The City of Great Falls, Montana has agreed through a consent decree to control wastewater discharges that generate high levels of toxic gas in the City?s sewer system. The City has also agreed to make improvements to its wastewater treatment system to reduce raw sewage overflows in the city and the Missouri River. The City is alleged to have failed to control discharges from a significant industrial user in its service area (Malteurop North America, Inc.), which is a malting plant. The discharges from the malting plant are alleged to have caused high levels of hydrogen sulfide to form in the City of Great Falls? sewer system, and the toxic gas is alleged to have caused corrosion in the sewer system. The consent decree also addresses alleged violations associated with persistent sewage overflows in the City of Great Falls wastewater system. These include several dozen incidents of raw sewage backing up into residences and buildings and flowing in city streets, as well as discharges of raw or partially treated sewage to the Missouri River. The partially treated sewage discharges were a result of infiltration and inflow overloading the flow capacity of the City?s wastewater treatment plant, and the City bypassing parts of the treatment system. The City has agreed to remedy the overflows and discharges by increasing capacity at its treatment plant, improving the enforcement of pretreatment requirements at facilities that cause blockages, evaluating the capacity and condition o