Scottish Water scores 46/100 (Making progress) on SINK's independent climate assessment — scored from public data only, no company payment can change a number. Last verified October 2026.
That places Scottish Water joint 222nd of 799 companies scored, and 4th of 11 in Water & Sewerage.
Scottish Water's operational emissions, audited to ISO 14064-1, fell from 462,000 tCO2e in 2006/07 to 220,000 tCO2e in 2024/25, and have been roughly flat for three years. It does not publish emissions from its capital programme of about £1bn a year. In 2025 it recorded 100,041 storm overflow events, with monitoring at 30% of sites. In 2024/25 waste water compliance was 96.7% and Category 3 pollution incidents rose to 199.
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SINK = (0.3 × Base + 0.7 × Performance) × ScaleStrongest on Carbon Footprint — Operations and Transparency & Accountability (8/10, 7/10). Weakest on Targets & Commitments and Water Impact (4/10, 4/10).
8 sources used in this assessment. All publicly available. Each row shows which rubric questions it informed.
“Operational carbon reporting is audited externally by Achilles to ISO:14064-1.”
“was 220,434 tCO2e this compares to 224,980 tCO2e last year.”
“As a result, the total reported operational footprint for 2025/26 was 226,188 tCO2e.”
“Annual monitoring data is now available for 30% of all sites, compared to just 6% in previous years.”
“spilled wastewater 365 times on 124 different days in 2023”
“Both Sepa and Scottish Water said Eastfield was now operating in line with Sepa's rules, with further improvements to be made.”
“Climate change mitigation and adaptation are integral to the provision of essential water and wastewater services on a sustainable basis.”
“Scottish Water is a statutory corporation that provides water and sewerage services across Scotland.”
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Where Scottish Water sits among water & sewerage peers.
Among the 11 major water & sewerage brands we've scored, Scottish Water sits 4th of 11.
As Scottish Water's score updates, the trajectory will appear here.
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Scottish Water is the publicly owned water and sewerage provider for Scotland, accountable to the Scottish Parliament. It was formed in 2002 and is headquartered in Dunfermline. Its annual report and accounts for the year to 31 March 2026 report group revenue of £2,360.3m and an average of 5,076 employees, both including the Business Stream retail subsidiary.
Direct peer: regional English water and sewerage utility with similar service scope and scale.
View breakdown →Direct peer: major English water utility; higher urbanization and network stress than Scottish Water.
View breakdown →Direct peer: regional UK water and sewerage operator with comparable regulatory and infrastructure challenges.
View breakdown →Peer water and sewerage company in Great Britain, same sector and regulatory model.
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