Wessex Water scores 43/100 (Below expectations) on SINK's independent climate assessment — scored from public data only, no company payment can change a number. Last verified October 2026.
That places Wessex Water joint 281st of 799 companies scored, and 5th of 11 in Water & Sewerage.
Wessex Water reports operational and supply-chain emissions, including capital carbon. Its latest fall in emissions, from 105 to 96 ktCO2e, was attributed by the company to lower rainfall. Pollution incidents rose to 62 per 10,000 km of sewer in 2024, from 36 in 2023, against a target of 19.5, and storm overflow spills rose sharply in 2023. Ofwat confirmed an £11m enforcement package in December 2025, the company incurred a £23.5m underperformance payment for 2024–25, and in July 2024 the ASA banned a TV advert that omitted its 2-star Environment Agency rating.
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SINK = (0.3 × Base + 0.7 × Performance) × ScaleStrongest on Carbon Footprint — Operations and Carbon Footprint — Supply Chain (8/10, 6/10). Weakest on Water Impact and Controversies & Red Flags (2/10, 3/10).
12 sources used in this assessment. All publicly available. Each row shows which rubric questions it informed.
8 of 12 sources are third-party verified or public record.
“Carbon: Table 11A: Streamlined energy and carbon reporting, task force on climate-related financial disclosures report.”
“using the water industry's standardised Carbon Accounting Workbook since 2007.”
“Our landholding was valued at 14,348 BU.”
“Wessex Water said it had not met its targets for leakage or serious pollution incidents.”
“Ofwat has confirmed that Wessex Water will fund an £11m enforcement package after the company failed to operate, maintain and upgrade its wastewater network adequately”
If you believe a source has been misread or a newer version exists, submit a challenge.
Where Wessex Water sits among water & sewerage peers.
Among the 11 major water & sewerage brands we've scored, Wessex Water sits 5th of 11.
As Wessex Water's score updates, the trajectory will appear here.
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Wessex Water Services Limited is the regulated water and sewerage company for much of South West England and is part of the YTL group. It was incorporated in 1989 and is headquartered in Bath. Its filed accounts for the year to 30 June 2026 report revenue of £802.8m and an average of 2,768 employees. It is regulated by Ofwat and the Environment Agency.
Regional water and sewerage operator in England; comparable scale and regulatory environment.
View breakdown →Regional water and sewerage operator in England; comparable pollution and leakage regulatory scrutiny.
View breakdown →Regional water and sewerage operator in England; subject to Ofwat performance monitoring.
View breakdown →Regional water and sewerage operator in England; faces similar environmental compliance pressures.
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