The plant was built in 1939, with major expansions and upgrades completed on the dates below.
Primary Trickling Filters
The two primary trickling filters were constructed from the "bottom up" in 1996 at a cost of $582,000. This consisted of reconstructing the floors, drains, installing new filter media, and the installation of new distribution arms.
Tertiary Trickling Filter
A new tertiary trickling filter was constructed in 1998. The cost of the filter was approximately $1.9 million. It was built to help the plant meet new ammonia regulations adopted in the 1990s by the Department of Natural Resources (DNR).
The U.S. Army Corps of Engineers completed the flood levee project at a cost of approximately 1.9 million dollars. The levee was built specifically to protect the Water Reclamation Facility and the downtown area from the 100 year flood level. The spring floods of 2001 were the first real test and the levee served us well.