Reg 4 and Reg 31 — More Than Just Specification Language

In the UK water industry, Regulation 4 and Regulation 31 are part of the background noise of every project: cited in specifications, framework agreements and tender documents almost without thinking. Yet for manufacturers, they represent something far more consequential than technical shorthand. They shape how products are designed, tested, costed and ultimately trusted.

Securing approval is rarely straightforward. Testing programmes are rigorous, expensive and often repeated across product sizes or material variants, with even small design changes potentially triggering reassessment. But responsible manufacturers pursue approval anyway, because it removes uncertainty for customers and demonstrates that products can withstand not just installation, but decades of service in contact with drinking water.

Approval routes under Reg. 4 - whether via WRAS, KIWA or NSF — provide that reassurance. WRAS remains the most widely recognised, yet confusion persists around what constitutes approval and how the schemes relate to one another. At the same time, lower-cost alternatives that appear similar but lack formal approval continue to circulate in the market, particularly where procurement pressure is intense.

Within the supply network, Reg. 31 approvals overseen by the Drinking Water Inspectorate provide a further safeguard that materials and products do not compromise water quality from source to consumer. The framework is robust but its effectiveness depends on consistent understanding and application across the whole supply chain. At Groundbreaker Systems, we see compliance not as a hurdle but as part of our responsibility as suppliers to critical national infrastructure. Independent approval is not simply a gateway to contracts; it is evidence that the right questions have been asked long before a product reaches site.

Because in the end, compliance is not about certificates or logos. It is about ensuring that every component - seen or unseen - protects the safety, quality and reliability of the water people depend on every day.

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