Seddon gets its water from the Black Birch Stream.
Photo: LDR / Chloe Ranford
The water reforms could see Blenheim and Picton lumped in with the eastern and lower parts of the North Island, sharing the cost of water upgrades with the likes of Greater Wellington, Hawke's Bay and Gisborne.
Meanwhile, people in Seddon and Ward, in South Marlborough, could be splitting bills with the rest of the South Island, including Christchurch and Queenstown.
As it stands, the Three Waters shake-up could, in the long-term, leave residents in South Marlborough paying $380 more a year in water bills than those in the upper half of the region.