The pipeline is set to benefit Offaly and Westmeath.
There have been around 150 requests from landowners to alter the route of the new Water Supply Project from Uisce Éireann.
The utility says the midlands and eastern regions are too dependent on the water supply from the River Liffey, with the new project to see a pipeline from the River Shannon to a reservoir in Peamount, Dublin.
Additional pipelines along the development's 'spine' would service Offaly, Westmeath and North Tipperary.
Uisce Éireann says the project has undergone many alterations since last October, and they are expecting a decision imminently.
Asset Strategy Senior Manager at Uisce Éireann, Angela Ryan says they've been engaging with around 500 landowners:
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