The authors describe two water-borne outbreaks of Campylobacter gastroenteritis that occurred in central Norway in 1994 and 1995. The epidemics were probably caused by contamination of drinking water by the stools of Pink-footed geese on the way from Svalbard to Germany-Netherlands. Campylobacter jejuni from the stools of the geese was transmitted to the population via untreated drinking water, causing disease in 50% of the population. About 1,000 persons suffered from gastroenteritis caused by contaminated drinking water in these two epidemics.