In rural areas, groundwater contamination by nitrates is a problem related to the spreading of organic and chemical fertilizers by farmers and, to some extent, to effluents from domestic sewage systems.
Health effects of groundwater contamination by nitrates have been assessed several times and may lead to important consequences for infants.
Following pressures from citizens in 1990, a survey of well water quality around potato fields of the Portneuf county (Québec) found that nitrate contamination was frequently above the 10 mg-N/I standard.
Because this first survey was limited to areas of intensive potato culture, it was not possible to evaluate the real impact on the groundwater quality for the whole county and the subsequent public health intervention was spread over the entire region.
A second survey was carried out in 1995 to reevaluate the situation using random sampling methods.
This latter study took into account drinking water habits of the population, the relative importance of potato culture as a source of nitrogen loading, the effects of soil types, and waste-water disposal systems as well as land use on nitrate concentration in private well water.
The data analysis was carried out by combining GIS and statistical methods to test hypotheses about the spatial relationship linking measured nitrate concentrations with their immediate environment. (...)
Mots-clés Pascal : Québec, Canada, Amérique du Nord, Amérique, Pollution eau, Eau souterraine, Nitrate, Agriculture, Pomme de terre, Plante légumière, Sol sableux, Eau potable, Contrôle, Qualité eau, Système information géographique, Analyse statistique
Mots-clés Pascal anglais : Quebec, Canada, North America, America, Water pollution, Ground water, Nitrates, Agriculture, Potato, Vegetable crop, Sandy soil, Drinking water, Check, Water quality, Geographic information system, Statistical analysis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0430200
Code Inist : 001D16A02. Création : 25/01/1999.