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Contamination in Ontario farmstead domestic wells and its association with agriculture - 1. Results from drinking water wells

Show simple item record Goss, M. J. Barry, D. A. J. Rudolph, D. L.
dc.coverage.spatial Ontario
dc.coverage.spatial Canada 2019-02-19T16:02:15Z 2019-02-19T16:02:15Z 1998 1998
dc.identifier.citation Goss, M.J., Barry, D.A.J., and Rudolph, D.L. (1998). Contamination in Ontario farmstead domestic wells and its association with agriculture: 1. Results from drinking water wells. Journal of Contaminant Hydrology. 32(3-4): 267-293.
dc.description.abstract Groundwater provides about 30% of water requirements in Ontario, but farm families depend almost entirely on private wells. Major potential contaminants on farms are nitrate (NO3-), pathogenic micro-organisms, pesticides and petroleum derivatives. A survey of farm drinking water wells was conducted throughout the Province of Ontario, Canada, in 1991 and 1992 and tested for these contaminants. Main objectives of the survey were to determine the quality and safety of drinking water for farm families, and determine the effect of agricultural management on groundwater quality at a provincial scale. Four farm wells were chosen in each township where >50% of the land area was used for agricultural production. Elsewhere one well per township was usually sampled. Within each township the types of farming activity and dominant soils were additional criteria for selection. The network comprised 1292 of the estimated 500,000 water-wells in Ontario, and the study conformed to a stratified random survey. A subset of 160 wells, chosen by farm type, soil, and the presence or absence of a fuel storage tank, was investigated for the presence of petroleum derivatives: benzene, toluene, ethyl benzene, and xylene. About 40% of farm wells tested contained one or more of the target contaminants above the maximum acceptable concentration
dc.description.abstract 34% of wells had more than the maximum acceptable number of coliform bacteria, 14% contained NO3- -N concentrations above 10 mg L limit and about 7% were contaminated with both bacteria and NO3-. Only six wells contained pesticide residues above the interim maximum acceptable concentration (IMAC), but pesticides were detected in 7% of wells in winter and in 11% in summer. No wells contained detectable petroleum derivatives. These results for NO3- contamination were not significantly different from those reported for a survey of Ontario wells for the period 1950-1954, but the frequency of contamination by Escherichia coli was greater in the present study. None of the point sources investigated contributed significantly to the NO3- contamination. The percentage of wells contaminated by coliform bacteria decreased significantly with increasing separation of the well from the feedlot or exercise yard on livestock farms. A full statistical model including the type of well construction, depth, age and soil hydrologic group was developed to describe the frequency of NO3- contamination.
dc.format pdf
dc.language.iso en
dc.publisher Elsevier
dc.subject nitrate
dc.subject wells
dc.subject groundwater
dc.subject drinking water
dc.subject farm
dc.subject contamination
dc.subject water quality
dc.title Contamination in Ontario farmstead domestic wells and its association with agriculture - 1. Results from drinking water wells
dc.type Report
dc.contributor.affiliation Centre for Land and Water Stewardship, University of Guelph
dc.contributor.affiliation Department of Earth Sciences, University of Waterloo

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