The Drinking Water Ordinance stipulates a regular sampling of the drinking water. If you receive a letter from the health department due to increased Legionella contamination (greater than 100 cfu / 100ml), it is necessary to have a hazard analysis done by an independent expert.
Potable water hazard analyzes
nach §16 Absatz 7 Nr.2 TrinkwV (7) gemäß UBA Empfehlung vom 14.12.2012
und Richtlinie VDI/BTGA/ZVSHK 6023 Blatt 2