An official website of the City of Chicago

The .gov means it's official

Municipal government websites often end in .gov or .org. Before sharing sensitive information, make sure you're on a City of Chicago government site.

The site is secure.

The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Get the new, updated COVID-19 and flu vaccines. They're safe, effective, and can be taken together. Learn more at Chicago.gov/COVIDVax.

Operation & Construction Services: 5500 Series

5500 Chemical Engineering Series