Sewage Treatment Facilities

Establishments in the NAICS 221320 industry primarily engage in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste. The core activities include the removal of contaminants from wastewater and sewage to produce clean water and safe byproducts. This industry is distinguished from related industries by its focus on the treatment and disposal of sewage, rather than the provision of water supply or the management of solid waste.