DWI announces changes to water testing requirements

The Drinking Water Inspectorate (DWI) has announced changes to testing regulations for drinking water supplies.

Water companies and local authorities must ensure that the laboratories to which regulatory samples are submitted are appropriately accredited

Water companies and local authorities must ensure that the laboratories to which regulatory samples are submitted are appropriately accredited

The changes, which affect both public and private supplies, relate to the arrangements for demonstrating that the laboratory analysis of drinking water samples and associated reporting of analytical results, meet regulatory requirements.

In order to comply with the Water Supply (Water Quality) Regulations and the Private Water Supplies Regulations, samples must only be analysed by a laboratory that has in place a system of analytical control that is subject to checking by an approved body.

As the UK's National Accreditation Body, the United Kingdom Accreditation Service (UKAS) is the approved body for England and Wales.

Consequently, the DWI has instructed that all laboratories carrying out analysis of drinking water must obtain and maintain UKAS accreditation equivalent.

Accordingly, each water company and local authority must ensure that the laboratories to which regulatory samples are submitted are appropriately accredited.

Laboratories in England and Wales can seek a further specific scope of accreditation for a sector scheme known as the Drinking Water Testing Specification (DWTS). DWTS is already compulsory for laboratories undertaking testing of drinking water in Scotland and Northern Ireland.

Divisional director (Laboratories) at UKAS, Paul Greenwood, said: "Opting for accreditation under the DWTS scheme significantly reduces the burden of DWI audits, as the need for DWI to routinely audit or inspect the laboratory is removed.

"Conversely, if a laboratory chooses not to adopt DWTS they will be subject to risk based vertical audits, including audits of samplers, by DWI.

"From January 2013 onwards the costs of DWI audits or inspections of laboratories used by water companies will be recovered by the DWI, so there are also financial benefits to being accredited under the DWTS scheme."

Leigh Stringer


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