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Water meters


As of the 30 October 2006, all new designs of water meters that are to be used for legal purposes require certification under the measuring instruments directive (MID) 2004/22/EC. This applies to both electronic and mechanical water meters which are intended for the measurement of volumes of clean, cold or heated water in residential, commercial or light industrial use. N.B. in the UK, only the supply of cold water to domestic premises is controlled.

The MID provides manufacturers with access to the whole European market, with only one approval certificate required. Annex MI-001 of the MID is applicable to water meters and it provides manufacturers with a number of conformity assessment options. NMO is a notified body for type examination and design examination (Module H1) under this directive. For the full range of conformity assessment options that are offered by NMO.

NMO can convert existing UK national or EEC certificates into MID certificates. In addition, NMO can also convert existing type approvals issued by another European approval body into MID approvals.

NMO is an issuing participant under the OIML mutual acceptance arrangement (MAA) for OIML R-49 . OIML R-49 certificates and test reports will be accepted by utilising participants and may also be accepted by other countries who have not yet signed up to the MAA.

If you are unsure if your water meter will satisfy the requirements for certification, NMO offers a pre-assessment service which you can use prior to submitting an application for certification.

For further information on the certification of water meters, please contact Gavin Stones on +44 (0)20 8943 7294 or Stephen Bruce on +44 (0)20 8943 7275.

Apply online for Product Certification

Apply online for Pre-Assessment

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