One of the main risks associated with wildfires is the affection of superficial and groundwater resources. There are numerous disturbances that occur both in the quantity and the quality of the water resources. From this perspective, possible alterations that have occurred in the groundwater chemical composition have been evaluated as a result of the Peñuelas forest fire (or wildfire), occurred in Moguer (Huelva) in June 2017, affecting large areas of the Natural area of Doñana (END). With this aim, during the period 2017-2018, a monthly hydrochemical sampling campaigns were carried out for 21 points (wells, boreholes, springs and lagoons) located inside and outside the fire perimeter. The results obtained in this work show in general a slight increase of electrical conductivity and pH, as well as high contents of iron, manganese, aluminum and silica. However, there are no significant changes in magnesium contents, with some exceptions, just as it was observed in other case studies. Finally, the behavior of other minority elements is being analyzed, paying special attention to the content in Zn, and Se. These elements could be used, individually or in combination with other parameters, as indicators of the impact of the wildfires on the groundwater quality.