Mutton Island Sewerage Treatment Plant

Midwest Formwork (UK) Ltd have an extensive portfolio of recently worked upon projects.

Project Overview

The scope involved the construction of a Wastewater Treatment Plant and Sea Outfall on Mutton Island approximately 1 km off the Coast of Galway City.

The contract period was two years with initial construction involving a Sea Wall and Rock Armoured Revetment to allow work on the treatment plant to proceed unimpeded by the tidal conditions of the area.

The 400 meter long 900 millimeter diameter treated effluent outfall and diffuser, was constructed in the second year of construction, and was placed into a pre-excavated rock trench below the sea bed.

Mr Pat the Cope Gallagher Minister of State at the Department of the Environment, Heritage and Local Government, today (6/5/04) officially opened Galway City's Mutton Island Wastewater Treatment Plant. At a cost of €70m the plant is the largest element of the €112m Galway Main Drainage Scheme which has put a modern wastewater collection and treatment system in place for the city and environs, including Oranmore.

Completion of the Mutton Island plant, close to Salthill, ends the daily discharge of millions of gallons of raw sewage into Galway Bay and adds Galway to the growing list of Irish cities and towns that now comply with the stringent standards of the EU Urban Waste Water Treatment Directive. The cessation of sewage pollution from the city will also mean permanent restoration of Blue Flag standards for bathers in Salthill.

Main Contractor

Scon Ltd

Contract Value


Time Scale

13 Months




PH McCarthy and Partners

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