Overview
- A planned blast at Breedon Group’s Taffs Well Quarry on Thursday sent a fast-moving wall of brown water, mud and rocks through Gwaelod‑y‑Garth, residents said.
- The HSE has begun a formal investigation and is working with South Wales Police, which says it is not conducting a criminal probe.
- Cardiff Council and emergency services report 15 homes were affected and 13 were evacuated, with council-owned sports pitches and highways left caked in mud and strewn with rocks.
- Authorities have warned people and pets to avoid local streams and rivers because of possible contamination while clean-up teams and council crews clear debris.
- Breedon says it is cooperating with authorities and supporting the community, and regulators’ findings could prompt further action on quarry safety, repairs and compensation for damaged properties.