Skip to main content

The NSF REG4 Certification for the UK Helps Plumbing Products Show Compliance

The NSF REG4 certification scheme for the UK market allows plumbing products and materials to show compliance with the Water Supply (Water Fittings) Regulations 1999.

NSF REG4 Certification & The Regulators’ Specifications

All manufacturers selling water supply products into the UK must meet Regulation 4, a section in these regulations:

  • Water Supply (Water Fittings) Regulations 1999
  • The Water Supply (Water Fittings) (Scotland) Byelaws 2014
  • The Water Supply (Water Fittings) Regulations (Northern Ireland) 2009.

 NSF RG4 is your solution to meet the Regulators’ Specifications.

The scope of this certification scheme includes mechanical products in contact with drinking water, such as valves, backflow prevention devices, taps, mixers, shower heads, pipes and fittings, tanks, cisterns, water metres and many others. It also covers non-metallic products such as rubbers, coatings, cements, resins and sealants.

Click here to learn more

Ready To Begin the Process?

Contact us with questions or to receive a quote.

What’s New with NSF

  • NSF Issues First-Ever MSC Certification for an Eel Fishery to Perupez S.A.C. and Sakana del Peru

    June 19, 2026
    Third-party certification plays a key role in independently verifying the sustainability of seafood operations.
    Read the Story
  • Spritzer Becomes First Malaysian Bottled Water Brand Certified by NSF for Beverage Quality

    May 21, 2026
    The leading Malaysian bottled water and beverages brand has earned NSF certification from ANSI-Accredited Product Certification Body – Accreditation #0216.
    Read the Story
  • NSF Annual Review and Impact Report 2025 Now Live

    April 20, 2026
    NSF has published its Annual Review and Impact Report 2025, detailing the organization’s progress over the past year and outlining strategic priorities for 2026.
    Read the Story
  • Visit NSF at Making Pharma 2026

    April 10, 2026
    Connect with our experts to discover how we help leading pharmaceutical and biotechnology companies achieve regulatory compliance and operational excellence.
    Read the Story