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Rainwater Harvesting Installation Certificate

A Rainwater Harvesting Installation Certificate confirms that a rainwater collection and reuse system has been installed in compliance with BS 8515 and the Water Supply (Water Fittings) Regulations. It covers tank sizing, filtration, pump commissioning, backflow prevention, and pipework marking.

BS 8515:2009+A1:2013 (Rainwater harvesting), Water Supply (Water Fittings) Regulations 1999Valid: One-off (annual service recommended)

What it covers

  • Tank type, capacity, and location
  • Filtration and first-flush system
  • Pump commissioning and pressure tests
  • Backflow prevention (Type AA/AB air gap)
  • Pipework marking (non-potable)
  • Mains water backup connection

Who needs a Rainwater Harvesting?

Homeowners
Commercial building developers
Architects (BREEAM credits)
Local authorities

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Frequently asked questions about Rainwater Harvesting

Do I need Building Regulations approval for rainwater harvesting?
The plumbing aspects require compliance with the Water Supply (Water Fittings) Regulations. If the system involves changes to drainage, Building Regulations Part H applies. BREEAM-rated buildings often require rainwater harvesting for water credits.
Can harvested rainwater be used for drinking?
No. Unless treated to potable water standards, harvested rainwater must only be used for non-potable purposes such as toilet flushing, garden irrigation, and laundry. All pipework must be clearly marked as non-potable.

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