Chicago features a mature, highly developed urban infrastructure system.
* **Water & Sanitation:** The city draws its drinking water from Lake Michigan, processed by massive treatment facilities like the Jardine Water Purification Plant. To manage storm runoff and prevent combined sewer overflows, the city relies on the monumental Tunnel and Reservoir Plan (TARP), commonly known as the "Deep Tunnel." * **Electricity & Gas:** Commonwealth Edison (ComEd) provides electrical service, while Peoples Gas provides natural gas to city residents. * **Connectivity:** Chicago is a major hub for global internet traffic, featuring extensive broadband access and numerous colocation data centers, particularly near the downtown financial exchanges to facilitate high-frequency trading.