Yorkshire Water Services Limited is the regulated water and sewerage company for Yorkshire, England, and part of the Kelda Group.
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Yorkshire Water's market-based emissions rose from 281 to 295 ktCO2e between FY2024 and FY2025, and Scope 1 rose from 85 to 88 kt. Sewerage pollution incidents rose from 117 in 2022 to 151 in 2024, 13 of them serious, and the Environment Agency rated it 2 stars. In March 2025 Ofwat found breaches of wastewater rules and accepted a £40m undertakings package. Its 2030 Scope 1 and 2 carbon-neutral goal relies on offsets for residual emissions, and its reported Scope 3 covers three categories.
Yorkshire Water scores 39/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Fees pay for the review, never the result. Last verified October 2026.
That places Yorkshire Water joint 385th of 847 companies scored, and 8th of 11 in Water & Sewerage.
Where Yorkshire Water sits among water & sewerage peers.
Among the 11 major water & sewerage brands we've scored, Yorkshire Water sits 8th of 11.
Its three lowest-scoring questions, and what the evidence didn't show.
Total market-based emissions rose from 281 ktCO2e (FY2024) to 295 ktCO2e (FY2025); Scope 1 rose 85 to 88 kt.
The full reasoning is in the ten questions below.
Company declined green energy procurement, raising market-based Scope 2.
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Get in touch →Strongest on Carbon Footprint — Operations and Transparency & Accountability (7/10, 7/10). Weakest on Emissions Trajectory and Water Impact (2/10, 2/10).
The 3 companies in the sector scoring nearest above Yorkshire Water.
Wessex Water reports operational and supply-chain emissions, including capital carbon.
See the breakdown →Northumbrian Water's net market-based operational emissions fell from 68.6 to 15.9 ktCO2e between 2019/20 and 2024/25, relying on renewable electricity and gas certificates, while gross location-based emissions moved from 163.3 to 152.6 kt.
See the breakdown →Anglian Water's gross reported emissions rose from 265,219 to 297,156 tCO2e between 2022/23 and 2024/25.
See the breakdown →The formula and all 12 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
8 of 12 sources are independent of the company.
“Emissions are all UK onshore and have been independently verified (this year by BSI) against the ISO 14064-1 greenhouse gas emission verification standard”
“99.67% satisfactory sludge disposal and use”
“Heating water in homes and businesses makes up 81% of our scope 3 footprint.”
“Our investigation has found serious failures in how Yorkshire Water has operated and maintained its sewage works and networks”
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Yorkshire Water Services Limited is the regulated water and sewerage company for Yorkshire, England, and part of the Kelda Group. It was incorporated on privatisation in 1989 and is headquartered in Leeds. Its filed accounts for the year to 31 March 2026 report revenue of £1,639.8m and an average of 4,481 employees. It is regulated by Ofwat and the Environment Agency.
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