Published Thursday, 02 February 2012
Altnagelvin taps are replaced over the bug. (© UTV)
A baby died from the infection at the Londodnerry hospital before Christmas.
All taps there are now being replaced, a statement from the Public Health Agency said.
It continued: "Water sample results for the Western Trust show that Pseudomonas has been detected in a small number of water outlets in the neonatal unit at Altnagelvin.
"As in all neonatal units, including Altnagelvin, steps had already been taken to ensure that babies are not coming into contact with the water supply.
"Only sterile water is being used for direct care of babies and a range of very strict infection control measures are also in place."
A different strain of the bacteria was responsible for the deaths of three infants at the Royal Jubilee hospital last month.
The Public Health Agency said that no babies at Altnagelvin are infected, but two have the bacteria on their skin.
The statement adds: "It is not clear at this stage exactly what the implications are of finding Pseudomonas in water supplies and what longer-term monitoring is required.
"National guidance is being developed urgently for the whole of the UK, with experts taking account of all of the scientific evidence available, including the evolving situation in Northern Ireland."