Drinking Water Ordinance
Inspection obligation: Drinking water facilities with large-scale systems for the heating of drinking water must be tested for Legionella. A drinking water heating system is considered to be a large-scale system if:
- the storage volume of the drinking water equipment is more than 400 litres or
- the water volume contained in at least one of the pipes between the outlet of the water heater and the furthermost point of use is more than 3 litres.
Systems in one- or two-family houses are not subject to the inspection obligation. Samples must be taken from representative points of use in the drinking water facilities at three-year intervals. Samples must be taken from at least three points:
- at the outlet of the drinking water heater,
- before re-entering the drinking water heater,
- at the furthermost point in each ascending pipe.
The sampling may only be performed by certified sampling personnel. The samples must be transported to an accredited laboratory for testing within 24 hours. Before sampling, the owner must ensure that suitable taps are installed at the sampling points.
Duty of disclosure and duty requiring action: In the case of positive results, the health authorities and the affected tenants must be informed without delay. Depending on the evaluation of the results, corresponding measures must be performed, which may be prescribed by the health authorities.
Duty to provide information: Tenants must be informed in writing on an annual basis about the quality of their drinking water based on the test results. The individual aspects of the inspection processes, all implemented measures and the determined results must be documented and kept available for ten years. Our complete service for all aspects regarding Legionella relieves your burden with fulfilling your legal duties.