The land at West Camp, Balivanich, had been part of a rockets testing facility.
The Bank of Scotland in Benbecula is due to close in July.
The nine-year-old has been flown from the Western Isles to hospital in Glasgow.
Scottish Water said about 1,000 homes were affected, with their water having an oily smell and taste.
Schools are closed and some health services disrupted due to the issue caused by a fuel leak.
Ian Norris from South Uist has been unable to attend two hospital appointments due to travel issues.
