As a result of high-quality source water and consumer preference, more than half of the utilities supplying water in Germany have not needed to use disinfection to comply with German Drinking Water Regulations (GDWR). Changed conditions, such as decreased consumption levels and, consequent decreased flow rates and increased temperatures, bring the risk of sudden violations of GDWR1. This paper examines strategies to deal with such risks and how to monitor water quality for bacterial regrowth events. Particular attention is paid to the part played by the age and condition of decade-old distribution pipes. It is shown that careful management of such distribution systems can prevent bacterial regrowth without chlorination.

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