Irish Water was due to carry out the improvements next year, however the project has been halted as a result of a ruling by An Bord Pleanála.
Fianna Fáil TD for Sligo-Leitrim Eamon Scanlon raised concerns over the decision.
He said: "Lough Talt provides the water supply for almost 10,000 people in Ballymote, Ballisodare and Tubbercurry. Plans for a new water treatment plant, which would rectify a number of problems, had been lodged but have now been refused by An Bord Pleanála, which claims the lake is a Special Area of Conservation.
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"We have had to deal with a series of water issues in south Sligo in recent years – in 2015 the water supply was found to have elevated levels of Thihalomethanes (THMs) and the EPA blamed inadequate Cryptosporidium treatment. This was to be addressed through the construction of a new water treatment plant. But this has now been stalled as a result of this Bord Pleanála ruling."
(CD/LM)
