asked Her Majesty's Government:

Whether they will consider stronger measures to promote greywater information and usage advice for United Kingdom households to re-use domestic water supplies in regular WC cleansing practices. [HL3986]

Greywater harvesting systems are still largely regarded as a developing technology in the UK. Research conducted in the area of greywater harvesting has tended to conclude that these systems are not generally economic, except perhaps for larger users such as hotels and public buildings. The feasibility of installing greywater systems in households still needs to be established.

To address the information gap, the Government's market transformation programme is looking at technologies that could potentially reduce overall water consumption by reusing rainwater and/or greywater. A project has been started to develop the necessary evidence, economic case, feasibility, performance standards, policy action plan and impact scenarios to determine the best use of rainwater/greywater technology.