Since 2003 the (German) Drinking Water Directive stipulates that central hot water systems have to be tested for the microbiological parameter Legionella spec. No more than 100 colony-forming units (100 CFU) of those bacteria should be present in 100 ml of drinking water; otherwise further (technical) measures to reduce the contamination are mandatory. But what exactly are Legionella?
In the proceedings of the dominating covid19 pandemic industrial, commercial and private buildings had to be shutdown to avoid the spread of the corona virus The German Robert-Koch-Institute (RKI) warned not to neglect the health hazards coming from drinking water installations in terms of legionella growth if the facilities are out of operation for a longer period of time. We took a look at our own set of drinking water data all gathered in corona-times - with surprising results.
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