Thornton-Cleveleys blood tests intensify scrutiny of Hillhouse PFAS investigation

New blood-test results reported on 23 September have increased scrutiny of the long-running investigation into historic PFAS contamination around the Hillhouse Technology Enterprise Zone in Thornton-Cleveleys, Lancashire.

Testing commissioned by solicitors acting for local residents found elevated concentrations of perfluorooctanoic acid (PFOA) in a group of 49 people living near the site. ITV News reported that 69.4% of participants fell within a US-derived category associated with increased health risks, with an average concentration of 26 nanograms per millilitre. The testing was arranged by Leigh Day and undertaken by Manchester Metropolitan University.

The results do not establish that an individual’s exposure came from Hillhouse, nor do they predict whether a particular person will develop illness. However, they add to an active environmental and public-health issue already being examined by Wyre Council, the Environment Agency, UK Health Security Agency, Food Standards Agency and Lancashire County Council.

What has changed

Until now, the public investigation has principally centred on environmental evidence: historic PFOA use and emissions, soil sampling, home-grown produce and potential risks associated with land use close to the site. The latest blood-test findings introduce biomonitoring evidence from residents into that picture.

PFOA was used at the former ICI facility, now operated by AGC Chemicals Europe Ltd, from the 1950s until 2012. Wyre Council says the use was permitted and lawful under the regulatory arrangements that applied at the time. The council’s role is now to decide, under Part 2A of the Environmental Protection Act 1990, whether any land meets the legal test for determination as contaminated land. That assessment is not automatic when a chemical is detected or where a screening level is exceeded.

The Environment Agency’s phased investigation has found PFOA in local soils and in some produce samples. Residents within one kilometre of the site have previously received precautionary advice concerning frequent consumption of substantial quantities of fruit and vegetables grown in gardens or allotments. The current investigation remains live, with further technical interpretation required for some areas.

As of Wyre Council’s March 2026 update on residential soil sampling, no public or private land had been formally determined as contaminated land under Part 2A. That legal position is important: the latest reporting does not itself create a remediation notice, establish liability or determine the future status of land around Hillhouse.

Health evidence needs careful interpretation

PFAS are persistent chemicals, and PFOA is one of the most extensively studied members of the group. Government guidance recognises that exposure to PFOA and PFOS has been linked in studies with effects including changes in cholesterol, birth weight, vaccine response and liver enzymes. The International Agency for Research on Cancer has classified PFOA as carcinogenic to humans.

There is nevertheless an important distinction between population-level evidence and a clinical conclusion for an individual. UK Government guidance states that PFAS blood testing cannot identify the source of exposure, diagnose the cause of existing ill-health or predict future health outcomes. PFAS are widespread in food, consumer products, water, air and the wider environment, so a blood result may reflect multiple sources.

That caveat is reinforced by UKHSA’s rapid review, published on 22 September 2026. It concluded that there is currently inadequate evidence to determine whether long-term exposure from local industrial or manufacturing sites causes adverse health effects in nearby communities, although the review identified a possible association between certain PFAS exposures and lower birthweight. The review also calls for more research.

For the Thornton-Cleveleys community, this means the blood-test findings are significant evidence of exposure that warrants proper consideration alongside the environmental data. They should not, however, be presented as proof of an individual health outcome or of a legally attributable pathway from the site.

Implications for landowners, developers and operators

The immediate issue is local, but the practical lesson is wider for organisations with historic industrial land, nearby development sites, allotments, schools, public open space or residential receptors.

• Revisit conceptual site models. Historic PFAS use, air deposition, shallow soils, gardens, produce-growing areas, surface water and groundwater should be considered together. A conventional desk study that did not identify PFAS as a potential contaminant may need updating where site history supports it.
• Keep screening and legal tests separate. Exceeding an interim screening value may justify further investigation, but it does not by itself mean that land is legally contaminated or that remediation is required.
• Plan sampling around real exposure routes. Sampling strategies should reflect current and reasonably foreseeable land use, including home-grown produce, soil contact, dust and water pathways. Data quality, laboratory method selection and detection limits need to be suitable for the risk assessment question.
• Communicate without overclaiming. Community messaging should set out what is known, what remains uncertain, interim precautions and the decision-making route. Biomonitoring findings require especially clear explanation because they can cause understandable concern but have limited value for individual diagnosis.
• Preserve records and manage change. Operators, landlords and developers should retain historic chemical, emission, waste and permitting records. Proposed earthworks, soil movement, landscaping or changes to growing areas should be assessed against the evolving evidence base.

What happens next

The next material development will be the Environment Agency’s interpretation of the investigation data and Wyre Council’s eventual decision on whether any land satisfies the statutory Part 2A criteria. Until then, organisations should avoid assuming either that the issue is resolved or that formal contaminated-land status is inevitable.

The Government’s PFAS Plan, published in February 2026, signals a broader effort to improve understanding of sources, exposure and environmental movement of PFAS. At Hillhouse, the new resident blood-test results will increase pressure for transparent publication of technical findings, proportionate public-health advice and a clear explanation of any subsequent regulatory decisions.