Dŵr Cymru Welsh Water scores 37/100 (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 Dŵr Cymru Welsh Water joint 421st of 806 companies scored, and joint 9th of 11 in Water & Sewerage.
Dŵr Cymru Welsh Water's total market-based emissions rose 9% to 443.4 kt in 2025/26, and its emissions targets are under review. Natural Resources Wales recorded 155 pollution incidents in 2024, the highest in a decade, and kept the company at two stars ('requires improvement') for a third year. In 2025 it was sentenced in four criminal cases under environmental permitting rules. Ofwat ordered £40m of redress for misleading leakage and consumption data in 2024 and proposed a £44.7m enforcement package in March 2026.
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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 Emissions Trajectory (1/10, 1/10).
10 sources used in this assessment. All publicly available. Each row shows which rubric questions it informed.
“The emissions data on page 25 has been verified by an independent third party.”
“Separately from the CAW, Welsh Water have undertaken their own estimates & studies on the emissions associated with the purchase of Capital Goods & Services”
“the company was responsible for a total of 155 pollution incidents during 2024 – 132 from sewerage assets and 23 relating to water supply.”
“Samples collected by officers found ammonia levels to be significantly over the 1.1mg/L threshold for a SSSI.”
“It says 2024 saw its highest number of pollution incidents in a decade”
“The generation will be equivalent to around 3% of Welsh Water’s annual electricity use”
“align with our goal of energy neutrality by 2050”
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Where Dŵr Cymru Welsh Water sits among water & sewerage peers.
Among the 11 major water & sewerage brands we've scored, Dŵr Cymru Welsh Water is tied =9th of 11, with 1 other.
As Dŵr Cymru Welsh Water's score updates, the trajectory will appear here.
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Dŵr Cymru Welsh Water is the water and sewerage company for most of Wales and parts of England, owned since 2001 by Glas Cymru. It was incorporated in 1989 and is headquartered in Cardiff. Its filed accounts for the year to 31 March 2026 report revenue of £1,169.8m and an average of 4,056 employees. It is regulated by Ofwat and Natural Resources Wales.
Direct peer in UK water and sewerage sector; comparable scale and regulatory environment.
View breakdown →Direct peer in UK water utilities; similar regulatory scrutiny and environmental performance pressures.
View breakdown →Direct peer in UK water sector; operates under same Ofwat and Environment Agency framework.
View breakdown →Direct peer; largest English water company with parallel wastewater and pollution incident challenges.
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