Due to climate change and declining water resources, some farmers are turning to wastewater. One of water pollutants is household detergent. To examine this, a study was conducted to determine the effect of water contaminated with hand washing liquid on the germination characteristics of wheat, flax, and lentil in a completely randomized design with three replications in 2020. Experimental treatments included water contaminated with different concentrations of hand washing liquid ((0, 0.01, 0.1, 1, and 10)%) of hand washing liquid in water). The results showed that with increasing concentration of the contaminant in the water, the germination percentage, the caulicle length, and the radicle length of wheat, flax and lentil decreased. It was observed that wheat had a higher resistance to hand washing liquid than lentil and flax so that at a concentration of 0.01% and 0.1%, the wheat radicle was still growing. It is recommended to avoid irrigating plants with contaminated water with high amounts of hand washing liquid.