Int. J. Environ. Res. Public Health 2013, 10(3), 845-855; doi:10.3390/ijerph10030845
Article

Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems

1 DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kgs. Lyngby, Denmark 2 VCS Denmark, Vandværksvej 7, 5000 Odense C., Denmark
* Author to whom correspondence should be addressed.
Received: 9 January 2013; in revised form: 15 February 2013 / Accepted: 19 February 2013 / Published: 1 March 2013
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Abstract: Individuals of the water louse, Asellus aquaticus, enter drinking water distribution systems in temperate parts of the world, where they establish breeding populations. We analysed populations of surface water A. aquaticus from two ponds for associated faecal indicator bacteria and assessed the risk of A. aquaticus transporting bacteria into distribution systems. Concentrations of up to two E. coli and five total coliforms·mL−1 were measured in the water and 200 E. coli and >240 total coliforms·mL−1 in the sediments of the investigated ponds. Concentrations of A. aquaticus associated bacteria never exceeded three E. coli and six total coliforms·A. aquaticus−1. During exposure to high concentrations of coliforms, concentrations reached 350 coliforms·A. aquaticus−1. A. aquaticus associated E. coli were only detected as long as E. coli were present in the water and sediment. The calculated probability of exceeding drinking water guideline values in non-disinfected systems by intrusion of A. aquaticus was low. Only in scenarios with narrow pipes and low flows, did total coliforms exceed guideline values, implying that the probability of detection by routine monitoring is also low. The study expands the knowledge base for evaluating incidents with presence of coliform indicators in drinking water by showing that intruding A. aquaticus were not important carriers of E. coli or other coliform bacteria even when emerging from faecally contaminated waters.
Keywords: asellids; fresh water; indicator organisms; invertebrate; microbial; water louse

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MDPI and ACS Style

Christensen, S.C.B.; Arvin, E.; Nissen, E.; Albrechtsen, H.-J. Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems. Int. J. Environ. Res. Public Health 2013, 10, 845-855.

AMA Style

Christensen SCB, Arvin E, Nissen E, Albrechtsen H-J. Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems. International Journal of Environmental Research and Public Health. 2013; 10(3):845-855.

Chicago/Turabian Style

Christensen, Sarah C.B.; Arvin, Erik; Nissen, Erling; Albrechtsen, Hans-Jørgen. 2013. "Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems." Int. J. Environ. Res. Public Health 10, no. 3: 845-855.

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