“In the event of improper or missing maintenance, after the corona break there could have been an increased growth of these bacteria in drinking water systems”, writes the RKI in the "Epidemiological Bulletin".
In order to maintain proper operation, it is extremely important to regularly take water from your drinking water installation (flushing the pipe). To do this, all tapping points (taps, showers, ...) should be opened at least once a week, or better every 72 hours, until the warm water is constantly warm and the cold water is constantly cold. Both lines are separated from each other, in order hot water and cold water are flushed. If it is not possible for you to maintain normal operation, an interruption in operation is advisable. In this case, other measures must be taken: https://www.dvgw.de/medien/dvgw/covid19/dvgw-information-trinkwasser-installation-coronavirus.pdf.
Even after a few weeks of stagnation, significant microbiological contamination can occur in the water pipes. After 6 months of interruption of the water supply at the latest, microbiological examinations of both cold and warm water must be carried out before restarting. Even after shorter shutdowns, it may be advisable to have the microbiological status of your drinking water installation determined so that you can offer impeccable drinking water quality when your facility is reopened. Before restarting your drinking water system, you should therefore ensure that it is working properly. The working group for legionella infections of the European Society for Clinical Microbiology and Infectious Diseases (ESCMID) emphasizes the importance of testing drinking water for legionella.
Institut Kirchhoff GmbH will be happy to check whether your drinking water continues to meet the requirements of the Drinking Water Ordinance for the "restart". We are also available for consultancy and offer you timely appointments for water tests. Our range of services includes the analysis of various types of water (drinking water, bathing pools, industrial water, etc.) including accredited sampling and assessment of results.