The cities of Curuçá and Marapanim are located in the northeast of Pará, the most populous region of the state. They are important regions in the agricultural, fishing and tourism sectors and need a good quality water not only for economic development but also for the well-being of the population. As aquifers are large reservoirs of excellent natural quality, they become strategic alternatives for the supply of urban centers and small communities, such as those cities where both water distribution systems use exclusively groundwater. However, the mismanagement of this resource can lead to several problems, such as overexploitation of aquifers and contamination of them by anthropogenic agents. The present study used data from the Integrated Groundwater Monitoring Network (RIMAS) project delevoped by Geological Service of Brazil (CPRM) and aimed to evaluate the hydroenvironmental quality of Piraba’s acquifer in the region over three years of monitoring, from the concentration of dissolved anions and physico-chemical parameters. Five samples out of the six totals are within the quality standard established by CONAMA Resolution No. 396/2008 and Ministry of Health Ordinance No. 2.914 / 2011, with the exception of the Marapanim 2018 sample which presented values above the allowed for nitrate anion (11.44mg/L). A relationship between the rainy season of the year (November to June) and the apical values of anions such as nitrate, chloride and sulfate was observed. This may indicate, in light of the bibliographic survey conducted during the elaboration of this research, that during this period, the interaction between shallow (Barrier and Post Barrier) and deep (Pirabas) aquifers systems increases, also maximizing the risk of contamination, making the sustainable groundwater management nothing but essential to ensure the safety and well-being of its users.
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