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The Canadian goldenrod Solidago canadensis (L) is an invasive species in Poland. It occurs both in habitats only weakly impacted by anthropogenic factors as well as in habitats subjected to intensive transformations by humans. The aim of this study was to characterise the habitats of S. canadensis in Mińsk Mazowiecki and in out-of-town areas. It has been shown, based on an analysis of the principal soil properties, that the sites where S. canadensis was found had clayey-sandy soil and a C/N ratio indicative of medium and high soil degradation. Canadian goldenrod was found at sites with a diverse content of phosphorus, calcium and magnesium in soil, as well as a diverse soil pH, indicative of a strongly acidic, acidic and alkaline character of the soil.

Nitrate in groundwater may come from point sources such livestock facilities, sewage disposal systems, including septic tanks and non-point sources such as fertilized cropland, or naturally occurring sources of nitrogen [Sapek 2004; Sądej and Przekwas 2006; WHO 2008]. Unlike water from deep wells located in rural areas which is supplied by distribution systems, water in household wells is particularly prone to NO 3 pollution [

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