These may be used to separate solid waste from water in wastewater and sewage treatment. Such residues are also present in conventional wastewater treatment effluent. Municipal and industrial wastewater are typically treated at wastewater treatment plants. Pyrethroids are unaffected by conventional secondary treatment systems at municipal wastewater treatment facilities. Kalogeo made products related to treating biomass, sludge, and wastewater. There are three major municipal wastewater treatment plants. This makes it difficult to grow enough sludge for a wastewater treatment reactor. These structures are designed to treat wastewater and municipal solid waste. Sewer service is handled by the City of Missoula Wastewater Division. Disinfection is the last step in the tertiary treatment of wastewater or drinking water. Insects emerging from this wastewater may spread pathogens to nearby water sources. Nitrification also plays an important role in the removal of nitrogen from municipal wastewater. The district provided water, wastewater, trash collection. Such efforts include installing sand filtration systems for the stores' wastewater. This is believed to be due to the deep disposal of wastewater from fracking.