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UK utilities to expand wastewater epidemiology for pandemic surveillance


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The UK is moving to embed wastewater pathogen surveillance as a standing element of national biosecurity.


It will expand wastewater epidemiology beyond Covid-era emergency use into a broader system designed to detect emerging infectious threats early.


The UK Health Security Agency (UKHSA) is now developing methods to track 11 high-risk pathogens in sewage at treatment works across England, including Crimean- Congo haemorrhagic fever, Lassa fever and hypervirulent Klebsiella pneumoniae.


This transition has implications for sample design, analytical sensitivity, data integration and the future role of near-source monitoring.


From Covid response to routine surveillance


Wastewater surveillance rose to prominence during the Covid-19 pandemic, when it proved capable of tracking infection levels and viral variants at the community scale by detecting fragments of SARS-CoV-2 genetic material excreted into sewer systems.


At its peak, UKHSA was processing around 2,000 wastewater samples per week, drawn not only from treatment works but also from manholes and targeted locations.


After mass Covid testing wound down in 2022, routine wastewater monitoring in England narrowed largely to polio.


Vaccine-derived poliovirus detections at several sewage plants triggered local public health interventions, reinforcing the method’s value as an early-warning system even in the absence of reported clinical cases.


The new expansion builds directly on that experience.


Funded under the UK’s biological security strategy, it extends the existing polio surveillance network of 28 sampling sites into a broader research and development programme targeting pathogens judged by UKHSA to pose the greatest public health risk.


What is being monitored – and how


The 11 pathogens selected span viruses, bacteria and fungi, reflecting concern not only about acute outbreaks but also about antimicrobial resistance and hospital- associated infections.


Detection relies on identifying small quantities of pathogen DNA or RNA in complex wastewater samples, often at concentrations far below those encountered in clinical diagnostics.


To support this, UKHSA and academic partners are investing in high-throughput gene sequencing, including portable platforms from Oxford Nanopore.


These instruments allow rapid characterisation of genetic material and, crucially, the identification of variants that may alter transmissibility or severity.


At the same time, artificial intelligence is becoming central to data processing. UKHSA is already applying machine learning techniques to genomic analysis, aiming to extract actionable signals from large volumes of noisy environmental data.


Similar approaches are being trialled internationally, with AI-driven systems demonstrating the ability to identify multiple pathogens and variants using relatively small numbers of samples.


Beyond treatment works: the case for near-source monitoring


While national surveillance has so far focused on municipal-scale sewage treatment plants, researchers increasingly argue that this is only part of the picture.


The University of Bath’s Centre for Excellence in Water-Based Early Warning Systems for Health Protection is testing wastewater not only for priority pathogens but also for antibiotics and antimicrobial resistance genes in both sewage and rivers.


According to Bath researchers, the UK does not yet have a fully fledged national wastewater surveillance network, but the foundations are


in place.


They also stress that finer-grained monitoring may be essential.


Sampling at individual buildings or facilities, like hospitals, care homes, prisons or airports, can reveal localised trends that national systems may miss.


This has been demonstrated in recent studies where daily wastewater monitoring at individual premises correlated closely with staff sickness, infection events and changes in cleaning regimes.


Such near-source surveillance opens up a different operational model, one that prioritises rapid local response over aggregated national indicators.


For the environmental monitoring sector, this points toward growing demand for flexible sampling systems, decentralised analytical capability and robust data pipelines capable of supporting both local decision-making and national oversight.


International momentum and early-warning potential


The UK’s expansion is part of a broader global shift.


The EU launched a Global Consortium for Wastewater and Environmental Surveillance for Public Health last year, and local projects in the US, Australia and Asia are demonstrating how wastewater signals can precede clinical reporting by days or even weeks.


In Texas, wastewater monitoring detected measles virus in Houston sewage samples ten days before the first local cases were officially reported, despite almost three years of prior negative results.


Researchers concluded that the detections likely originated from just two infected individuals, underlining the sensitivity of modern methods.


These examples highlight wastewater’s value as an upstream signal, one that can operate independently of healthcare access, testing behaviour or reporting delays.


Confidence and false alarms


As pathogen panels expand and analytical sensitivity improves, a new challenge comes into focus: how to respond when surveillance detects something genuinely new.


Researchers involved in the UK programme acknowledge that the detection of an unknown “Disease X” would raise difficult questions about confidence, verification and communication.


From a monitoring perspective, this places a premium on data quality, reproducibility and cross-validation between sites and methods.


False positives, or poorly contextualised signals, could carry real social and economic consequences.


Wastewater as long-term monitoring infrastructure


What is now emerging is a reframing of wastewater systems themselves.


No longer viewed solely as sanitation infrastructure, sewers are becoming continuous sampling networks for population- scale health and environmental intelligence.


For environmental monitoring professionals, this shift brings wastewater surveillance firmly into the same strategic category as air quality networks, river monitoring and emissions reporting: long- term, policy-relevant infrastructure rather than temporary project work.


As costs fall, analytical tools mature and AI-driven interpretation becomes routine, wastewater monitoring is likely to move from innovation to expectation.


The question is no longer whether it works, but how comprehensively, and how responsibly, it will be deployed.


Business News UKHSA launches wastewater surveillance programme to strengthen pandemic preparedness


The UK Health Security Agency (UKHSA) has launched a programme to assess how wastewater surveillance could be used to detect a broader range of high-risk pathogens. UKHSA laboratories have begun to evaluate technologies designed to identify viral genetic material in wastewater, supported by investment of £1.3 million from the UK Integrated Security Fund (ISF).


The initiative aims to improve the UK’s capacity to track how the presence of pathogens changes over time and to act more rapidly in response to potential threats. The programme


builds on the country’s existing wastewater monitoring system for the poliovirus. If successful, it could extend to include diseases not previously targeted by such testing, such as Crimean Congo haemorrhagic fever – a severe condition that is endemic in Africa, the Balkans, the Middle East and parts of Asia.


“Our first responsibility was to keep people safe, and the Biological Security Strategy and our new Resilience Action Plan set out how health security was an essential part of our national security. “This novel wastewater monitoring project had the potential to be a valuable tool in


our armoury, helping us prepare for and rapidly detect future outbreaks as we learnt lessons from the pandemic,” said Pat McFadden MP, Chancellor of the Duchy of Lancaster.


The project has also sought to test whether the same methods could provide early warning of other infectious threats, including Mpox, West Nile virus and Lassa fever. “Wastewater monitoring had the potential to be central to our work on pathogens that threatened public health. It showed great promise as a cost- effective way to detect a range of emerging pathogens quickly, which was vital for an


effective response.


“This was an exciting and important project. The diversity of biological threats was increasing globally, and it was crucial that we stayed at the cutting edge of novel technology to detect them,” Professor Steven Riley, UKHSA Chief Data Officer. The wastewater surveillance programme forms part of the ISF’s Biosecurity Portfolio launched earlier this year by the government’s Cabinet Office to strengthen the UK’s national resilience against biological threats.


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