Cost of Water Treatment Systems
across the UK

# Water Treatment Systems Accreditation Guide

The main UK regulatory bodies and trade associations overseeing water treatment systems include the Water Regulations Advisory Scheme (WRAS), which certifies products and installers to ensure compliance with the Water Supply (Water Quality) Regulations 2016, and the British Standards Institution (BSI), which validates systems against BS 6920 and other relevant standards. The Chartered Institution of Building Services Engineers (CIBSE) also provides guidance and accreditation for water systems design and installation. For chemical treatment, the British Chemical Distributors' and Traders' Association (BCDTA) sets standards for water treatment chemicals. Understanding these certifications matters because they confirm that a provider has been independently assessed, that their products meet safety and performance standards, and that their installation practices protect both your water quality and your property's plumbing system.

To verify a provider's credentials, ask for their WRAS certification number or BSI registration and check it directly on the relevant scheme's website rather than relying on marketing materials alone. Reputable companies will display their accreditation clearly and provide documentation without hesitation. You can also check membership of trade bodies such as the Water Cooler Association or relevant professional institutions. It is worth verifying because unaccredited installers may not understand current water safety regulations, which could lead to contamination risks, system failures, or invalidation of your building insurance and warranty. Additionally, accredited providers are bound by codes of conduct and dispute resolution procedures, offering you legal recourse if things go wrong.

Accredited water treatment providers typically charge 15 to 30 percent more than unaccredited alternatives, reflecting the costs of certification, ongoing compliance monitoring, and professional indemnity insurance. While this represents a genuine premium, it is usually justified because you gain assurance that the system will function safely and effectively, that installation meets Building