Kalispell Advanced Wastewater Treatment Plant Upgrade

Kalispell Advanced Wastewater Treatment Plant Upgrade

ACEC 2011 Engineering Excellence National Recognition Award
2011 ACEC-Montana Engineering Excellence Award in Water and Storm Water Category

The City of Kalispell, Montana, needed to expand and upgrade its EPA-award winning Advanced Wastewater Treatment Plant (AWWTP) and turned to a team of consultants led by Morrison-Maierle to design and oversee construction of an $18.25 million expansion. Since it was built in 1991 as a pioneering facility in cold climate biological nutrient removal, the AWWTP has significantly reduced the nutrient load to the Flathead Lake watershed. This expansion project addressed increasing flows from a rapidly expanding population in the service area, the potential for significantly more stringent effluent limits in the near future, a community concern regarding off-site odors and aging plant infrastructure.

The expanded facility is capable of treating a peak wet-weather flow of 22 mgd and achieving effluent nutrient standards of less than 0.3 mg/L total phosphorus and less than 10 mg/L total nitrogen. In addition, the community’s odor complaints have been nearly eliminated. The Kalispell AWWTP, known nationally for its outstanding performance and effluent quality, is now an expanded facility that balances the community’s need for growth over a 20-year period with the need to protect Montana’s environment by achieving greater levels of nutrient removal and odor control.

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