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The inspection of (collective) tap water installations in 2010 : Progress and results

De controle van collectieve leidingwaterinstallaties in 2010 : Controle watertechnische en prioritaire installaties [ Voortgang controletaak en resultaten ]


In most buildings, like schools, sports accommodations or offices, tap water installations provide clean drinking water to the consumer. Water quality problems in these installations can put consumers and the public mains system at risk. To prevent potential water quality problems, the drinking water companies perform inspections on the technical state and management of these installations.

Newly installed installations need second inspection:
The number of newly installed drinking water installations that comply with regulations at the first inspection in 2010 has decreased by 4% compared with previous years. After the inspection cycle (first and re-inspection), more installations (3%) comply compared with previous years. It is troubling that this occurs after the second inspection of the installation.

These conclusions are drawn from the inspections performed by the drinking water companies in 2010. By order of the Dutch Ministry of Infrastructure and Environment, the Institute for Public Health and Environment of the Netherlands (RIVM) collects and analyses the feedbackof these inspections in a yearly report since 2004. In 2010 almost 62,000 (first & re-) inspections were performed on more than 50,000 newly installed and existing tap water installations. The inspections have found and resolved more than 9,500 situations of high to very high risk for public health.

Inspection of existing tap water:
Existing tap water installations show a similar pattern; in 2010 fewer installations comply with regulations at first inspection. The number of installations with very high risk of contamination has remained stable compared to previous years.

Legionella prevention:
Installations that must comply with special regulations for the prevention of Legionella (high-priority installations like hotels, hospitals and saunas) must perform good management of the tap water installation. In 2010, there was a small increase in general in the number of priority installations that comply with these regulations compared to 2009. Only bed & breakfasts show a decrease of 6% in the number of installations that comply.

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