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 meters and many others. It also covers non-metallic products such as rubbers, coatings, cements, resins and sealants.
Ready To Begin the Process?
Contact us with questions or to receive a quote.
What’s New with NSF
NSF Launches Protocol 549 for Glyphosate Reduction Claims
October 14, 2026P549 is the first standard globally that validates glyphosate reduction performance of water filtration systems and products.
Cambium Analytica, an NSF Company, Opens New Lab in Traverse City, Mich
October 6, 2026Ribbon cutting debuts innovative 15,000-square-foot testing facility to support evolving needs of the food & supplement industries.
NSF Drives Industry Conversations at SupplySide Global 2026 - Las Vegas, Oct. 26–30
September 17, 2026NSF returns to SupplySide Global with expert-led training and trusted certification solutions. Visit Booth 4741 to discover how NSF and Cambium Analytica help brands build trust, increase consumer confidence and stand out in a competitive marketplace.
NSF Welcomes Hanjun Kwon, Managing Director, APAC
September 14, 2026Experienced business leader to drive sustainable growth, organizational development and operational excellence across the Asia-Pacific region.