On 11th March 2026, World Plumbing Day will once again draw attention to the fundamental part plumbing plays in safeguarding public health and safety. This year’s theme, ‘Worldwide Problems, Global Solutions’ emphasises the important conversations around the wider impact of plumbing beyond pipes and fixtures.
NI Water and the Northern Ireland Environment Agency (NIEA) are taking this opportunity to offer guidance on the correct way to connect drains and the dangers posed by misconnections.
Investigations carried out by NIEA have revealed that many properties have plumbing connected incorrectly. In these cases, domestic pipes from toilets, showers and washing machines are mistakenly routed to surface water drains rather than wastewater sewers. NI Water and NIEA warn that such errors can lead to pollution in nearby streams, rivers and beaches, harm wildlife, and threaten public health.
Angela Halpenny, Head of Environmental Regulation at NI Water, explains the significance of identifying and rectifying misconnections, and points out that plumbing is often linked to the wrong sewer unintentionally.
Angela said: “For homes constructed after 1970, there is usually a separate system: wastewater enters the sewer, whilst rainwater is directed to surface water drains and onward to local rivers or beaches.
“Problems arise when wastewater pipes are mistakenly connected to surface water drains, resulting in untreated sewage being discharged directly into rivers and, potentially, onto beaches. Misconnections can occur when installing new appliances, during property extensions or renovations, or even at the initial building stage. Likewise, incorrectly connected gutters and gullies can send clean rainwater into wastewater pipes, leading to flooding and polluting waterways with untreated waste.
“We are urging the public to regularly check their plumbing for any misconnections. It is the duty of property owners to maintain and repair their wastewater systems and pipework, both within their homes and up to the point where they join the public sewer. Neglecting this responsibility can result in pollution.”
NI Water, in collaboration with NIEA, is actively working to identify and resolve misconnections throughout Northern Ireland.
Kevin McGrady, an Emergency Pollution Officer with DAERA NIEA, notes that many domestic and commercial property owners may not realise whether their premises are properly linked to the sewerage system.
Kevin said: “Wastewater routed incorrectly can carry pollutants such as untreated sewage and nutrients like phosphorus and nitrogen. When discharged into storm sewers, this can significantly degrade the water quality of rivers, lakes and coastal areas, including Lough Neagh. Such pollution also affects bathing and shellfish waters, potentially impacting tourism and the local economy.
“When NIEA identifies environmental impacts caused by misconnections, these incidents are officially recorded as water pollution events. NIEA then alerts NI Water so they can prioritise repairs. Incorrect plumbing in homes and businesses may result in wastewater being discharged directly into local waterways, so it is vital to check both indoor and outdoor connections to prevent pollution.”
Further guidance can be found at the web links below. If you notice any water pollution in Northern Ireland, please report it to the NIEA Incident Hotline on 0800 807060, or for less urgent issues, email emergency-pollution@daera-ni.gov.uk
Where to find further information about what to do:
- NI Direct offers comprehensive advice on how to make sure your home is connected to the right drains: www.nidirect.gov.uk/articles/connecting-your-home-right-drains
- www.nidirect.gov.uk/sites/default/files/2021-11/drainage-misconnections-leaflet.pdf
- Water UK offers a comprehensive guide on how to check for a misconnection and how to deal with it in case one is found: www.water.org.uk/developers/plumbing-and-drainage-misconnections
- If you need to contact someone to repair a misconnection, always choose a WaterSafe plumber as they are properly qualified and registered to deliver the high quality plumbing work that ensures safe public water supply and give homeowners assurance of an approved scheme and recourse if things happen to go wrong: www.watersafe.org.uk
- To report a misconnection phone NI Water’s Waterline on waterline@niwater.com
- Water Pollution can be reported to the NIEA Incident Hotline on 0800 80 70 60 or, for less urgent matters, via email to emergency-pollution@daera-ni.gov.uk
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Media enquiries to the NI Water Press Office via email to press.office@niwater.com
