Capital Investment Plan - Refreshed Position

Uisce Éireann plans and delivers long term investment in water and wastewater infrastructure to support communities, protect the environment and enable sustainable development across Ireland.

This page provides an overview of Uisce Éireann’s Capital Investment Plan for the current regulatory period, outlining how investment is being prioritised and how the information presented should be interpreted.

Supporting housing delivery and sustainable growth

Uisce Éireann is committed to supporting Government policy on housing delivery and sustainable economic growth by targeting investment where it can have the greatest impact. This includes investment to enhance water and wastewater treatment and network capacity, improve environmental compliance, and maximise the efficient use of existing infrastructure, while developing new capacity where required. Investment planning is aligned with national, regional and local planning frameworks.

Uisce Éireann will continue to work closely with the Commission for Regulation of Utilities (CRU), Government Departments, Planning Authorities and other stakeholders as regulatory processes conclude and as investment plans are finalised.

This page sets out Uisce Éireann’s refreshed listing of its Capital Investment Plan (CIP) for Revenue Control Period 4 (RC4), which runs from 2025 to 2029.

About this information

The information published here is intended to support transparency and forward planning for stakeholders, including the general public, local authorities, elected representatives and the development sector. It provides an indicative view of potential investments, subject to regulatory approval, funding and governance.

Regulatory status

While that regulatory process is ongoing, this refreshed information is being published to provide an updated and transparent view of Uisce Éireann’s potential investment pipeline, including the scale and location of additional capacity investment to support housing delivery.

Following the CRU’s final determination of the original RC4 submission, Uisce Éireann intends to engage further with the regulator through a formal reopener process, where appropriate.

Explainer: RC4 and the reopener process

What is RC4?

Revenue Control Period 4 (RC4) is the current regulatory period set by the CRU for Uisce Éireann, covering 2025–2029. It defines the funding, outputs and investment framework within which Uisce Éireann plans and delivers water and wastewater infrastructure.

What is a reopener?

A reopener is a formal regulatory mechanism that allows Uisce Éireann to submit updated or additional investment proposals after the CRU has issued its final determination, where there is a clear policy, funding or evidence basis. Reopeners are typically used to address material changes such as new Government policy priorities, additional Exchequer funding, or emerging investment needs that were not fully defined at the time of the original submission.

Any proposals progressed through a reopener are subject to CRU assessment and approval and do not take effect unless and until that regulatory approval is granted.

Level of detail published (RC4 2025 -2029)

2025 delivery

Projects and Programme Component level completions for 2025 included for completion purposes for the 5 year regulatory cycle. This reflects projects and programme components verified through Uisce Éireann’s internal governance and Outputs & Outcomes (O&O) processes.

2026–2029

Information is presented at a more aggregated level, reflecting the earlier stage of development for these investments and the need to avoid presenting undue certainty before design, sequencing, regulatory and statutory approvals are progressed.

Uisce Éireann will progressively increase the level of detail published as projects advance through governance and delivery stages.

View our Q1 2026 Capital Investment Plan Refreshed Position

What this information means:

It shows how Uisce Éireann intends to align water and wastewater investment with housing growth and environmental priorities.
It provides an indicative view of where additional infrastructure capacity may be required over the RC4 period.
It supports transparency and consistency for stakeholders planning housing and development.

What this information does not mean:

It does not guarantee approval of any specific housing development.
It does not replace the planning or water and wastewater connection application processes.
It does not represent final or fixed project scopes, costs or delivery timelines.

All connection applications continue to be assessed separately on a case by case basis through Uisce Éireann’s standard processes.

Update frequency:

Uisce Éireann intends to update and republish this information on a bi annual basis. Regular updates will provide a clear and stable view of how the investment position is evolving over time, while ensuring that published information reflects appropriate levels of governance, validation and assurance.

Important information and caveats

All projects and programmes referenced are subject to regulatory approval by the CRU, the availability of Government funding, and Uisce Éireann’s internal governance processes.

The RC4 Capital Investment Plan represents a dynamic and indicative portfolio of investments. Project scopes, priorities and delivery timelines may change as projects progress through design, planning, consenting, procurement and construction, or in response to regulatory determinations, funding decisions and emerging policy requirements.

Any such changes will be managed in accordance with Uisce Éireann’s formal governance and change control arrangements.