Update: Our office at 69 W. Washington St. is open, but with limited staffing to encourage social distancing and prevent the spread of COVID-19.  However, services are still being provided.  

All payments shall be submitted through the new  for your Certificate of Operation (COO). Enter the required information from the Statement of Account that you received.  Note that in accordance with Section 30-186 of the Cook County Municipal Code, “A current certificate of operation shall be required for any person to use or operate any fuel-burning, combustion, process equipment, process, or air pollution control device.”. If you have any questions about your COO please email certificateofoperations@cookcountyil.gov or call (312)-603-8200.