Three stochastic sensors based on modified nanocarbon paste (nC), nanographene paste (nGr), and reduced graphene oxide paste (rGOx) with 2, 2-diphenyl-1-picrylhydrazyl (DPPH) were proposed for the pattern recognition of bisphenols A (BPA), F (BPF), and Z (BPZ) in waste water samples. The linear concentration ranges recorded were: for BPA between 1fmol/L and 10 mu mol/L, for BPF between 10fmol/L and 1 mu mol/L, and for BPZ between 10fmol/L and 0.1mmol/L. The lowest limits of determination for each bisphenol were as following: 1fmol/L for BPA when the stochastic sensor based on nC was used, 10fmol/L for BPF when the stochastic sensors based on nC, nGr, and rGOx were used, and for BPZ 10gmol/L when the sensor based on nGr was used. The recoveries of the BPA, BPF, and BPZ were higher than 98.00% with relative standard deviation less than 0.20% (N = 10). (C) 2019 The Electrochemical Society.