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A pollution event which occurred at a spring in the Arnside area of Cumbria provided an opportunity to investigate whether Campylobacter jejuni could be detected in groundwater. Hydrological evidence suggested that the source of contamination was a dairy farm situated within the hydrological catchment of the polluted spring. The microbiological quality of the polluted spring was monitored during intervals over the following 12 months and compared with others in the area. Campylobacter jejuni was isolated by filter enrichment of 500 ml and 100 ml filtered volumes of groundwater. It was not isolated in the absence of faecal indicator species. Some strains of Camp. jejuni from water had identical biotypes to strains isolated from the dairy herd. This paper reports the first isolation of Camp. jejuni from groundwater using cultural methods and supports the theory that groundwater may be a vehicle for Campylobacter transmission.