Public Notice To: Customers of Illinois-American Water Company - Notice of Proposed Change in Rates Illinois American Water hereby gives notice to the public that it has filed with the Illinois Commerce Commission a proposed change in water and wastewater rates for all operating areas served by the Company, effective approximately January 1, 2027, with a second rate step effective January 1, 2028. The proposed rates would increase the overall water or wastewater service revenue for the Company’s districts below as follows: Effective January 1, Effective January 1, 2027 2028 Total Increase Central Water 23.0% 2.4% 25.4% Pekin Water 40.4% 5.0% 45.4% Central Wastewater 45.3% 5.3% 50.6% Chicago Metro Wastewater 3.5% 1.0% 4.5% The proposed changes, which include changes in design of the rates, affect charges for customers in all service classifications (including metered water service, wastewater service, private fire service and public fire service) in the districts listed above. The estimated bill impact of the proposed changes may vary based on multiple factors, including, but not limited to, meter size, usage volume, service classification, fire protection district, and other factors. Illinois Commerce Commission procedures for intervention are contained in its Rules of Practice, 83 Ill. Admin. Code Part 200. In addition, customers may request a public forum regarding this proposed increase by making a written request to the Illinois Commerce Commission in accordance with procedures specified in Section 8-306(n) of the Public Utilities Act (220 ILCS 5/8-306 (n)). A copy of the proposed rate schedules may be inspected by any interested party at any of the Illinois American Water offices. Additionally, customers may contact Illinois American Water at (800) 422- 2782 for an explanation regarding how the proposed changes might impact their monthly bill. Customers should be advised that the Illinois Commerce Commission may alter or amend the rates or conditions of service after hearings held pursuant to 83 Ill. Admin Code Part 200 and may increase or decrease individual rates in amounts other than those requested by Illinois American Water. You may obtain additional information either directly from Illinois American Water, 300 N. Water Works Drive, Belleville, Illinois 62223, tel: (800) 422-2782, or by addressing the Chief Clerk of the Illinois Commerce Commission, 527 East Capitol Avenue, Springfield, Illinois 62701, or via the Illinois Commerce Commission’s website at www.icc.illinois.gov. Information is also available at Illinois American Water’s web site, www.illinoisamwater.com.