A process for producing soap is provided, which includes effective microorganisms (EM) and EM-X ceramic powder, which are added to enhance the degree of saponification of fat, strengthen the cleaning power, and to provide a detergent that is capable of proliferating effective microorganisms in sewage water after washing and cleaning the sewage water, and which exhibits an effect as a water purification material after washing. Effective microorganisms (EM) including mainly facultative anaerobic lactic acid bacteria, yeast and photosynthetic bacteria and EM-X ceramic powder are added in the process of producing the soap, thereby, the treated material obtained according to the present invention exhibits an environmental purification effect as a substrate of benign microorganisms or a microorganism material.