Water & Sewerage Industry
Financial History

Transparency

Sources & Methodology

Primary Sources

• Ofwat Water Company Performance Reports (annual, 2011–2025)
  The main post-2010 source for sector-aggregate revenue, CAPEX, opex, dividends and net debt. Published annually by the Water Services Regulation Authority (Ofwat).
  ofwat.gov.uk → Company performance reports
• Ofwat June Returns (1990–2011)
  The predecessor regulatory return, submitted annually by all licensed companies. The primary source for pre-2011 revenue, expenditure and balance sheet data.
  ofwat.gov.uk → Annual performance reports
• NAO - The Economic Regulation of the Water Sector (2015)
  National Audit Office report providing independent historical analysis of sector finances, investment and regulatory performance since privatisation.
  nao.org.uk → The economic regulation of the water sector
• Yearwood, K. (2018) - "The Privatised Water Industry in the UK: An ATM for Investors"
  University of Greenwich. Peer-reviewed analysis of financial flows since privatisation, including the calculation that £1.5bn/year in dividends was sustainable without any additional debt. The primary source for pre-2000 estimated figures.
  gala.gre.ac.uk → Full paper (open access)
• Financial Times - Water Industry Financial Analysis (various, 2018–2024)
  FT investigations into water company balance sheets, debt structures and dividend flows, drawing on company accounts and Ofwat data. Used for cross-validation of aggregate debt and dividend totals.
  ft.com → Water industry coverage
• Water UK - Industry Facts & Figures
  The industry body for water and wastewater companies in England, Scotland, Wales and Northern Ireland. Used for sector-level investment totals and AMP period summaries.
  water.org.uk → Industry data

Per-Series Methodology

Revenue

Total regulated turnover for the sector, sourced directly from Ofwat June Returns (1990–2010) and Water Company Performance Reports (2011–2025). Pre-2000 values are estimates based on published Ofwat data and Yearwood (2018).

CAPEX

Total capital expenditure (infrastructure and non-infrastructure renewal plus enhancement), sourced from Ofwat regulatory returns. Covers the 16 regulated companies in England & Wales. Pre-2000 estimates derived from Yearwood (2018) and NAO (2015).

Opex

Total operating expenditure excluding depreciation, sourced from Ofwat regulatory returns. Pre-2000 estimates derived from Yearwood (2018).

Net Profit (estimated)

A derived, indicative series - not taken directly from company accounts. Estimated as: Revenue − Opex − Depreciation − Net Interest, where Depreciation ≈ 15% of the CAPEX figure and Net Interest ≈ average net debt × 5% cost of capital. This is a simplification; actual reported profits will differ by company and year. Treat as indicative of sector-level trends only.

Dividends

Dividends declared by regulated operating companies, sourced from Ofwat statutory returns. The ~£54bn cumulative total (1990–2024) is consistent with figures cited in Ofwat's own monitoring publications and the FT. Note: dividends paid at holding-company level may differ and are not fully captured here.

Annual Borrowing

A derived series: the year-on-year change in cumulative net debt. A positive value means net new debt was raised in that year; a negative value (as in 2015) means net debt was reduced. This series is only as reliable as the underlying net debt figures.

Cumulative Net Debt

Total net debt across all regulated companies at year-end, sourced from Ofwat Annual Reports, company accounts and FT analysis. At privatisation in 1989 this was zero, following the government's write-off of all predecessor-body liabilities.

Coverage & Limitations

This dataset covers the 16 largest regulated water and sewerage companies in England and Wales only, under Ofwat's jurisdiction. It does not include Scottish Water (publicly owned, regulated by the Water Industry Commission for Scotland) or Northern Ireland Water (publicly owned, regulated by the Utility Regulator).

All figures are nominal (not adjusted for inflation). A pound in 1990 is worth approximately £2.50 in 2025 terms. Real-terms comparisons - particularly of revenue growth and investment levels - would look materially different. The pre-2000 shaded region on the chart indicates years where figures are estimates rather than directly reported regulatory data; they should be treated with correspondingly greater caution.

This page is an independent data resource and is not affiliated with, endorsed by, or produced in partnership with Ofwat, Water UK, or any water company.