Bs 8558 Pdf May 2026

Overview — BS 8558 (surface water drainage guidance)

BS 8558 is British Standards guidance supporting the design, installation and maintenance of sustainable drainage systems (SuDS) and conventional surface water drainage for new developments. It interprets and expands on the principles in BS EN 752 and provides recommended good practice for planners, designers, contractors and maintainers.

Hygiene and Safety: A significant focus of the 2015 revision is the control of Legionella and other waterborne pathogens. It aligns with health and safety codes like HSE ACOP L8 and HSG274. Key Content and Guidance bs 8558 pdf

What is BS 8558?

BS 8558:2015 (which superseded BS 6700:2006+A1:2009) is titled "Guide to the design, installation, testing, operation and maintenance of services supplying water for domestic use within buildings and their curtilages." Overview — BS 8558 (surface water drainage guidance)

• Protection of public health: by preventing backflow and contamination of potable water supplies
• Reduced risk of waterborne diseases: by ensuring the safety of potable water systems
• Compliance with regulatory requirements: by meeting the requirements of the standard

Key Areas Covered by BS 8558:

• Cold water services – storage cisterns, booster sets, and pipe sizing.
• Hot water systems – including temperature control to prevent legionella.
• Backflow prevention – fluid categories and specific devices (RPZ valves, Type AA, AB, etc.).
• Water storage – design of service reservoirs and break tanks.
• Material compatibility – avoiding corrosion and contamination.
• Commissioning and maintenance – flushing, disinfection, and record keeping.