An extensive survey of groundwater quality was performed at the regional scale in peri-urban and industrial contexts of the Walloon Region (Belgium). To this end, 243 sampling locations from 8 areas located in different geological contexts and different peri-urban areas of the region were sampled outside pollution hotspots related to contaminated sites. Each groundwater sample was analyzed for 19 inorganic trace elements, 59 organic micro-pollutants and 8 major and minor elements. Five physico-chemical parameters were measured in the field, at the time of sampling to determine the environmental conditions prevailing in groundwater. Existing groundwater chemical data available outside such peri-urban and industrial areas were also compiled from existing groundwater quality databases for comparison. Most of the organic and inorganic pollutants are detected and their levels of occurrence are described statistically. Cumulative distribution function plots allow comparing the distributions of inorganic trace elements in and outside the urbanized and industrialized areas and among the different prevailing geological contexts. Two indicators are introduced, one quantifying the impact on inorganic trace elements of diffuse pollution in urban and industrial areas, the other reflecting the influence of lithology on concentrations in groundwater. Results show that the composition of groundwater is altered in peri-urban and industrial areas with increased concentrations for several organic pollutants and for most inorganic trace elements. However, the results clearly indicate that for the inorganic trace elements, anthropogenic influence is not limited to increased discharge of pollutants in the urban and industrial areas but also to significant changes in environmental conditions, with more reducing and acidic conditions observed in groundwater. The influence of lithology is also marked in the data set. From a more pragmatic point of view, the data set has been also used to derive upper limits of pollutant background concentrations to be used in decision-making related to the management of contaminated groundwater in urban and industrial environments in the Walloon Region.

在瓦隆地区（比利时）的郊区和工业环境下，在区域范围内对地下水质量进行了广泛的调查。为此，在与污染地点相关的污染热点之外，从位于不同地质背景和该地区不同城市周边地区的8个地区的243个采样点进行了采样。每个地下水样品分析了19种无机微量元素，59种有机微污染物和8种主要和次要元素。在采样时，在野外测量了五个理化参数，以确定地下水中普遍存在的环境条件。还从现有地下水质量数据库中收集了在郊区和工业区以外可用的现有地下水化学数据，以进行比较。大多数有机和无机污染物进行检测，并对其发生水平进行统计描述。累积分布函数图可以比较城市化和工业化区域内外的无机痕量元素分布以及不同的主要地质环境之间的分布。引入了两个指标，一个指标量化了城市和工业区中弥漫性污染对无机微量元素的影响，另一个指标反映了地下水浓度的岩性。结果表明，在郊区和工业区，地下水的组成发生了变化，其中几种有机污染物和大多数无机微量元素的浓度都在增加。但是，结果清楚地表明，对于无机微量元素，人为影响不仅限于城市和工业区污染物排放的增加，而且还包括环境条件的重大变化，在地下水中观察到更多的还原性和酸性条件。数据集中还标明了岩性的影响。从更务实的角度来看，