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Executive overview
Key findings
£1,443.2 million: revenue in FY2025-26, up from £992.7 million in FY2024-25
£8,391.5 million: regulatory capital value at 31 March 2026, with net debt at 67% of it
£641: average annual bill for 2025-30 set by the Competition and Markets Authority, against £420 in 2024/25
1 star: Environment Agency environmental performance rating for 2025
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Buyer relevance
Who the report is for
Analysts and lenders needing a quick reference on Southern Water
Pull revenue, operating profit, regulatory capital value, gearing and ratings from FY2016-17 to FY2025-26 in one table set.
Suppliers screening the company before bidding
See the £3.1 billion delivery framework, the five named major projects and the Inspectorate deadlines from October 2026 in one place.
Consultants and public-sector teams in the South East
Check the company's price control, bill levels and regulatory actions to date before meetings or submissions.
03
Decision scope
Questions answered
What did the Competition and Markets Authority decide for Southern Water?
It set allowed revenue for 2025-30 at £6,646 million and an average bill of £641 (2022/23 prices), against the £710 the company requested.
How large is the company's asset base?
Regulatory capital value was £8,391.5 million at 31 March 2026, with net debt at 67% of it.
How did Southern Water perform environmentally in 2025?
The Environment Agency rated it 1 star, with 301 pollution incidents, 12 of them serious, and 64 sewerage incidents per 10,000 km of sewer.
Has the company paid dividends?
No dividends have been paid to external shareholders since 2017-18; shareholders invested £900 million in FY2025-26 and committed a further £300 million.
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Inside the report
Inside the complete report
Executive Overview
Utility and Service Mandate
Water Resources and Supply
Infrastructure and Treatment
Networks and Assets
Wastewater and Resource Management
Financial Position
Investment and Major Projects
Tariffs and Customer Context
Governance and Regulation
Climate and Resilience
Forward Developments
Key Intelligence Summary
Source Register
05
Public preview
What to watch next
Financial Position
Receipt of the final £300 million; the FY2026-27 annual report; any rating action following the Moody's positive outlook.
Investment and Major Projects
Ofwat's final cost change decision; the Hampshire examination timetable; the Isle of Wight Council decision on Sandown.
Tariffs and Customer Context
Charges for 2027-28, when the Competition and Markets Authority's uplift applies, and any bill effect from Ofwat's cost change decision.
Governance and Regulation
The December 2026 hearing; the next steps in the Medway criminal case; Ofwat's monitoring category in its next financial resilience report.
Wastewater performance 2021-2025 and the financial series from FY2016-17 to FY2025-26.
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Included
What you receive
The complete PDF report: 13 pages, 14 sections, 15 tables and a register of 27 sources.
This edition
November 2026, First edition.
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Evidence & method
Evidence and method
The profile draws on Southern Water's audited annual reports from FY2016-17 to FY2025-26, Ofwat and Competition and Markets Authority price control documents, and Environment Agency and Drinking Water Inspectorate performance publications, including the regulators' October 2026 joint report. Project and legal status comes from Planning Inspectorate, Environment Agency, shareholder and contractor announcements checked on 11 November 2026.
Sources
27 sources, listed in the report's source register. Evidence current to 11 November 2026. Principal data periods: FY2025-26 annual report (year ended 31 March 2026) with earlier annual reports from FY2016-17; regulators' calendar 2025 and FY2025-26 performance data; price control 2025-30. Project, drought and legal status checked on 11 November 2026. All currency is pounds sterling (£)..
Evidence boundaries
This report uses authoritative source material available at the stated research cutoff. It distinguishes published facts, calculated values and analytical interpretation. No independent modelling is performed. Forward-looking analysis reflects published plans, documented trends and stated uncertainties. It does not constitute legal, financial, investment or engineering advice.
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Lead analyst
Robert C. Brears
Founder, Our Future Water Intelligence
Robert C. Brears is a water-security specialist and author whose work examines utility governance, infrastructure investment, climate resilience and long-term water-system change for executive and policy audiences.
- Decision-focused utility intelligence
- Published water-policy author
- Evidence-grounded system analysis
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Buyer FAQs
Before you purchase
Who can use the report?
Licensed for internal use within one purchasing organization. The PDF and its contents may be shared with colleagues within that organization. External redistribution, resale and public publication are prohibited without permission.
How is the report delivered?
The PDF is available to download immediately after confirmed payment, through our secure delivery system.
Can my organization buy wider access?
Institutional purchasing: For invoice enquiries, multi-organization licensing or broader access requirements, contact Our Future Water Intelligence.
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Utility Intelligence Profile: Southern Water
- Format
- Length
- 13 pages
- Edition
- November 2026, First edition
- Price
- USD 99
11
Report details
Publication details
- Publisher
- Our Future Water Intelligence
- Report family
- Utility Intelligence Profile
- Edition
- November 2026, First edition
- Format
- Length
- 13 pages
- Reference
- OFW_EXT_SOUTHERN_WATER_UTILITY_INTELLIGENCE_PROFILE_05be9ffe1f60
- Evidence current to
- 11 November 2026
14
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