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Private Water Supply Risk Assessment

The Private Water Supply (PWS) Regulations 2009, require water supplies other than those provided by a water undertaker to be ‘wholesome’ i.e. it does not contain any micro-organism (e.g. E.Coli), parasite (e.g. cryptosporidium, giardia) or substance (e.g. lead) at a concentration or value that would constitute a potential danger to human health.

Local authorities must carry out risk assessments every 5 years on such supplies and can impose a prohibition notice if such dangers may be present, noncompliance is an offence.

If you operate or consume from a PWS it will undoubtedly be a critical resource for you and it is imperative that you understand and manage the risks, to prevent potentially catastrophic health issues and possible reputational damage.


A private water supply is an extremely valuable resource, however they can be prone to dangerous natural contamination or their security can be deliberately compromised.

Zeta’s risk assessment service follows a similar methodology to that required of local authorities under the regulations and in line with Drinking Water Inspectorate (DWI) guidance covering the following areas;

• Management, schematics, procedures and records

• Assessment of water source

• Storage and distribution network issues

• Security of equipment and assets

If you need assistance with the private water supply risk assessments please contact us

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