MAL, or Maximum Allowable Limit, refers to the permissible concentration of cadmium in drinking water, which is crucial due to the metal's harmful effects on human health. The US Environmental Protection Agency (EPA) has established a limit of 0.005 mg/L for cadmium, indicating that even this minuscule amount is undetectable to the naked eye. Additionally, the World Health Organization (WHO) recommends an even lower limit of 0.003 mg/L. Understanding these limits is essential for ensuring safe drinking water and protecting public health from cadmium exposure.