Environmental NGO Fighting Dirty is challenging the UK's regulatory framework for sewage sludge on two fronts — through the courts and through the politics of post-Brexit chemical classification — as concerns mount that Britain is drifting from EU standards on endocrine-disrupting chemicals (EDCs) and other persistent contaminants.

The Judicial Review

Fighting Dirty initiated judicial review proceedings against the Environment Agency and the Secretary of State for Environment, Food and Rural Affairs, with the High Court granting a hearing to examine the EA's decision to abandon a previously stated commitment to test sewage sludge — applied to agricultural land as fertiliser — for microplastics and PFAS (per- and polyfluoroalkyl substances, commonly called "forever chemicals"). The legal action, confirmed in March 2024, seeks a mandatory testing regime before water companies can sell treated sludge to farmers.

Sewage sludge — the semi-solid residue from wastewater treatment — is a legally permitted soil amendment under UK biosolids regulation. It is also a known vector for PFAS accumulation: PFAS are highly persistent, bioaccumulate through the food chain, and are associated with a range of endocrine and immunological effects. The EA's reversal of its testing pledge is the specific administrative act under scrutiny. Fighting Dirty's position is that the decision was unlawful; the government has not publicly conceded the point.

The Classification Gap

Parallel to the litigation, a quieter regulatory divergence has been widening. Since Brexit, the EU has amended its CLP Regulation (Classification, Labelling and Packaging of substances and mixtures) to introduce dedicated hazard classes for endocrine disruptors — chemicals that interfere with hormonal systems in humans and wildlife. The UK's GB CLP regime, which is based on the UN's Globally Harmonised System (GHS) of chemical classification, has not followed suit, according to analysis published in May 2026 by FIDRA.

The practical consequence is that a substance newly classified as an EDC under EU CLP may carry no equivalent hazard designation in Great Britain, affecting downstream obligations for manufacturers, importers, and downstream users operating under REACH-derived UK legislation.

The UK government laid the draft Chemicals (Health and Safety) (Amendment, Consequential and Transitional Provision) Regulations 2026 before both Houses of Parliament on 24 February 2026 under the draft affirmative procedure, a parliamentary mechanism that requires active approval rather than merely an absence of rejection. The Lords Library noted in April 2026 that a fatal motion was tabled against the instrument — an unusual move in secondary legislation, signalling substantive political resistance to the government's approach.

The Health and Safety Executive has also run a consultation on chemicals legislative reform, canvassing views on which EU hazard classes — including those for EDCs — should be adopted into GB CLP and at what pace. The consultation document outlines a prioritisation framework, but the response report indicates no consensus on how quickly, or whether fully, the UK should mirror Brussels.

Regulatory Divergence, Agronomic Risk

These two threads — the sludge litigation and the classification divergence — converge on a single substantive question: whether the UK's post-Brexit regulatory architecture adequately manages the risk that persistent synthetic chemicals enter agricultural soil through a permitted and commercially significant pathway.

The UK produces several million tonnes of sewage sludge annually, the bulk of which is spread on farmland. If sludge is not systematically tested for PFAS and microplastics prior to land application, contamination loads remain unquantified at the point of application. The EA's abandoned pledge was, by Fighting Dirty's account, an acknowledgment that testing was necessary; its withdrawal is therefore the crux of the legal dispute.

The classification question compounds this. Substances not formally designated as EDCs under GB CLP face weaker regulatory triggers — lower obligations for risk assessment, fewer restrictions on use, reduced labelling requirements. The EU's addition of EDC hazard classes creates a trade-sensitive asymmetry: products compliant under GB rules may not satisfy EU requirements, and vice versa, adding complexity for any UK exporter.

Whether the government revises its approach — on sludge testing mandates or on EDC classification — will depend in part on how the High Court rules, and in part on whether Parliamentary opposition to the draft Chemicals Regulations produces a formal defeat or merely extracted commitments. Neither outcome is imminent.