History
The City’s first wastewater treatment plant, portions of which still serve the City as the Doty Street Pumping Station, was placed in service in 1913 about 1,500 feet from the current site. The most recent update was done in 2018 and makes it the seventh major project completed on the current site, including projects in 1928, 1949, 1964, 1975, 2008, 2013 and 2018. Many elements of the 1949, 1964, and 1975 facilities were adaptively reused for the 2008 plant upgrade to provide added features at little or no cost, saving the ratepayer millions of potential additional costs. Then in 2013, the City added high-strength waste receiving for trucked-in waste to provide supplemental biogas production to expand its reuse capabilities. Finally in 2018, a high-rate ammonia removal process known as Deammonification was installed on the sidestream of the dewatering process to promote efficient biological nutrient removal in the main treatment plant. Currently the plant is under construction for the eighth time to add a renewable natural gas (RNG) system and a biosolids dryer.