit; Issued 9/24/15
Duplicate Law Library Invoice Audit; Issued 9/18/15
DSSA Bank Reconciliation Audit; Issued 9/1/15
WIA Bank Reconciliation Audit; Issued 9/1/15
ETSB Accounts Payable Audit; Issued 9/1/15
Veterans Assistance Commission Invoices Not Paid on Vendor Agreement Audit; Issued 8/26/15
Sheriff's Merit Commission Invoices Not Paid on Vendor Agreement Audit; Issued 8/18/15
ETSB Accounts Payable Audit; Issued 8/6/15
DSSA Bank Reconciliation Audit; Issued 8/5/15
WIA Bank Reconciliation Audit; Issued 8/5/15
Duplicate Invoice Entry - Comcast Audit; Issued 7/28/15
Invoice Documentation - North Business & Industrial Council Audit; Issued 7/27/15
Annual Invoice and Puchase Order Audit; Issued 7/22/15
Convalescent Center Erroneous Company Entries Audit; Issued 7/8/15
ETSB Accounts Payable Audit; Issued 7/8/15
Law Library Fixed Asset Audit; Issued 6/29/15
Payroll Exceptions - Payment of Insurance Opt Out Audit; Issued 6/25/15
Unreturned Invoices with Exception Notices Audit; Issued 6/24/15
Pay List Verification Audit; Issued 6/24/15
Unmatched and Unpaid Approved Invoices Audit; Issued 6/24/15
Duplicate Invoice Entries Audit; Issued 6/24/15
Incomplete Correction Transaction Audit; Issued 6/24/15
WIA Bank Reconciliation Audit; Issued 6/11/15
DSSA Bank Reconciliation Audit; Issued 6/11/15
Payroll Exceptions - Erroneous IMRF Deduction Audit; Issued 6/11/15
Convalescent Center Erroneous Company Entry Audit; Issued 6/9/15
Erroneous Accounting Unit Entry Audit; Issued 6/3/15
ETSB Accounts Payable Audit; Issued 6/2/15
Misposted Election Workers Expenditures Audit; Issued 5/18/15
Duplicate Invoice Entries Audit- HR - DOT; Issued 5/14/15
Duplicate Invoice Entries Audit; Issued 5/14/15
Erroneous Accounting Unit Entries Audit; Issued 5/13/15
County Sheriff Unauthorized Invoices Entries Audit; Issued 5/12/15
County Recorder Erroneous Coding of Invoice Audit; Issued 5/12/15
Duplicate Invoice Entries Audit; Issued 5/7/15
ETSB Accounts Payable Audit; Issued 5/5/15
Accrued Employee Benefits Liability at November 30, 2014 Audit; Issued 4/29/15
Animal Care and Control Fixed Asset Audit; Issued 4/28/15
County Sheriff Erroneous Invoice Audit; Issued 4/16/15
Convalescent Center Erroneous Company Entries Audit; Issued 4/15/15
Information Technology Potential Overpayment Due to Contract Non-Compliance Audit; Issued 4/9/15
Triplicate Invoice Entries Audit; Issued 4/9/15
ETSB Accounts Payable Audit; Issued 4/6/15
Payroll Exceptions - Sale of Vacation Time Audit; Issued 4/3/15
OHSEM Fixed Asset Audit; Issued 3/31/15
Coroner's Office Misposted Payroll Expenditures Audit; Issued 3/12/15
Duplicate Invoice Entries Audit; Issued 3/12/15
Matching of Erroneous Invoice Entry Audit - DOT; Issued 3/11/15
Unmatched and Unpaid Invoice Audit; Issued 3/11/15
Payroll Exceptions Audit; Issued 3/5/15
ETSB Accounts Payable Audit; Issued 2/27/15
Duplicate Invoice Entry Audit - Public Works; Issued 2/25/15
Security Division Fixed Asset Audit; Issued 2/24/15
County Clerk Fixed Asset Audit; Issued 2/23/15
Circuit Court Fixed Asset Audit; Issued 2/23/15
Overpayment of Retirement-Related Benefits Audit - County Coroner's Office; Issued 2/18/15
Duplicate Invoice Entry Audit - CDBG; Issued 2/18/15
Community Services Potential Duplicate Payment Audit; Issued 2/10/15
Contract Compliance Audit - Sentinel Technologies; Issued 2/9/15
General Fund Duplicate Invoice Entry Audit; Issued 2/5/15
Division of Transportation Potential Overpayment Audit; Issued 2/5/15
ETSB Accounts Payable Audit; Issued 1/30/15
Duplicate Payment Audit; Issued 1/15/15
General Fund Capital Account Erroneous Entry Audit; Issued 1/13/15
Duplicate Invoice Entries Audit; Issued 1/9/15
Community Services Duplicate Invoice Audit; Issued 1/8/15
Convalescent Center Erroneous Entries Audit; Issued 1/8/15
Convalescent Center Duplicate Invoices Follow-Up Audit; Issued 1/7/15
ETSB Accounts Payable Audit; Issued 12/30/14
Animal Care and Control Employee Transaction Audit; Issued 12/11/14
Finance Department Duplicate Invoice Entry; Issued 12/11/14
Probation Department Duplicate Invoice Entry Audit; Issued 12/9/14
Employee Payroll Transactions Audit; Issued 12/9/14
Workforce Development Grant Duplicate Payment Audit; Issued 12/8/14
ETSB Accounts Payable Audit; Issued 12/4/14
Public Works Duplicate Invoice and Journal Entries Audit; Issued 12/4/14
ETSB Accounts Payable Audit; Issued 11/20/14
Duplicate Invoice Entry Audit; Issued 11/20/14
Convalescent Center Duplicate Invoice Entry Audit; Issued 11/20/14
Information Technology PO Conversion Audit; Issued 11/19/14
DSSA Bank Reconciliation Audit; Issued 11/19/14
Convalescent Center Duplicate Invoices Audit; Issued 11/13/14
Community Development Block Grant Agreement Audit; Issued 11/12/14
Workforce Development Grant Purchase Order Audit; Issued 11/10/14
Public Works Expired Commodities Encumbrances Audit; Issued 11/3/14
Crime Lab Capital Lease Audit; Issued 10/31/14
ETSB Accounts Payable Audit; Issued 10/28/14
Probation Department Grant Invoice Audit; Issued 10/23/14
Probation Department Duplicate Payment Follow-up Audit; Issued 10/23/14
Division of Transportation Potential Overpayment Audit; Issued 10/8/14
ETSB Accounts Payable Audit; Issued 9/25/14
DSSA Bank Reconciliation Audit; Issued 9/16/14
WIA Bank Reconciliation Audit; Issued 9/16/14
Public Works Duplicate Invoice Audit; Issued 9/16/14
Coroner's Office Revenue Audit Follow-Up; Issued 9/15/14
Rejected Payment - Circuit Court; Issued 9/10/14
Stormwater Non-Recorded Purchase Order Audit; Issued 9/4/14
Probation Department Duplicate Payment Audit ; Issued 9/4/14

If you suspect fraud, waste or abuse, call the Audit Hotline at 630-75-AUDIT (630-752-8348), audithotline@dupageco.org