Several local authorities have warned Irish Water that it may not be paying them enough to maintain existing services, such as producing drinking water and fixing leaks.
Irish Water has signed contracts or service level agreements with all 34 local authorities.
RTÉ News has obtained the agreements, which show serious concerns over resources.
Dublin City Council, the biggest provider of water in the State, said "Irish Water have yet to confirm that adequate budget will be provided".
It warned that "targets may not be met and day-to-day operations may be neglected".
It said it may not have enough staff for its water treatment section, which provides drinking water to the capital.
It loses just under 37% of that water supply to leaks.
For 2014, the council aims only to keep the leaks at that level and warns even that might be difficult to achieve
Dún Laoghaire-Rathdown County Council stated that "it is inevitable that levels of service delivery will fall if adequate resources are not made available".
It warns of staffing shortages in the sections that find and fix leaks.
Kerry County Council warned of "insufficient funds in the 2014 budget leaving a funding shortfall to deliver the services".
Many of the sewage schemes in the county are overloaded.
Galway and Mayo county councils both warned of risks of “insufficient budget, further depletion of resources and escalating network deterioration".
Meath and Kildare county councils argue that the very existence of Irish Water creates extra demands, which they will need additional resources to meet.