This project originated in 1988 after the extensive flooding of Salt Creek in 1987 completely flooded the wastewater treatment plant putting it temporarily out of service. Once the floodwaters were under control, the City of Elmhurst had all the tanks and critical electrical components raised two feet higher than the highest level of floodwaters. The expansion of the wastewater treatment plant to its present capacity was done at the same time. Due to limited land availability, this expansion had to be constructed within the existing facilities. Extensive sheeting and shoring was required to protect the existing structures and piping. Temporary pumping and process systems had to be installed and maintained to insure that the effluent quality would not be compromised during the plant upgrade. The wastewater treatment plant consists of eight screw pumps, ten aeration basins, four primary clarifiers, six secondary clarifiers, three tertiary clarifiers, and two anaerobic digesters.

JJH has maintained a solid relationship with the City of Elmhurst over the last 20 years, building multiple projects totaling more than $25 million including several design-build projects with Lintech Engineering LLC.