Dwr Cymru Welsh Water

Does the core business genuinely avoid or reduce emissions, or build climate resilience? Share of revenue that is actually 'green'. Fossil-dependent models score low.

Water and sewerage utilities inherently consume large amounts of energy and produce methane from sewage treatment, making deep decarbonisation essential but slow; Welsh Water's stated ambition of energy neutrality via self-generation is credible in direction but unverified in progress, and serial sewage spills into protected habitats represent direct, ongoing environmental harm that undercuts any climate-resilience or mitigation framing.

Credible, science-based targets (SBTi), a real net-zero plan with progress to date, and CDP disclosure — not just a dated press release.

Welsh Water claims a target to reduce total carbon emissions by 90% by 2030 and aims for energy neutrality, but no SBTi validation, no CDP submission score, and no independently verified annual progress data were found in public sources; the AMP8 regulatory period now includes an Ofwat GHG performance commitment, which is externally monitored but is a regulatory floor, not a science-based ambition.

Operational footprint, labour and social practices, and governance quality across the company's own operations and supply chain.

The not-for-profit ownership model and reinvestment of surpluses represent genuine governance strength, and the company serves a critical public-service role for 3.1 million customers; however, NRW downgraded Welsh Water from four stars (2020) to two stars (2022–2023), citing its worst-ever environmental performance in 2023, and Ofwat fined the company £40 million in December 2024 for misleading customers and regulators on key environmental commitments including leakage.

Quality of disclosure, independent third-party verification, and how much hard data backs the company's claims.

Welsh Water publishes a corporate sustainability microsite and a Welsh Water 2050 long-term strategy document, and submits regulatory self-monitoring data to NRW; however, regulators found that the quality of self-monitoring data 'had noticeably deteriorated' in 2020 and a decrease in incident self-reporting was recorded in 2023, directly undermining claims of transparent disclosure, and no CDP score or third-party verified carbon accounting was found.

Controversies, litigation, pollution, fossil-fuel lobbying, conflict-zone involvement and governance scandals. Higher means cleaner.

Welsh Water has accumulated over £1.93 million in prosecution fines from NRW since 2015, pleaded guilty in 2024–2025 to over 800 permit breaches and to polluting a protected SSSI/SAC/Ramsar saltmarsh habitat, faced a £40 million Ofwat penalty for misleading regulators on leakage and consumption targets, and recorded its worst-ever environmental performance in 2023 — a pattern of repeated, material environmental harm that is the dominant integrity risk.