This industry comprises establishments primarily engaged in operating water treatment plants and/or operating water supply systems. The water supply system may include pumping stations, aqueducts, and/or distribution mains. The water may be used for drinking, irrigation, or other uses.

Including:

• Canal, irrigation
• Filtration plant, water
• Impounding reservoirs, irrigation
• Irrigation system operation
• Water distribution (except irrigation)
• Water distribution for irrigation
• Water filtration plant operation
• Water supply systems
• Water treatment and distribution
• Water treatment plants