Tarja Pitkänen,^* Päivi Karinen,^** Ilkka T. Miettinen,^*** Heidi Lettojärvi,^**** Annika Heikkilä,^***** Reetta Maunula,^****** Vesa Aula,^******* Henry Kuronen,^******** Asko Vepsäläinen,^********* Liina-Lotta Nousiainen,^********** Sinikka Pelkonen,^*********** Helvi Heinonen-Tanski<sup>************


*</sup>Tarja Pitkänen () is a researcher and an expert of water microbiological methods at the Water and Health Unit of National Institute for Health and Welfare in Finland. She is finalizing her PhD involving studies on the detection methods of Campylobacter and faecal indicator bacteria in drinking water to Department of Environmental Science, University of Eastern Finland. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. Address: Department of Environmental Health, National Institute for Health and Welfare, P.O. Box 95, 70701 Kuopio, Finland. e-mail: tarja.pitkanen@thl.fi
^**Päivi Karinen is involved with studies of water quality and is a PhD student at the Department of Environmental Science, University of Eastern Finland. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. e-mail: paivi.karinen@uef.fi
^***Ilkka T. Miettinen is a head of the Water and Health Unit at National Institute for Health and Welfare. He is engaged with all fields of microbiological and chemical drinking water safety. Address: Department of Environmental Health, National Institute for Health and Welfare, P.O. Box 95, 70701 Kuopio, Finland. e-mail: ilkka.miettinen@thl.fi
^****Heidi Lettojärvi was a researcher at the Department of Environmental Sciences, University of Kuopio (currently University of Eastern Finland) during the empirical phase of this study. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. Address: ÅF-Consult Oy, P.O. Box 61, 01601 Vantaa, Finland. e-mail: heidi.lettojarvi@afconsult.com
^*****Annika Heikkilä was a Master's student at the Department of Environmental Sciences, University of Kuopio (currently University of Eastern Finland) during the empirical phase of this study. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. Address: Haapaveden kaupunki, Anttilantie 6,92620 Piippola, Finland e-mail: annika.heikkila@haapavesi.fi
^******Reetta Maunula was a Master's student at the Department of Environmental Sciences, University of Kuopio (currently University of Eastern Finland) during the empirical phase of this study. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland.
^*******Vesa Aula was a Master's student at the Department of Environmental Sciences, University of Kuopio (currently University of Eastern Finland) during the empirical phase of this study. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland.
^********Henry Kuronen is a veterinarian and he works as an expert of veterinary bacteriology at the Finnish Food Safety Authority Evira. Address: Research Department, Finnish Food Safety Authority Evira P.O. Box 92, 70701 Kuopio, Finland. e-mail: henry.kuronen@evira.fi
^*********Asko Vepsäläinen is a statistician at the Department of Environmental Health, National Institute for Health and Welfare. Address: Department of Environmental Health, National Institute for Health and Welfare, P.O. Box 95, 70701 Kuopio, Finland. e-mail: asko.vepsalainen@thl.fi;
^**********Liina-Lotta Nousiainen worked as a microbiologist at Veterinary Bacteriology, Research Department, Finnish Food Safety Authority Evira during the empirical phase of this study. Address: Research Department, Finnish Food Safety Authority Evira, P.O. Box 92, 70701 Kuopio, Finland.
^***********Sinikka Pelkonen is a professor and a head of Veterinary Bacteriology, Research Department, Finnish Food Safety Authority Evira. Address: Research Department, Finnish Food Safety Authority Evira, P.O. Box 92, 70701 Kuopio, Finland. e-mail: sinikka.pelkonen@evira.fi
^************Helvi Heinonen-Tanski is a senior lecturer in a field of environmental microbiology at the Department of Environmental Science, University of Eastern Finland. She has studied enteric microbes in animal slurries and in waters. Address: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. e-mail: helvi.heinonentanski@uef.fi