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

To ask the Secretary of State for Environment, Food and Rural Affairs, if he will make an assessment of the potential impact of septic tanks on the cleanliness of rivers; and if he will make it his policy to ban septic tanks (a) in the catchment areas of chalk streams and (b) near other watercourses.

Large numbers of properties in rural areas of England rely on on-site water treatment systems as they are not connected to mains sewerage systems. Septic tanks, the most common on-site sewage treatment systems in these areas, are regulated to ensure they are maintained properly and do not cause pollution. Through our long-term Plan for Water, the Government is committed to delivering a clean water environment for people and nature, including the impact of private sewerage systems on chalk streams. This aligns with our broader commitment to review private sewage discharges regulation to manage environmental risk.