The Village of Addison is implementing a major project to separate combined sewers in the Home Addition area, which is the largest remaining combined sewer tributary in the community. The project includes separating the area's existing combined sewer system, which currently manages both wastewater and stormwater runoff, into separate sanitary and storm sewer systems. About three miles of new storm sewer, ranging from twelve to sixty inches in diameter, will be installed and directed to Salt Creek through an existing 84-inch relief storm sewer. To connect to the existing 20-foot-deep relief sewer, two custom-made junction chambers (10-foot by 12-foot and 8-foot by 10-foot) have been installed. Another key part of the project is building a stormwater detention facility at Cherokee Park, which is the lowest point of the drainage basin and the area most vulnerable to flooding. Since June of 2025, the contractor has completed approximately two and a half miles of storm sewer installation. The remaining sewer work and excavation of the detention pond are expected to be finished in the coming months. Along with storm sewer upgrades, lead water services found during construction are being replaced. So far, 65 lead water services have been taken out of the Village's water system. Once finished, the Village’s sanitary sewer system will experience significantly lower flows during wet weather. This decrease in flows will help prevent basement backups, street flooding, and combined sewer overflow discharges previously suffered by the Village. The project will also lessen the volume of stormwater runoff treated at the AJL Wastewater Treatment Plant. It remains on schedule and is expected to be completed by summer 2026. 

Phase 2 of the Village of Fox Lake's Lead Service Line Replacement Program is nearing completion. This program aligns with the 2024 updates to the EPA's Lead and Copper rules, which require water providers to begin replacing lead and galvanized water service lines. The original water system in the project areas dates back to 1929, when lead water services were common. To comply with regulations, all lead and galvanized water services are being replaced from the water main to the customer's meter inside the house. Both phases of this program are funded through the IEPA's Public Water Supply Loan Program, in which the Village has received principal forgiveness for the entire $5.1 million loan. To date, the program has replaced approximately 350 water services, and Phase 2 is expected to be completed by June 2026. 

The Village of Roselle has begun construction of the Biological Nutrient Removal Upgrade Project at its Jerry A. Botterman Sanitary Treatment Plant. The project incorporates recommendations outlined in the Village’s 2022 Wastewater Facility Plan, which ensure compliance with future wastewater effluent regulations and improve the facility's reliability by replacing aging equipment. The improvements include converting the existing Oxidation Ditch to a Biological Nutrient Removal process for phosphorus and nitrogen removal, construction of a Chemical Feed Building to allow Alum to be used to aid in the phosphorus removal process, and replacement of the Influent Screens and Final Clarifier equipment. John Burns Construction Company began construction of the Chemical Feed Building in the fall of 2025, work is progressing as scheduled. Over the next year, Trotter and Associates will continue to work closely with the Village and John Burns Construction Company to help ensure the project’s success. 

Trotter and Associates, Inc. is partnering with the Village of Sussex, Wisconsin, on the 2025 WPCF Improvements Project, which aims to modernize critical systems at the wastewater treatment facility. Upgrades to screening, filtration, and aeration equipment are being implemented to enhance facility operations and maintenance.  With the hard work and coordinated efforts of Sabel Mechanical LLC and Pieper Electric, Inc., the project is expected to be completed on time.

The $1.36 million Village of Algonquin Braewood Lift Station Rehabilitation project is complete. Delivered in collaboration with the Village of Algonquin and Dahme Mechanical Industries, Inc., the project was completed on schedule and within 1.4% of the original construction contract amount. Following a 2022 condition assessment by Trotter and Associates, Inc. (TAI), improvements were identified to increase lift station and force main capacity. The force main replacement was completed in 2024, followed by lift station rehabilitation and system integration. Improvements included upsized pumps, VFDs, and piping; replacement of the grinder, flow meter, and odor-control equipment; electrical and HVAC upgrades; and connection to the new 16-inch force main. Station capacity increased from 1,500 GPM to 5,000 GPM, supporting future Village development.