Water

Aus der Beek and colleagues compiled data from 1,016 publications and found 631 distinct pharmaceutical compounds detected in surface water, groundwater, or drinking water across 71 countries. The most frequently detected classes were analgesics, antibiotics, antidepressants and hormones. Conventional sewage treatment removes only 50 to 80% of most pharmaceuticals, with some compounds passing through virtually unchanged.

In UK rivers, fluoxetine (Prozac) has been detected at concentrations sufficient to alter fish behaviour, reducing predator avoidance and foraging activity. Carbamazepine (an anticonvulsant) is one of the most persistent compounds, detected in treated drinking water at nanogram-per-litre concentrations. The cumulative effect of chronic low-dose exposure to dozens of pharmaceutical residues simultaneously has not been studied in any population.

When chlorine reacts with organic matter in water, it produces trihalomethanes and other disinfection byproducts. Villanueva and colleagues analysed 6,241 bladder cancer cases across six European countries and found long-term exposure to trihalomethane levels above 50 micrograms per litre was associated with approximately 1.2 times the bladder cancer risk. Roughly 5% of European bladder cancers were attributable to THM exposure.

UK tap water THM levels are regulated below 100 micrograms per litre, but some areas regularly approach this limit, particularly those drawing from surface water with high organic content. Richardson identified over 600 disinfection byproducts, fewer than 100 of which have been toxicologically characterised. Chlorination prevents waterborne disease, but the long-term consequences of chronic low-dose byproduct exposure are only partially understood.

An estimated 25 to 40% of UK homes, predominantly those built before 1970, are still served by lead pipes connecting the water main to the property. The Drinking Water Inspectorate reported 1.1% of UK samples exceeded the current 10 micrograms per litre limit in 2022, but Lanphear and colleagues demonstrated no safe threshold for lead exposure in children, with each 1 microgram per decilitre increase in blood lead associated with measurable IQ reduction.

The UK reduced the regulatory limit from 50 to 25 to 10 micrograms per litre over successive decades, but has not mandated pipe replacement. Phosphate dosing reduces lead dissolution but does not eliminate it. Flushing the tap before drinking reduces but does not remove lead from first-draw water. An estimated 1.5 million children in England live in homes with lead service connections.

Per- and polyfluoroalkyl substances are a family of over 14,000 synthetic fluorinated compounds that do not break down in the environment or the body. CDC NHANES data showed detectable PFAS in the blood of 98% of the American population. Cousins and colleagues published in Science in 2022 that PFAS contamination of rainwater now exceeds safety guidelines on every continent, including Antarctica.

In England, the Environment Agency has identified PFAS contamination at multiple sites, with concentrations exceeding the EU drinking water directive limit of 100 nanograms per litre. PFOA and PFOS, two of the most studied compounds, are associated with immunotoxicity at the lowest observed effect levels, thyroid disruption, liver damage and increased cholesterol. Half-lives in the human body range from 2 to 8 years, meaning exposure accumulates across a lifetime.

Thames Water serves 16 million customers, roughly 25% of England's population.

Its net debt reached £17.6 billion by December 2025.

Moody's rates it Caa3, below investment grade.

The company was privatised debt free in 1989.

The debt accumulated during Macquarie Group's ownership between 2006 and 2017, a period of heavy dividend extraction.

In February 2025, the High Court approved a controversial £3 billion restructuring loan at 9.75% interest from hedge funds including Elliott Management.

KKR was selected as preferred equity bidder in March 2025 but withdrew in June 2025.

Ofwat fined Thames £122.7 million in May 2025.

As of late 2025, a creditor consortium offered a £5.4 billion rescue package with a 25% write-down on existing liabilities.

Special administration remains a live possibility.

Kosuth and colleagues tested 159 tap water samples from 14 countries and found microplastic fibres in 81% of samples, with an average of 4.34 particles per litre. Bottled water fared worse: Mason found an average of 10.4 particles per litre across 259 bottles from 11 brands, with some containing over 10,000 particles per litre. Particles included polypropylene, nylon and polyethylene terephthalate.

Microplastics smaller than 10 micrometres can cross the intestinal epithelium and enter the bloodstream. Leslie and colleagues confirmed microplastic presence in 77% of human blood samples tested in the Netherlands. These particles carry adsorbed persistent organic pollutants and leach plasticisers including phthalates and bisphenol A. Standard UK water treatment does not filter particles below 50 micrometres. The exposure is continuous and cumulative.

The UK has no statutory, legally binding standards for PFAS in drinking water.

The Drinking Water Inspectorate operates guidance based thresholds of 100 nanograms per litre for any individual PFAS compound.

A new cumulative limit of 100 nanograms per litre for the sum of 48 named PFAS compounds took effect from January 2025.

The US EPA set legally enforceable Maximum Contaminant Levels of 4 nanograms per litre for PFOS and PFOA individually in April 2024.

The UK threshold is 25 times higher than the American standard.

DWI monitoring in 2024 found 96% of samples below detection limits and no Tier 3 detections in treated water.

However, 351 raw water samples were at Tier 3 levels.

35 to 37% of water courses tested by the Royal Society of Chemistry contained medium to high risk PFAS levels.

The UK has no statutory, legally binding standards for PFAS in drinking water.

The Drinking Water Inspectorate operates guidance based thresholds of 100 nanograms per litre for any individual PFAS compound.

The US EPA set legally enforceable limits of 4 nanograms per litre for PFOS and PFOA in April 2024.

The UK threshold is 25 times higher than the American standard.

Thames Water serves 16 million customers, roughly 25% of England's population and carries £17.6 billion in debt.

The company was privatised debt free in 1989. The debt accumulated during Macquarie Group's ownership between 2006 and 2017, a period of heavy dividend extraction.

Across the sector, English water companies have paid an estimated £65 to £85 billion in dividends since privatisation.

Only 4 of 16 companies met their 2024/25 leakage performance commitments. The sector still loses approximately twenty percent of treated water.

English water companies have paid an estimated £65 to £85 billion in dividends since privatisation in 1989.

The range reflects different methodological approaches to calculating total shareholder returns.

Only 4 of 16 companies met their 2024/25 leakage performance commitments.

The sector still loses approximately twenty percent of treated water to leakage.

The Water (Special Measures) Act 2025 received Royal Assent on 24 February 2025.

It introduced executive bonus blocks for failing companies.

Potential imprisonment for obstructing regulatory investigations.

And mandatory real time monitoring of all sewage outlets.

The system is clearly failing. Whether thirty five years of extraction can be reversed by regulation alone remains the open question.

English water companies were privatised debt-free in 1989 with £5 billion of taxpayer-funded debt written off. Since then, £65-85 billion has been paid in dividends to shareholders.

Thames Water accumulated £17.6 billion in debt. 3.6 million hours of raw sewage discharged into rivers in 2023. Bills rose 40% above inflation. Infrastructure decayed whilst shareholders profited.

Approximately 6 million people, 10% of England's population, receive artificially fluoridated water.

Scotland, Wales and Northern Ireland have no artificial fluoridation.

The largest fluoridated region is the West Midlands: Birmingham since 1964, Solihull, Sandwell, Dudley, Walsall, Wolverhampton and Coventry.

Sections 175 to 177 of the Health and Care Act 2022 transferred fluoridation decision making from local authorities to the Secretary of State for Health, effective 1 November 2022.

The stated rationale was that no new fluoridation scheme had been implemented for nearly 40 years.

Rather than asking why no local authority chose to fluoridate for four decades, the government removed local authorities from the decision entirely.

A consultation on expanding fluoridation across the broader North East covering approximately 1.6 million additional people was launched under these new centralised powers.

The estimated capital cost is £34 million.

The Health and Care Act 2022 transferred fluoridation authority from local councils to the Secretary of State for Health. One government minister can now impose fluoridation on any English water supply without local consent.

Approximately 6 million people in England receive fluoridated water. The pineal gland accumulates fluoride at 300mg/kg. Reverse osmosis removes 95-99%. Standard carbon filters remove none.