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Could Blue Grass’s approach to modernizing its lagoon system help your facility?
The City of Blue Grass has commissioned a modernized lagoon system that is now shaping regulatory policy across Iowa. Working with Iowa American Water, CMT, and Nexom (an Axius Water company), the community implemented a redesigned submerged attached growth reactor (SAGR) system that cuts footprint and construction costs by more than 50% while achieving reliable cold‑weather ammonia removal.
The Iowa Department of Natural Resources has since approved the revised SAGR sizing criteria used at Blue Grass for statewide application, paving the way for more than 700 lagoon-based facilities in Iowa and thousands across the U.S. to pursue cost‑effective compliance upgrades.
Read the full story published as a featured piece in the January 2026 issue of Water Environment & Technology (WE&T) magazine: A BIG BOON FOR SMALL LAGOONS – How one Iowa lagoon upgrade became a statewide model for cost-effective ammonia removal.
About Axius Water
Axius Water was founded in 2019 by KKR’s Global Impact Fund, in partnership with XPV Water Partners. Axius’ differentiated products and services improve the effectiveness of the wastewater treatment process, thereby measurably improving the quality of treated water. The platform is expanding globally as it builds a diversified portfolio of operating companies that offer leading solutions that improve the overall wastewater management processes. For additional information about Axius Water, please visit www.axiuswater.com.
