The Illinois Commerce Commission currently regulates 25 water, 3 sewer, and 12 combination water and sewer investor -owned utilities. While the number of regulated utilities is a small percentage of the 1,800 public water suppliers and 900 public sanitary sewage systems with treatment facilities in the state, these investor-owned utilities provide water service to approximately 923,000 people and sewer service to approximately 113,000 people.

Certified Utilities In Illinois