The Department of the Environment has approved emergency funding of over €300,000 to help deal with a cryptosporidium outbreak.
It will be used to help fund the installation of a temporary UV and filtration system at a source of the Roscommon central water scheme in Ballingard outside Roscommon town.
The funding will allow locals to once again safely use the water, after a weeks-long boil water notice.
A contractor has been appointed for the installation of the new temporary system.
It is expected to be up and running within the next ten weeks.
The boil water notice will stay in place until then.
Roscommon County Council says work will now continue on the installation of four new water supply schemes.
The water supply schemes are estimated to cost over €15m, to help provide a permanent solution to the water problems.
Up to 14 people have fallen ill since the outbreak began three weeks ago.