Two reservoirs which provide drinking water to hundreds of homes across Belfast and Co Antrim have been put out of service while oil exploration is carried out nearby.
Northern Ireland Water has assured councillors that the reservoirs at Woodburn Forest near Carrickfergus will not be contaminated by an exploratory borehole 350 metres away, but said it had put the two reservoirs offline for the duration of the project.
Following a meeting of Antrim and Newtownabbey Borough Council, campaigners from Stop The Drill said they learned that the "potentially contaminated" water from the reservoirs is now being diverted into Belfast Lough.
"This is an admission that NI Water do not trust that the Woodburn site is a 'zero discharge site'," they said.
Protesters opposed to the controversial Woodburn Forest borehole have warned that the "tide is turning" against InfraStrata after revealing that a local resident is poised to take a legal challenge against the scheme.
Dear Minister Durkan, As the founder and chief technology officer of Water Defense, we are writing to you urgently about the exploratory well that your government is currently going to allow 350 metres from the North Woodburn Water Reservoir that is the drinking water source for 131,000 people, including Belfast City centre.