South Dakota invests billions to secure drinking water for decades ahead
Major water infrastructure projects are underway across South Dakota to secure long-term drinking supplies. The expansions aim to meet growing demand and ensure high-quality water for decades. Several regional systems are investing billions to upgrade pipelines, wells, and treatment capacity. The Lewis & Clark Regional Water System is expanding with a $150 million upgrade. A new well will tap into an aquifer 140 feet underground, boosting the system’s ability to deliver treated Missouri River water. Currently, it supplies 44 million gallons daily to 350,000 people across 20 communities.
The WEB Water system is also increasing capacity with an $82 million project. By 2030, it will handle 17 million gallons per day, up from its current output.
Two larger projects are in development. The Western Dakota Regional Water System plans a 72-inch pipeline to the Black Hills, involving 56 municipalities. Meanwhile, the Dakota Mainstem system proposes an even bigger pipeline—up to 96 inches wide—to serve eastern South Dakota and neighbouring states.
Together, these upgrades could cost tens of billions. Once complete, they will provide reliable water for hundreds of thousands of residents over the next 40 to 50 years. The combined efforts will raise total water flow to 60 million gallons per day by 2030. Both existing and new systems are being scaled up to handle future needs. Officials describe the work as essential for sustainable growth in the region.
