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Innumerable Nations are enduring biohazard complications because of potable Water contamination. Water contamination is due to the presence of heavy metals like Nickel, Lead, Mercury, copper, iron, manganese, Cadmium, and Zinc in ppb (parts per billion) level. The most effective MEMS-based cantilever design capable of detecting Mercury and Cadmium ionic pressures with better geometry is highly demanded. Heavy metal ion detection in the vapor phase at a particular temperature is highly recommended. The project primly proposes a comparative study of divergent MEMS-based micro-cantilever beam structures with an active layer coating for heavy-metal Mercury and Cadmium ion detection and the structures were appraised based on the mechanical displacement under the pressure influence of target ions. The project proposes a concernment study of the laminar flow of water (liquid) through divergent structural designs. The laminar flow characteristics of water are engaged to find the maximal and minimal velocity and pressure positions. On altering the Inlet flow rates; the outlet flow rate, maximal and minimal velocity and pressure positions vary. Laminar structures were appraised based on the variation of outlet flow rate and pressure with respect to inlet flow velocity. The MEMS-based micro-cantilever structure with superior mechanical displacement is lodged at a maximal pressure locus of laminar flow structures. The pressure quantification at the locus of the micro-cantilever structure is calibrated for Heavy metal: Mercury and Cadmium ions pressure concentration. The finite element analysis of heavy metal Mercury and Cadmium Ion detection is executed using COMSOL Multiphysics 5.4

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