 Under the Water Act 1973, ownership of the TVCWB's reservoirs, which included the three Baldersdale reservoirs and two others — Selset and Grassholme — on the River Lune a short distance to the north, was transferred to the Northumbrian Water Authority (NWA).In 1989, NWA was privatised, and the reservoirs are now owned and operated by Northumbrian Water.All five reservoirs supply a water treatment works at Lartington, just south of Cotherstone.