In 1967, the Sanitary Board was established. Later that same year, an agreement between the board and American Suburban Utilities allowed for the construction of the wastewater plant at 96th street and then River Road, now Hazel Dell Parkway. In 1968, a federal grant for $220,500 and a state grant for $110,250 was obtained to aid in the construction of the new plant. In 1969, the town of Carmel bought the 96th Street plant from the Keystone Square Company for the amount of $880,480.
Since the 1970s, the wastewater plant has gone through several expansions and improvements including the installation of a UV disinfection system in 2004 and in 2006 the first Bio-Pasteur process to pasteurize solids in the United States, earning the 2006 Honors Award for Engineering Excellence awarded by the American Council of Engineering Companies of Indiana.
Aerial view of the newly expanded
Wastewater Treatment Plant, 2021.
2021: To meet Carmel’s continued growth, the Wastewater Treatment Plant, located at 96th Street and Hazel Dell Parkway, expanded its capacity from 12 million gallons per day to 14 million gallons per day. The expansion included the addition of two new aeration tanks, and one final clarifier along with piping/pump replacements and additions. The project was financed through a low interest loan (2.5%) offered through the Indiana Finance Authority State Revolving Loan Fund.
Since the completion of the expansion project, a series of improvement projects began, allowing the plant to biologically or chemically remove phosphorus from Carmel’s wastewater effluent. Effective December 1, 2021, final effluent limitations of phosphorus are permit-regulated by the Indiana Department of Environmental Management.
2021 Wastewater Treatment Plant expansion
Two new Aeration Tanks
One new Final Clarifier