In a closing statement to the Inquiry, NHSGGC said it had been “broadly acknowledged” there was no “definite link between infections and the water system”.
But it said it was “more likely than not” some infections suffered by patients were connected to the hospital’s water supply.
They said: “NHSGGC accepts that, on the balance of probabilities, there is a causal connection between some infections suffered by patients and the hospital environment, in particular the water system.
“It is more likely than not that a material proportion of the additional environmentally relevant BSI [blood stream infections] in the paediatric haemato-oncology population between 2016 and 2018 had a connection to the state of the hospital water system.
“NHSGGC departs from its earlier submissions in this regard, having heard all expert evidence.”
The health board added there had been a “steady decrease” in the rate of infection after remedial measures on the system had commenced.
Asked about the closing statement, a spokesperson for NHSGGC said: “We remain fully committed to supporting the Inquiry in its investigations.”
A Scottish government spokesperson said: “We established a statutory public inquiry so that families could get answers to their questions, and so that lessons can be learned for future hospital projects.
“As an independent core participant of the Inquiry, the Scottish government is committed to assisting the Inquiry and therefore it would be inappropriate to comment any further at this time.”