Data set associated to the publication "Chemotaxis under flow disorder shapes microbial dispersion in porous media". It includes the following: i) images of bacterial distribution in a microfluidics porous medium replica while displaced by a continuously injected front of a solute triggering microbial chemotaxis towards positive gradients (attractant). ii) images of bacterial distribution in a microfluidics porous medium replica while displaced by a continuously injected front of a solute triggering microbial chemotaxis towards negative gradients (repellent). iii) images of a continuously injected front of fluorescent tracer. iv) images of a chemotaxis assay to characterize positive/negative chemotaxis towards/from a chemoattractant/repellent: no flow conditions, steady and homogeneous chemical gradient.