All of Brunswick County's water customers and wholesale water customers receive either all or part of their water from the Northwest Water Treatment Plant. Within the Southport, St. James, Oak Island, and Caswell Beach areas, water from the Northwest Water Treatment is blended with water from the Highway 211 Water Treatment Plant to serve customers. The Highway 211 Water Treatment Plant sources its water from groundwater wells. Bald Head Island has its own treatment plant, but supplementary water is supplied by the 211 Water Treatment Plant, or blended water from both county plants. All other customers in the County receive their water solely from the Northwest Water Treatment Plant.
Note: As of June 2022, Brunswick County's current wholesale customers include Bald Head Island, Holden Beach, Brunswick Regional Water and Sewer (H2Go), Oak Island, Ocean Isle Beach, Shallotte, and Southport.