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Enzyme based electrochemical detection method developed for chemical toxicant ethanolamine (EA). Monoamine oxidase A (MAO‐A) enzyme was used for the oxidation of EA. A direct electron transfer from the electrode to EA without any mediator with the help of MAO‐A enzyme was attained and this confirms the application of this methodology for the development of third generation biosensor for EA sensing well below the IDLH (30 ppm) value of EA. Moreover, heterogeneous rate constant (0.021s−1) and the number of electron involved (5.2) were deduced for EA in PBS buffer. The calibration plot showed linearity 2.02×10−4 M to 10.10×10−4 M of EA in PBS buffer with detection limit 4.1 ppm. The modified electrodes are characterized by Raman and Electrochemical impedance spectroscopy (EIS) techniques. The outcome of this work indicates about the utility of this methodology for the sensing of EA in the environment if it is present as well as to degrade EA into other compounds without using any indicator or mediator.