In May 2017, Colorado’s Metro Wastewater Reclamation District (Metro District) opened its Northern Treatment Plant (NTP), one of the most advanced treatment facilities in the western United States. The overall $475 million NTP program included a $302 million treatment facility that was delivered $35 million less than original budget estimate, and design and construction of the South Platte Interceptor, a nearly seven-mile gravity pipeline that conveys flow to the NTP. With capacity to treat 24 mgd, the NTP can serve 300,000 residents with room to expand to 750,000. Completion of the NTP ensures safe, reliable, and cost-effective water reclamation for the approximately 1.8 million Coloradans served by the Metro District.
Meeting the very stringent effluent limits established to protect the water quality of the South Platte River, the facility includes biological nutrient removal and tertiary treatment, including granular media filtration to meet effluent limits of 10 mg/L for total nitrogen and 1 mg/L for total phosphorus.