Accreditation reduces the need for regulatory audits and the associated costs
Accreditation of laboratories under the Drinking Water Testing Standard Scheme (DWTS) significantly reduces the burden of Drinking Water Inspectorate (DWI) audits, as the need for the Regulator 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 the DWI. The costs of DWI audits or inspections of laboratories used by water companies are recovered by the DWI, and so there are clear financial benefits of being accredited under the scheme.
Further information is available here.