Influence of Stagnation and Temperature on Drinking Water Quality

Press/Media: Public Engagement Activities

Period13 Sep 2017

Media coverage


Media coverage

  • TitleInfluence of Stagnation and Temperature on Drinking Water Quality
    Degree of recognitionInternational
    Media name/outletWater Canada; the complete water magazine
    Media typeWeb
    Duration/Length/Size1 pag
    DescriptionA group of Dutch researchers has completed a study on the plumbing between the water meter and consumer’s taps to determine whether stagnation and temperature may affect water quality.

    “Our conclusion was that the microbial quality of drinking water changes during the overnight stagnation, and that change appears to be driven by the temperature of fresh water (coming from water mains),” said Ljiljana Zlatanović, lead author of the study.

    The research was conducted using an experimental plumbing rig that simulated a two-storey house with two sets of stagnation experiments—during winter and summer months—with various stagnation intervals (up to 168 hours of stagnation). Water and biofilms were sampled at two different taps in the drinking water: a kitchen and a shower tap. Zlatanović explained that the results of the study were somewhat surprising.

    “The main conclusion of previous research was that the overnight stagnation of water in domestic drinking water systems promotes the microbial growth in stagnant water. [...] Even though nothing should be a surprise while conducting an experimental research, at the moment when we started getting the results that were different than those reported in previous studies, yes, we were kind of surprised,” she said.

    The research contradicts the previously drawn conclusions about the microbial quality of drinking water is not applicable if the temperature of freshwater is higher than a certain threshold; for example, during the summer months.
    PersonsL. Zlatanovic