Who gains from saving nature
Ledger 1 : 33 — For each dollar financing nature-based solutions in 2023, about $33 financed activities harmful to nature. (UNEP)
Cases / Water use · United Kingdom · 1989–2026

England and Wales water privatisation and Thames Water: debt, dividends and the record Ofwat fine

Nature's voice · report
In 1957 my London stretches were declared biologically dead.
Did nature suffer? Yes. Harm is on record.
Recorded
What the record lacks: 2 none on record · 10 insufficient · 6 disputed · 1 unclear See the gaps

Since privatisation in 1989 the water companies of England and Wales have paid out large dividends while their debt grew. In May 2025 the regulator Ofwat fined Thames Water £122.7 million, reported as a record, and customers are due to pay higher bills for a £104 billion investment programme.

£122.7mOfwat fine on Thames Water, May 2025
Reported as a record fine; £18.2m of it related to a dividend paid in March 2024. Under Macquarie's control, 2007–2017, Thames Water paid more than £2.5bn in dividends while its debt rose from £3.6bn to £10.2bn (a different period).

Status As of October 2026: Ofwat's £122.7m fine on Thames Water (May 2025) stands; Water Magazine reported in March 2026 that Thames Water was considering a creditor-led recapitalisation with debt of about £20bn; no personal prosecution of executives was found.

What?
Debt, dividends and fines in the privatised water sector of England and Wales, centred on Thames Water, which Ofwat fined £122.7 million in May 2025, reported as a record; £18.2 million of the fine related to a dividend paid in March 2024. Consultancy.uk
Where?
England and Wales; Thames Water serves the River Thames area of London.
When?
Privatisation in 1989; Macquarie control of Thames Water 2007–2017; dividend March 2024; fine proposed August 2024 and imposed May 2025; status reported March 2026.
Who?
Gained
  • Thames Water investors (including Macquarie, 2007–2017) — Received dividends above £2.5 billion in 2007–2017 while debt rose from £3.6 billion to £10.2 billion. The Conversation (K. Bayliss)
  • Thames Water shareholders — A £131.3 million dividend was paid in March 2024; £18.2 million of the later fine related to it. Consultancy.uk
Lost
Harmed
  • River Thames — Zoological Society of London (2021): slight long-term fish deterioration, more nitrate, and a threat from storm sewage overflows, alongside more oxygen and less phosphorus. The report does not attribute these to Thames Water. Zoological Society of London
Why?
Ofwat fined Thames Water in what Envirotec described as a crackdown on reported sewage spills, with part of the sum relating to a dividend paid in March 2024; the sector's debt and dividend record is the context. Consultancy.uk
How?
Ofwat proposed fines in August 2024 and imposed £122.7 million on Thames Water in May 2025; PR24 set bill increases for 2025–30. Ofwat said penalties could not be recovered from customers. A 2025 act banned bonuses and introduced prison for executives who obstruct investigations. Construction Enquirer
In proportion The sources reviewed give no like-for-like comparison: the fine (2025) and the Macquarie-period dividends (2007–2017) cover different years.
6 of 6 questions answered from the record

What happened

The record, in order.

Water supply and sewerage in England and Wales was privatised in 1989. According to a Wikipedia entry on the privatisation, the government took on about £5 billion of the sector's debt at the sale and gave the companies a £1.5 billion "green dowry". The New Statesman reported in April 2024 that the ten large water companies had paid £72 billion in dividends and accumulated £60 billion of debt from the 1990s to 2024, and that bills had risen 363% since privatisation.

Thames Water was controlled by the Australian financial group Macquarie between 2007 and 2017 (one source dates the start to 2006). According to an article by K. Bayliss in The Conversation (13 August 2021), more than £2.5 billion in dividends was paid in that period and the company's debt rose from £3.6 billion to £10.2 billion; in 2021 about 20% of the average bill went to interest and dividends. Other sources give different figures for the same period (see Unknown). In August 2021 Macquarie announced that it had agreed to acquire a majority stake in Southern Water with capital of more than £1 billion.

On 6 August 2024 Ofwat proposed fines of £168 million on three companies: £104 million on Thames Water, £47 million on Yorkshire and £17 million on Northumbrian, and said the money could not be recovered from customers. In May 2025 Ofwat fined Thames Water £122.7 million, reported by Consultancy.uk as a record fine and by Envirotec as part of a crackdown on reported sewage spills. According to Consultancy.uk, £18.2 million of the total related to a £131.3 million dividend paid in March 2024, which it described as unearned. No record of any personal prosecution of Thames Water executives was found.

In December 2024 Ofwat approved £104 billion of spending for 2025 to 2030 in its PR24 price review. Average household bills for water and wastewater are due to be 36% higher in 2029–30 than in 2024–25; water-only bills 22% higher. Companies had asked for 44%, according to Pinsent Masons. Average bills were also recorded as rising 31% in April 2025 (source not identified). The Water (Special Measures) Act, reported by Farming UK on 25 February 2025, banned bonuses and introduced imprisonment for executives who obstruct investigations. A King's College London academic wrote in August 2024 that a £104 million sewage fine equalled about 5% of company revenue and might be reflected in bills. The Tideway tunnel, built to catch overflowing sewage and costing about £5 billion, was paid for by customers.

Ofwat's chief executive from 2013 to 2017, Cathryn Ross, joined Thames Water as strategy and regulatory affairs director in March 2021 and was named interim co-chief executive in 2023. On the river itself, the Zoological Society of London (ZSL) reported in 2021, using 17 indicators, higher oxygen and lower phosphorus in the Thames, together with a slight long-term deterioration in fish, rising nitrate and the threat of storm sewage overflows. In March 2026 Water Magazine reported that Thames Water was considering a creditor-led recapitalisation proposal, with debt of about £20 billion.

  1. 1957Parts of the Thames in London declared biologically dead (as recalled by the Zoological Society of London)
  2. 1989Water privatised; government takes on about £5bn of debt and gives companies a £1.5bn "green dowry" (per Wikipedia entry)
  3. 2007Macquarie controls Thames Water (to 2017): dividends above £2.5bn and debt rising from £3.6bn to £10.2bn (The Conversation)
  4. 2013Cathryn Ross becomes chief executive of Ofwat (to 2017)
  5. 2021March: Ross joins Thames Water; ZSL publishes State of the Thames; about 20% of the average bill goes to interest and dividends. August: Macquarie announces agreement to acquire a majority of Southern Water
  6. 2023Ross named interim co-chief executive of Thames Water
  7. 2024March: Thames Water pays a £131.3m dividend. 6 August: Ofwat proposes fines of £168m on three companies. December: Ofwat approves £104bn for 2025–30 (PR24)
  8. 202525 February: Water (Special Measures) Act reported. May: Ofwat fines Thames Water £122.7m, of which £18.2m relates to the dividend
  9. 2026March: Water Magazine reports Thames Water considering a creditor-led recapitalisation; debt about £20bn

What was said

Claims, in the words of those who made them.

Where accounts differ

Each party's account, side by side, with its source. The record does not settle these points; it shows them.

Can the cost of the fines be recovered from customers?
Government and regulators
Ofwat

Said in August 2024 that the proposed fines of £168 million could not be recovered from customers.

Construction Enquirer
Researchers
Academic at King's College London

Wrote in August 2024 that a £104 million sewage fine equalled about 5% of company revenue (about £2,200 million) and might be reflected in bills; customers also paid for the roughly £5 billion Tideway tunnel.

King's College London (The Conversation)
How much should household bills rise for 2025–30?
Company or project
Water companies

Asked for bill increases of 44%.

Pinsent Masons (Out-Law)
Government and regulators
Ofwat

Approved £104 billion of spending and average increases of 36% for water and wastewater by 2029–30 (22% for water only).

Pinsent Masons (Out-Law)
How large was the dividend behind the £18.2m part of the fine?
Press and investigations
Consultancy.uk

£18.2m of the £122.7m related to a dividend of £131.3m paid in March 2024.

Consultancy.uk
Press and investigations
Hargreaves Lansdown

Reported the dividend as £158.3m; reported but not independently verified.

Hargreaves Lansdown

How it looked

What was shown, beside what was recorded.

Shown

  • Stretches of the Thames in London declared biologically dead in 1957 now host seals, seahorses and small sharks.
    Zoological Society of London (State of the Thames) · Zoological Society of London
  • The 2024 price review was presented as allowing £104bn of spending in 2025–30, against average bill increases of 36% for water and wastewater; it was reported under a headline saying it quadruples investment in the sector over five years.
    Environment Analyst (headline), reporting Ofwat's PR24 decision · Environment Analyst
  • The May 2025 penalty was described as a record fine.
    Consultancy.uk (headline) · Consultancy.uk
  • Thames Water announced the appointment of a new strategy and regulatory affairs director in March 2021.
    Thames Water press release · Thames Water

Recorded

  • May 2025: Ofwat fined Thames Water £122.7 million, reported as a record fine; £18.2 million of it related to a £131.3 million dividend paid in March 2024.
    Consultancy.uk
  • 6 August 2024: Ofwat proposed fines of £168 million on Thames Water (£104m), Yorkshire (£47m) and Northumbrian (£17m) and said they could not be recovered from customers.
    Construction Enquirer
  • 2007–2017, under Macquarie's control: Thames Water dividends above £2.5 billion; debt up from £3.6 billion to £10.2 billion; in 2021 about 20% of the average bill went to interest and dividends.
    The Conversation (K. Bayliss)
  • The ten large water companies paid £72 billion in dividends and accumulated £60 billion of debt from the 1990s to 2024; bills rose 363% since privatisation.
    New Statesman
  • December 2024: Ofwat approved £104 billion of spending for 2025–30; average bills for water and wastewater to rise 36% by 2029–30 compared with 2024–25 (water only: 22%); companies had asked for 44%.
    Pinsent Masons (Out-Law)
  • The roughly £5bn Tideway tunnel to catch overflowing sewage was paid for by customers.
    King's College London (The Conversation)
  • Cathryn Ross, Ofwat's chief executive 2013–2017, became Thames Water's strategy and regulatory affairs director in March 2021 and was named interim co-chief executive in 2023.
    Thames Water
  • Zoological Society of London, 2021 (17 indicators): more oxygen and less phosphorus in the Thames; slight long-term deterioration in fish, more nitrate, and a threat from storm sewage overflows. The report does not attribute these changes to Thames Water.
    Zoological Society of London
  • The Water (Special Measures) Act, reported 25 February 2025, banned bonuses and introduced imprisonment for executives who obstruct investigations.
    Farming UK
  • March 2026: Thames Water considering a creditor-led recapitalisation proposal; debt about £20 billion.
    Water Magazine
  • No record that Thames Water executives were prosecuted personally.

Who gained

Money that reached nature, beside money that stayed elsewhere.

Reached nature or the ground

Not published
No figure published.

Gained elsewhere

> £2.5bn
Dividends paid while Macquarie controlled Thames Water> £2.5bn
The Conversation, 2021. Another source gives £2.7bn for 2006–2017 (not independently verified).
Currency: GBP · Window: 2007–2017. All figures cover the same period. * Estimate built from cited figures.

Responses on record

  • Ofwat (2024-08-06): Said, when proposing fines of £168 million on Thames Water, Yorkshire and Northumbrian, that the money could not be recovered from customers. · Construction Enquirer
  • Thames Water (2021-03): Announced the appointment of Cathryn Ross as strategy and regulatory affairs director. · Thames Water
  • Cathryn Ross (date not given): Told a parliamentary committee, as recorded, that she would not apologise for her role at Ofwat (date and committee not identified).
  • Macquarie (2021-08): Announced in August 2021 an agreement to acquire a majority stake in Southern Water with capital of more than £1 billion. No Macquarie statement on Thames Water dividends or debt was found. · Macquarie

In court and with insurers

Every proceeding and every insurer decision on record.

Lawsuits and rulings

  1. 2024-08–2025-05Claimant won£122.7m £122.7 million penalty (millions)
    Ofwat enforcement against Thames Water (sewage spills and dividend)
    Ofwat (economic regulator) · Regulatory · Ofwat → Thames Water

    Ofwat proposed a £104 million fine on Thames Water in August 2024 and fined the company £122.7 million in May 2025, reported as a record (Envirotec described it as part of a crackdown on reported sewage spills). £18.2 million of the total related to a £131.3 million dividend paid in March 2024. No personal prosecution of executives was found. Consultancy.uk

  2. 2024-08–unknownOutcome not on record
    Ofwat proposed penalties on Yorkshire and Northumbrian
    Ofwat (economic regulator) · Regulatory · Ofwat → Yorkshire and Northumbrian (as named in the source)

    Proposed in August 2024 together with the Thames Water proposal: £47 million on Yorkshire and £17 million on Northumbrian, £168 million in total for the three companies. The final outcome was not found. Construction Enquirer

Insurers

No insurer decision on record.

What nature saw

Outcomes measured on the ground, and nature's note.

Nature's report opens this page. Below: further outcomes measured on the ground.

Ofwat fine on Thames Water
£122.7m
May 2025; £18.2m related to a dividend. No source reviewed records a fine payment reaching the river.
Thames Water dividends under Macquarie, 2007–2017
above £2.5bn
Debt rose from £3.6bn to £10.2bn over the same period (The Conversation, 2021)
Oxygen and phosphorus in the Thames, 2021
Oxygen up, phosphorus down
ZSL State of the Thames, 17 indicators
Fish, nitrate and storm overflows, 2021
Fish slightly down, nitrate up
ZSL: slight long-term deterioration in fish, more nitrate, threat from storm sewage overflows; a 2026 ZSL report noting a slight decline in some fish is unverified

What we don't know

Undisclosed, unproven, untried: recorded as data.
No court case

Court

  • Unclear Ofwat proposed penalties on Yorkshire and Northumbrian: outcome not on record.

Figures

  • Insufficient Dividends: Reported but not independently verified: Thames Water dividends 2006–2017; conflicts with the figure above.
  • Insufficient Fines: Reported but not independently verified: Southern Water fine, July 2021 (Defra blog).
  • Insufficient Sewage spill hours: Reported but not independently verified: England, 2024 (Environment Agency data).
  • Insufficient Sewage spills: Reported but not independently verified: England, 2024 (Environment Agency data).

Accounts

  • Disputed Can the cost of the fines be recovered from customers?
  • Disputed How much should household bills rise for 2025–30?
  • Disputed How large was the dividend behind the £18.2m part of the fine?

Record

  • Disputed Conflicting figures: Macquarie-era Thames Water dividends are given as more than £2.5 billion for 2007–2017 (The Conversation) and as £2.7 billion for 2006–2017 (reported but not independently verified); debt is given as rising from £3.6 billion to £10.2 billion, from about £3 billion to £10 billion, from £3.4 billion to £10.8 billion, or to about £11 billion.
  • Disputed Conflicting figures: the March 2024 dividend is given as £131.3 million (Consultancy.uk) and as £158.3 million (Hargreaves Lansdown, reported but not independently verified).
  • Disputed Conflicting figures: sector-wide dividends and borrowing are given as £72 billion and £60 billion from the 1990s to 2024 (New Statesman) and, in a Financial Times analysis, as £78 billion of dividends and £64 billion of new borrowing over 1991–2023 (reported but not independently verified).
  • None on record No record was found that Thames Water executives were prosecuted personally.
  • Insufficient Reported but not independently verified: Southern Water was fined £90 million in July 2021 for deliberate sewage discharges in 2010–15 and for misleading the regulator (Defra blog; a court is not named in the sources reviewed).
  • Insufficient Reported but not independently verified: the split of the May 2025 fine into £104.5 million for sewage-related breaches and £18.2 million for the dividend, and a payment plan under which one fifth was due in September 2025 and the rest by 2030 or on restructuring.
  • Insufficient Reported but not independently verified: 2024 recorded 450,398 sewage overflow spills lasting 3.61 million hours, an average of 31.8 hours per overflow (Environment Agency data).
  • Insufficient Reported but not independently verified: the Independent Water Commission (Cunliffe) recommended in July 2025 that Ofwat be abolished and said bills would rise 30% over five years.
  • Insufficient Reported but not independently verified: a 2026 Zoological Society of London report noting warming of about 0.2 degrees Celsius a year and a slight decline in some fish species.
  • Insufficient Not verified: that investment is added to the regulated asset base and earns a return for the company.
  • None on record Who bore the fine in practice (company, shareholders or customers): no data. Ofwat said proposed fines could not be recovered from customers; a King's College London academic said a sewage fine might be reflected in bills.

Did the harm stop?

Not established. Ofwat fined Thames Water in May 2025 and a 2025 act banned bonuses for such companies; the record does not show that sewage discharges or dividends stopped. The monitoring figures cover 2024 and are not independently verified.

Who paid?

The Tideway tunnel, costing about £5 billion, was paid for by customers, and average bills are due to rise 36% by 2029–30. Ofwat said in August 2024 that its proposed fines could not be recovered from customers; who bore the fine in practice is not recorded. Investors received the dividends.

Sources

Voices on record: ✓ Company or project✓ Government and regulators— Courts✓ Press and investigations— Communities and civil society✓ Researchers

Company or project

Government and regulators

Press and investigations

  6. Sold down the river
    New Statesman · 2024-04-10

Researchers

  1. State of the Thames
    Zoological Society of London · 2021
  2. Water companies face big fines but approach to waste
    King's College London (The Conversation) · 2024-08-14

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