Question to the Department for Environment, Food and Rural Affairs:

To ask His Majesty's Government what assessment they have made of the use of Incinerator Bottom Ash Aggregate as a sustainable aggregate.

The Environment Agency considers incinerator bottom ash aggregate (IBAA) to be a waste. The Environment Agency considered issues such as IBAA being used in place of virgin aggregate, and its use avoiding the need to landfill, along with economic impacts, when deciding whether to have a regulatory position statement (RPS). The Environment Agency has carried out a pollution risk assessment of the use of IBAA, and is satisfied that it does not pose a significant risk to people or the environment when it is used under the conditions of the RPS.

The RPS is still active, and can be viewed here. A copy is attached to this answer.