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Northern Ireland Water

Throughout Northern Ireland there are approximately 795,000 domestic, agricultural, commercial and business properties connected to the public water supply and 660,000 connected to the public sewerage system.

The company supplies 619 million litres of water every day and treats 134 million cubic metres of wastewater each year. The company operates 40 impounding reservoirs, 44 major water treatment works (65 in total), 490 service reservoirs, 287 water pumping stations and 26,500 km of water mains. The company also owns and operates 1,194 wastewater pumping stations, 14,500 km of sewers and 1,124 wastewater treatment works.

Dunore Point Energy Storage Project (2024)

Storing surplus energy from on-site solar panels at one of NI’s largest water treatment plants is a vital step in NI Water’s journey to net zero

Ravenhill Avenue, Belfast, Flood Alleviation Project (2024)

Successful delivery of a £7m project to reduce risk of out-of-sewer flooding, capitalising on the benefits of collaboration through NEC4 Option C Contract

Ards North Long Sea Outfall (2023)

An integral part of NI Water’s £18m Ards North Wastewater Improvement Project to improve the quality of bathing waters in this scenic part of the Ards Peninsula

Ards North Wastewater Improvement Scheme (2023)

The Ards Peninsula is a scenic area in County Down, situated on the north-east coast of Northern Ireland. It separates Strangford Lough from the north channel of the Irish Sea and its coastal towns and villages are popular with day trippers and caravanners alike. By 2020, the wastewater treatment works serving the villages of Carrowdore […]

Ballygowan WwTW (2023)

Ballygowan is a small village situated in County Down, within the Ards & North Down Borough Council area. The towns of Comber and Saintfield are both approximately 4 miles to the north-east, and to the south respectively, with the city of Belfast 7 miles north-west. The 2021 Census indicates that the population of Ballygowan is […]

Derg WTW (2023)

NI Water’s Derg Water Treatment Works (WTW) is located in the north-west of Northern Ireland and produces on average 20 Ml/day, supplying water to approximately 10,000 homes to a wide area including Castlederg, Strabane, Omagh and their associated rural areas. In recent years there have been multiple exceedances of the pesticide, MCPA [(4-Chloro-2-methylphenoxy) acetic acid], […]

Loughries WwTW (2023)

NI Water has undertaken a highly sustainable project which replaces wastewater treatment infrastructure for the catchment of Loughries, a small village close to the shores of Strangford Lough. Due to its age, an increasing load from the village, and ever-tightening discharge limits being applied, the existing works was in danger of breaching consents. The project involved […]

Parkmore Pumping Station & Trunk Main (2023)

Northern Ireland Water’s Cushendall Water Pumping Station (WPS) is housed on the outer perimeter of Dundonnell Water Treatment Works (WTW) situated on the outskirts of Cargan village in the middle of County Antrim. The WPS solely supplies Parkmore Service Reservoir (SR) with potable drinking water, which in turn gravity feeds three other downstream SRs (Knockans, […]

Warrenpoint WwTW (2023)

Warrenpoint is a small town in County Down, situated on the northern shore of Carlingford Lough, approximately 7 miles south-east of Newry. The shared water of Carlingford Lough marks the border between Northern Ireland and Ireland. Due to its scenic beauty and coastal location, Warrenpoint is popular with day trippers and the town can experience […]

Ballykelly WwTW (2022)

Built in the 1970s, Ballykelly WwTW was designed to serve a population of just under 8,000. However, the closure of the nearby army barracks in 2008 meant the population was halved to around 3,600, leaving the works both biologically and hydraulically oversized. A hybrid solution, comprising conventional and natural wastewater treatment processes, was designed for […]

Belfast WwTW (2022)

Situated close to the shores of Belfast Lough, Belfast Wastewater Treatment Works (WwTW) is Northern Ireland’s largest wastewater treatment plant, serving most of the City of Belfast. It occupies a large 45-acre site within Duncrue Industrial Estate and was designed to treat a domestic and trade population equivalent (PE) of 290,000 with discharge into Inner […]

Drumaroad Clear Water Basin (2022)

Drumaroad Water Treatment Works (WTW) supplies water to many households throughout Northern Ireland. A 2013 report commissioned by NI Water identified the need for increased potable water storage facilities within the Drumaroad Supply Zone to reduce the risk of water shortages under certain network situations. As part of a £13m investment to modernise the existing water infrastructure […]

Faughan Raw Water Pumping Station (2022)

Faughan Raw Water Pumping Station (RWPS) is located adjacent to the River Faughan and abstracts water from the river. It provides screening by means of bar and band screens before pumping the water via a 30 inch steel raw water pumping main to Carmoney Water Treatment Works (WTW). Carmoney WTW has a minimum daily output […]

Northern Resilience Phase 3 (2022)

There is currently limited ability within the existing Northern Resource Zone to transfer water between WTW demand zones during onerous operating conditions or during a major incident at any one of the WTWs. At Carmoney WTW recent flooding at the River Faughan disabled the abstraction plant and raised the pollution risks associated with the nearby […]

Ravenhill Avenue, Belfast, Flood Alleviation Project (2022)

Ravenhill Avenue is located in south Belfast, close to the city centre. It is a densely populated residential area which has seen recent development of historically industrial sites. The sewer infrastructure in Ravenhill Avenue dates back to the early 20th century, and is therefore in poor condition and undersized to deal with today’s flows. Unfortunately, […]

Clabby WwTW (2021)

Clabby is a rural village located approximately 5km from Fivemiletown on the border between Counties Tyrone and Fermanagh. The existing wastewater treatment works was constructed in 2002 on the outskirts of the village with a design PE of 271 for a Water Order Consent (WOC) of 23:30 (BOD:SS). With a current PE of 450, the […]

SWELL - Donemana WwTW (2021)

Donemana Wastewater Treatment Works (WwTW), located on the banks of the Burn Dennet River and at the foothills of the Sperrins in Co. Tyrone, serves the Donemana area – the largest of the thirteen villages in the Derry City and Strabane Council area. The existing works had been in service for almost 50 years with […]

Maryville Avenue, Belfast, Flood Alleviation Project (2021)

Customers’ residential properties on Maryville Avenue, South Belfast, had experienced out-of-sewer flooding during periods of heavy rainfall due to the poor condition of the sewerage infrastructure and the partial collapse of a 375mm diameter combined sewer. This sewer is located within 5m of the Belfast to Dublin high-speed rail line and in close proximity to […]

SWELL - Newpoint Terminal WwPS (2021)

Newry is situated some 35 miles south-west of Belfast at the northernmost end of Carlingford Lough, where the Clanrye River/Newry Estuary enters the sea. Newpoint Wastewater Pumping Station (WwPS), situated off the Warrenpoint Road, is the terminal pumping station for the city. The WwPS receives incoming flows from the greater Newry and Carlingford area at […]

SWELL - Shared Waters Enhancement & Loughs Legacy Project (2021)

The Shared Waters Enhancement & Loughs Legacy (SWELL) project is an extensive programme of work being led by NI Water working in partnership with Irish Water, the Agri-Food & Biosciences Institute (AFBI), Loughs Agency and East Border Region. Funded under the EU’s INTERREG VA Programme, managed by the Special EU Programmes Body, the €35m project […]

SWELL - Strabane WwTW (2021)

The Shared Waters Enhancement & Loughs Legacy (SWELL) project, funded by the EU INTERREG VA Programme, considered wastewater assets with the greatest potential to improve water quality within the Carlingford Lough and Lough Foyle drainage catchments. This included for a major upgrade to the inlet works at Strabane WwTW. In recent times, excessive flows arriving […]

Toome Road, Ballymena, Flood Alleviation Project (2021)

Over a number of years, properties in the Toome Road area of Ballymena, County Antrim (Northern Ireland), have experienced both external and internal flooding. The residents had been living in fear of further flooding every time there was significant rainfall and the flooding history also meant they had difficulties and extra expense in getting insurance […]

SWELL - Warrenpoint WwTW (2021)

Warrenpoint is a small town in County Down, situated on the northern shore of Carlingford Lough, approximately 7 miles south-east of Newry. The shared water of Carlingford Lough marks the border between Northern Ireland and Ireland. Due to its scenic beauty and coastal location, Warrenpoint is popular with day trippers and the town can experience […]

Lough Fea Clear Water Basin South (2020)

Lough Fea Water Treatment Works supplies water to approximately 24,000 Northern Ireland Water customers, with the Lough Fea Clear Water Basin South supplying over 10,000 people in Cookstown and surrounding rural areas. A 2013 report commissioned by NI Water identified the need for increased potable water storage facilities within the Lough Fea Supply Zone to […]

Maghaberry WwTW (2020)

Maghaberry Wastewater Treatment Works (WwTW) serves the Maghaberry area and the local prison in the Lisburn and Castlereagh District Council area, in Co. Antrim, Northern Ireland. The Works is under the control of NI Water and provides primary and secondary treatment. The Works was insufficiently sized to suit the growing local population and the expansion […]

Portaferry Road Newtownards Wastewater Pumping Station (2020)

Located on the edge of Strangford Lough, on the Ards Peninsula, Portaferry Road WwPS serves the eastern catchment of Newtownards, forwarding approximately 25-35% of the wastewater from Newtownards town to Ballyrickard WwTW, located approximately 3km away. Altogether Ballyrickard WwTW receives untreated foul effluent from six major pumping stations located within the Comber and Newtownards catchments: […]

Rathlin Island Borehole Project - Ion Exchange Plant (2020)

In summer 2019, Northern Ireland Water commenced upgrade works to the water supply on Rathlin Island, Northern Ireland’s only inhabited offshore island. The current public water supply on Rathlin Island is supplied from groundwater. It consists of a pair of closely located boreholes feeding a simple double cartridge type filtration system with sodium hypochlorite dosing […]

Smart Flushing (2020)

As with all water companies, Northern Ireland Water (NI Water) work within the targets and guidelines set by their industry regulator, the Northern Ireland Utility Regulator and the Drinking Water Inspectorate (DWI). At present Northern Ireland’s existing potable water main infrastructure comprises approximately 26,700 km of water mains, delivering approximately 560 million litres of clean, […]

Ormeau Avenue Sewerage Upgrade (2019)

An article published in the 22 April 1881 edition of the ‘News Letter’, one of Belfast’s leading newspapers, still in circulation today, remarked: “Time was when the Blackstaff [River] ran through the suburbs little more polluted than a mountain burn. Now it has become the greatest eyesore in the town.” This self-same article also published […]

Queens Bridge Siphons (2019)

During 2018, NI Water commenced refurbishment work to one of its critical assets, twin sewerage siphons, known as the Queens Bridge Siphons, in Belfast. The siphons transfer wastewater from a substantial proportion (circa 40,000 population) of the east of the City under the River Lagan to the Oxford Street Trunk Sewer for onward transfer to […]

Ballycastle Wastewater Project (2018)

The picturesque coastal town of Ballycastle is located on Northern Ireland’s scenic North Antrim Coast. This popular tourist spot attracts many visitors, who come to take in the beautiful scenery, as well as passing through on their trip along the famous Wild Atlantic Way. Visitors come from all over the world to see the nearby […]

Galgorm Wastewater Pumping Station Upgrade (2018)

Galgorm Wastewater Pumping Station (WwPS) is located within a busy public car park in the centre of Galgorm village, approximately 3.5km to the west of Ballymena, Co. Antrim. The WwPS is accessed via a steep laneway off the A42, Fenaghy Road, adjacent to Galgorm roundabout. Galgorm WwPS passes forward flows to Tulllygarley Wastewater Treatment Works […]

Olympia Leisure Centre and Windsor Park Storm Sewer Project (2017)

The existing combined sewerage system in the area did not have the capacity to take the increase in flow from these two major developments; therefore a new storm sewer was required. The project has also given NI Water the opportunity to update the 1930s combined drainage system in the area by the removal of significant […]

Ballydougan to Newry Strategic Trunk Mains Ph2b (2016)

The Ballydougan to Newry Strategic Trunk Mains Project is the culmination of 10 years work and a £20m investment by NI Water to provide a strategic water main between Ballydougan Command Reservoir, supplied from Castor Bay WTW, and the Newry area. NI Water’s Water Resource Strategy identified the need for a number of strategic links […]

Ballynacor Sewage Lagoon Project (2016)

Project Omega is a 25 year Public Private Partnership contract issued by Northern Ireland Water (NI Water) to upgrade, operate and maintain existing wastewater treatment works (WwTW) and wastewater pumping stations (WwPS) at a number of locations across Northern Ireland, equivalent to approximately 25% of the province’s wastewater treatment capacity. The contract also provides a […]

Carland to Cookstown Strategic Link Main (2016)

Northern Ireland Water (NI Water) is committed to improving the water supply infrastructure across Northern Ireland to provide a robust and reliable network. Their Water Resource Management Plan (WRMP) 2012 details how the company proposes to manage its water resources into the long-term future. The WRMP looks 25 years ahead and states how the company […]

Trunk Main Risk & Consequence Modelling Project (2016)

Northern Ireland Water (NI Water) has responsibility for providing potable water to almost 1.8 million people across Northern Ireland via some 27,500km of watermains. The company currently operates almost 2,300km of trunk and strategic watermains which represent 8.3% of its potable water network (trunk mains are defined as those with a 300mm nominal diameter and […]

Water Mains Rehabilitation (NI Water) (2016)

The existing water mains infrastructure in Northern Ireland consists of 26,500km of pipes supplying 625 million litres of water per day to 1.8 million consumers in households, farms and businesses. While consumers are served well by the existing infrastructure, many parts of the network are well over 40 years old. Lack of investment over the […]

Annagher Wastewater Pumping Station (2015)

Upgrade to reduce spills to Coalisland Canal, providing flood protection to the Coalisland catchment and rejuvenating the Coalisland community

Castor Bay to Belfast Strategic Trunk Main Scheme (2015)

A vital new source of water to meet peak period demands in Lisburn and Belfast and help the existing network cope with any future emergency situations

Gravity II Pipeline (2015)

£5m refurbishment project to an existing 33” precast concrete main in north Belfast, which was previously de-commissioned in the early 1980s

Holywood Sewer Network Improvements Project (2015)

Improvements project delivering environmental benefits for the Holywood & Kinnegar areas of North Down and Belfast Lough coastal waters

Stoneyford Integrated Constructed Wetland (2015)

NI Water’s innovative new pilot wetland solution

Bangor Sewerage Improvement Scheme (2014)

£10m sewerage improvement programme delivering benefits to North Down coastal bathing waters

Drumbeg Drive Wastewater Pumping Station (2014)

A complex project to protect the quality and appearance of the River Lagan, one of Lisburn City’s greatest natural assets

Londonderry Drainage Area Plan Implementation (2014)

£35m upgrade to sewerage network infrastructure on the banks of the River Foyle within the 2013 UK City of Culture

Newry Road Wastewater Pumping Station (2014)

Reducing spills to Carlingford Lough and protecting low lying areas of the local catchment from flooding

River Strule Abstraction Project (2014)

Challenges faced on the £6m investment to augment the raw water supply to Derg WTW

Wastewater Pumping Stations Upgrade Project (2014)

Northern Ireland Water’s efficient procurement delivers widespread environmental benefits

Benone Area Sewerage Scheme (2013)

Complex wastewater treatment upgrade project to protect the quality of bathing water

Newcastle WwTW (2013)

An £8m NI Water investment to meet future bathing water standards

Water Mains Rehabilitation (NI Water) (2013)

£80m investment to upgrade over 1,000km of water mains across Northern Ireland

Castor Bay to Dungannon Strategic Trunk Mains (2012)

£20.3 million investment to improve the water infrastructure in South Tyrone

Clay Lake WTW (2012)

Climate change points to high turbidity, organic carbon levels and algal loads

Dunmurry WwTW (2012)

£5.5m upgrade to an outdated works to meet nitrogen and phosphorous consent conditions

Keady WwTW (2012)

£5m Investment to construct one of the largest RBC sites in Europe

Maghera & Dungiven WwTWs (2012)

Using large diameter rotating biological contactors (RBCs) to achieve challenging treated effluent standards

Whitehead, Ballcarry & Ballystruder Rationalisation (2012)

£7m investment for the Islandmagee Peninsula

Castlecaulfield WwTW (2011)

New RBC plant in County Tyrone with a 2030 design horizon

Magherafelt WwTW (2011)

Sustainable design and construction to deliver effective, low carbon wastewater treatment

Moneymore & Coagh WwTW (2011)

Re-use and upgrade of existing assets for a 2017 interim design horizon

Newtownbreda WwTW (2011)

£5m upgrade to an outdated WwTW to meet nitrogen and phosphorus consent conditions

Rural Wastewater Improvement Programme (2011)

Efficient procurement to deliver widespread environmental benefits for rural communities

Toome & Creagh WwTW Scheme (2011)

Effective combined treatment solution delivered by NI Water

Antrim WwTW (2010)

£23.5m investment delivers effective wastewater treatment for the Antrim catchment

Belfast Sewers Project (2010)

£160m project provides modern sewerage system for Belfast

Bushmills WwTW (2010)

£7m wastewater upgrade project on schedule to deliver higher quality bathing water in popular tourist region

Derrylin WwTW (2010)

Fixed film technology provides a high standard wastewater treatment

Enniskillen WwTW (2010)

£13.5m investment with a 2030 design horizon

Hamiltonsbawn WwTW (2010)

New Inclined Bubble Aeration process with a 2030 design horizon

Lough Bradan & Carmoney WTW (2010)

Additional treatment capacity and process improvements

Glenstall & Ballymoney WwTW (2009)

New works to serve Ballymoney and the outlying villages

Project Alpha - Design & Build (2009)

UK’s first ever PPP for the bulk supply of potable water serving almost 50% of Northern Ireland’s population

Rural Wastewater Investment Programme (2009)

£10m wastewater programme delivering environmental benefits across rural Northern Ireland

Seagahan WTW (2009)

New plant constructed within existing slow sand filter

Belfast WwTW - Incinerator - Project Omega (2008)

Project Omega sludge disposal solution – second stream sludge incinerator at Duncrue Street WwTW

Cookstown WwTW (2008)

£14m treatment plant breathes new life into local river

North Coast Wastewater Treatment Scheme (2008)

Extensive sewerage upgrade improves NI bathing waters

North Down Strategic Trunk Main (2008)

N Ireland’s £16m North Down Trunk Mains Project

Water Mains Rehabilitation (NI Water) (2008)

£80m investment to upgrade over 800kms of varied water mains

Belfast Sewers (2007)

Providing modern sewerage system for city

Claudy & Sion Mills WwTW (2007)

Two new Northern Ireland wastewater treatment works

Dunore to Hydepark Trunk Main (2007)

Major new pipeline commissioned early in Northern Ireland

North Down & Ards WwTW - Project Omega (2007)

First time WwTW for north of Ards Peninsula

Project Alpha - Planning (2007)

Northern Ireland upgrades 50% of water treatment capacity

Belfast WwTW - Scrubber Plant (2006)

New scrubber effluent treatment plant

Carran Hill WTW (2006)

New £10m WTW for Crossmaglen & district

Carrickfergus & Whitehouse WwTWs (2006)

Belfast North Shore Project

Fofanny WTW (2006)

One of the most unique water treatment works ever built

North Coast Wastewater Treatment Scheme (2006)

Most complex wastewater & bathing waters scheme in N Ireland

North Down & Ards WwTW - Site Selection (2006)

A review of site selection and methodology

Ballyclare WwTW (2005)

£9.5M scheme for Northern Ireland

Culmore WwTW (2005)

Upgrade to meet treatment & new discharge regulations

Larne WwTW (2005)

Compliance with EU bathing & urban water directives

Portglenone WwTW (2005)

DRD Water Service – Portglenone WwTW improvements

Ballynacor WwTW - Sludge Reclying Centre (2004)

Network control system critical to plant’s continuous operation

Fofanny WTW (2004)

Sympathetic design and construction in sensitive environment

Ballymena WwTW (2003)

£10m Northern Ireland scheme extends existing facilities

Ballynacor WwTW - Sludge Reclying Centre (2003)

New regional sludge recycling centre

Banbridge WwTW (2003)

New plant doubles capacity on existing restricted site

Lough Macrory WTW (2003)

State-of-the art automation for new NI WTW

Mourne Aquarius 3 (2003)

£20m 3rd phase of major Northern Ireland project

Water Resource Strategy 2002-2030 (2003)

Ensuring high quality water for this & future generations

Dunore Point WTW (2002)

Extensive improvements including two-stage ozonation

Newry WwTW (2002)

Upgrade using new treatment process