Superbug-Creating Genes Found in Lough Neagh, NI Water Risk

Published: 14 March 2026. The English Chronicle Desk. The English Chronicle Online

Genes capable of creating antibiotic-resistant superbugs have been detected in Lough Neagh, the UK’s largest lake, which supplies drinking water to around 40% of Northern Ireland.

Water testing revealed resistance genes spanning multiple classes of antibiotics, from common penicillins to last-resort carbapenems, used when other treatments fail. Quinolones, macrolides, aminoglycosides, cephalosporins, and tetracycline resistance genes—commonly used in livestock—were also present.

“Carbapenems are known as the last-line-of-defence antibiotics,” said Will Gaze, professor of microbiology at the University of Exeter. “If pathogens are resistant to carbapenems, they’re resistant to many others too.”

Markers of human, cow, and pig faeces were also detected, linking the spread of resistance genes to sewage and livestock slurry. These create ideal conditions for superbugs to multiply and enter waterways, posing public health risks. Algal blooms, visible from space, exacerbate the problem by suffocating wildlife and promoting bacterial growth.

Northern Ireland’s Department of Agriculture, Environment and Rural Affairs (Daera) estimates that over 20 million tonnes of untreated sewage spill into waterways each year, with about 30% of storm overflows directly reaching Lough Neagh. Experts warn that actual volumes may be higher due to unmonitored outfalls from wastewater treatment plants.

Even treated sewage carries risk. Davey Jones, professor of environmental science at Bangor University, called sewer networks a “mega-network of an epic breeding ground” for resistant microbes. Funding constraints have limited Northern Ireland Water’s ability to upgrade infrastructure, leaving the public drinking water from a heavily polluted lake.

Livestock farming further contributes to the crisis. Pig, poultry, and cattle numbers have risen sharply since 2013, increasing runoff and the spread of antibiotics and pathogens. Jones emphasized the need for streams to be fenced off and slurry application to be better managed to prevent contamination.

Governance failures compound the problem. The Office for Environmental Protection has criticized Northern Ireland for lacking an independent regulator free from political influence. Until recently, Northern Ireland Water largely avoided prosecution for wastewater breaches, though recent moves aim to improve accountability.

Antimicrobial resistance (AMR) poses a global threat. The WHO warns that drug-resistant infections could claim 39 million lives by 2050 and cost up to $412bn annually. Northern Ireland, with the highest antimicrobial prescribing rates in the UK, faces heightened local risk. Experts urge fast-tracking an independent environmental regulator and better monitoring of AMR in waterways.

Ruth Chambers, senior fellow at Green Alliance, called the situation a “perfect storm” for human health and the environment. Natalie Sims, policy adviser at the Royal Society of Chemistry, warned that without robust environmental data, the UK risks missing a major part of the AMR problem.

Efforts are underway to restore Lough Neagh’s ecological health, including action plans and new monitoring equipment, but experts stress urgent, coordinated action is essential to prevent the spread of superbug genes and safeguard public health.