Standard methods for the detection of carbamate pesticides are expensive, time-consuming, and require highly trained employees. Thus, electroanalytical methods are considered to be rapid, simple and low-cost alternatives. Here, we develop sensitive voltammetric methods for the determination of methomyl (a carbamate pesticide) using a bare boron-doped diamond electrode, square wave voltammetry (SWV), differential pulse voltammetry (DPV) and Britton-Robinson buffer (pH 2.0) as supporting electrolyte. Methomyl has three oxidation processes: meantime process P-1 was chosen for the analytical determination due to its higher sensitivity in comparison with other processes. The detection limits and concentration ranges of the SWV and DPV methods were 1.9 x 10(-5) and 1.2 x 10(-6) mol L-1, and 6.6-42.0 x 10(-5) to 5.0-410.0 x 10(-6) mol L-1, respectively. The proposed methods were successfully applied in river water, tap water and commercial formulations showcasing >80% mean recoveries. Comparing the two techniques, DPV was seen as the most sensitive method. Published by Elsevier B.V.