Cork County Council carried out repairs to over 3,500 leaks last year on behalf of Irish Water.
375 leaks occurred at new metre boxes installed by contractors for the water utility and a further 80 faulty metres had to be replaced.
The figures were released in response to a motion tabled by Councillor Des O’Grady at the February sitting of the authority.
Mr O’Grady said he had requested the information following discussions with council employed plumbers who claimed at least a quarter of installation works were substandard.
The Councillor said he had been provided with photographic evidence of sloppy workmanship.
“In one estate where there were 70 meters installed, 30 needed to be repaired.”
He also claimed substandard pipe work was used in the installation of meters and that lead piping was not being routinely removed, alleging target driven installers were hoping for another pay day from Irish water at a later stage.
Independent Councillor Kieran McCarthy said when it comes to Irish Water “the left hand doesn’t know what the right hand is doing.”
He said he had reported a major leak on the Lake Road, Cobh last week, where up to 30 residents were left three days without water.
The independent Councillor said when he called Irish Water to check the status of the fault, he was told by the agent that there had been no incident logged.
However a day earlier when a resident called they were told the supply would be connected by 8:30pm that evening.
While Fianna Fáil Councillor Frank O‘Flynn said when he tried logging a fault for constituents the operator didn’t know where Kildorrery village was located.
Fine Gael Councillor Kevin Murphy said if the accusations were true then Irish Water should be hauled before council to account for themselves.