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An efficient porous adsorbent for arsenic is developed from abundantly available laterite using an optimized acid followed by base treatment methodology. XRD, HRTEM, surface area analyzer and FTIR are used to characterize the treated laterite (TL). Arsenic adsorption capacity of TL is evaluated under varying process conditions in batch mode using synthetic solution of single arsenic species, mixture of both As(III) and As(V) species and real arsenic contaminated groundwater (CGW). The effects of competitive ions like phosphate, silicate, carbonate, etc., on arsenic adsorption using TL are explored in details. Langmuir isotherm is found to be a better fit of the experimental isotherm data of arsenic/TL system. The Langmuir maximum adsorption capacity and constant related to adsorption energy for As(V) and As(III) on TL are found to be 21.6±0.8mg/g, 20.6±0.5L/mg and 9.4±0.4mg/g, 5.0±0.1L/mg, respectively. The …