WaterTree is a full service water treatment company. Founded in 1939, Watertree supplies water solutions to the greater Black Hills area with locations in Rapid City and Spearfish South Dakota.. Although water softening and bottled water are large parts of the business, WaterTree specializes in Iron and Troubled Waters. WaterTree is a proud dealer for Hellenbrand equipment as well as many other complimentary products. WaterTree Inc is also the parent of The Pool & Spa Center, dealer of Hot Spring and Caldera Spas as well as in ground and above ground pools and accessories.