asked Her Majesty's Government:

Whether they have made a recent assessment of the research into and development of dry toilet units as a water-saving device. [HL920]

The Government's market transformation programme (MTP) has published a number of documents related to the water use of WCs, including briefing notes that assess future consumption trends for WCs, and what actions are necessary to improve WC design and efficiency. Actions identified for further work include an evaluation of available research on the consumer acceptance of waterless toilets and a review of the potential for the use of waterless WCs in houses. These documents are available on the MTP website.