ALTON - Illinois American Water’s Work To Separate The Alton Combined Sewer System And Install New Sanitary Sewers Continues. Here is this week's update.

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Piasa Valley Area:

9th Street will be closed from east of Alby Street intersection east to George Street. 10th Street is closed between Alby Street and George Street with pavement restoration happening. Brick pavement restoration is currently occurring on 8th Street and some rework of the brick placement on 7th Street. The intersection of 10th Street and Alby Street will close early next week to all traffic for several days to facilitate a storm sewer repair. This work is scheduled to start Tuesday, 6/28/22. Please drive carefully in this area, as there is a lot of construction equipment moving around the different work areas.

Piasa Valley Area

The sewer installation work in the area of State Street and Grand Avenue is nearing completion. The pavement restoration work will start early next week and should be finished by week’s end.

State St.

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Starting on the week of July 5th, 2022, US Route 67 (Piasa Street) will be closed from 20th Street/College Avenue south to 3rd Street. The intersection at 10th Street and US Route 67 (Piasa Street) will remain open to facilitate traffic flow in and out of Tony’s Restaurant. Access to the Lovejoy Banquet Center will also be maintained, with additional information on access to their parking lot being released as the work progresses toward their property. All other traffic on US Route 67 (Piasa Street) will be prohibited during this time. Posted detour routes will be in place starting on July 5th. This closure will last roughly one month to allow for sanitary sewer and water main installation work to be completed.


Work kicked off in February 2021 and will continue to progress until 2023. Work includes over six miles of sanitary sewer main is being installed in the Turner Tract, Shields Valley and Piasa Valley areas of Alton. When Illinois American Water acquired the Alton Regional Wastewater system the company made a commitment to address requirements set forth by the Illinois Environmental Protection Agency to remedy combined sewer overflows.

  • The projects in Turner Tract and Shields Valley address 1.69 miles of sanitary sewer main.
  • The work in Piasa Valley began in the spring of 2021.
    • This project includes almost five miles of sanitary sewer main.
    • Work is expected to continue for over two years.
      • This does not mean work will occur in one area for 24 months, but rather, projects will continue to progress throughout neighborhoods during that time period. Signs will be placed ahead of construction to notify customers of upcoming closures.


These closures are necessary for investments to the wastewater system to be completed in a safe manner. At Illinois American Water our team and our contractors work as quickly as possible to minimize inconvenience to our customers. We do our best to minimize the length of construction, but our #1 priority is safety. At times, road and sidewalk closures may be extended to support our commitment to safety.


Customers should call 800-422-2782 with questions.

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Mar 28, 2022 | Alton Sewer Separation Project Update Ror Mar. 28, 2022

Apr 11, 2022 | ILAW Alton Sewer Separation Project Update For April 11, 2022

May 4, 2022 | ILAW Alton Sewer Separation Project Update - Turner Tract Area Completed

Mar 14, 2022 | Illinois American Water’s Work To Separate The Alton Combined Sewer System And Install New Sanitary Sewers Continues

Apr 25, 2022 | Alton Sewer Separation Project Update For The Week Of April 25, 2022