The resistivity data was obtained to estimate the pore water resistivity at De Paardenmarkt ammunition dump site and to detect zones of fresh submarine groundwater discharge (FSGD). The dataset was taken by the UGent Laboratory of Applied Geology and Hydrogeology. By means of the Syscal Pro Deep Marine - with a floating cable, using the reciprocal Wenner-Schlumberger protocol and a spacing of 10m between the 13 take-outs - the apparent bulk resistivity of the seabed was measured. On land, the multiple gradient array was used, with a spacing of 5m between the electrodes. A shapefile of the profile locations are included, as wells as, the original measurements (*.bin). The data file (*.dat) was inverted (*.inv) with the RES2DINV software providing an inversion model (see *.jpeg and *.xyz). This model can also be imported in Surfer using the grid and *.bln files (the *.lvl file provide the correct colour scale).