DISCLOSED ARE A METHOD FOR DECREASING 3-CHLORO-1,2-PROPANEDIOL (HEREINAFTER, ‘3-MCPD’) FORMING SUBSTANCES (HEREINAFTER, ‘3-MCPD-FS’) GENERATED IN REFINING EDIBLE OIL, AS WELL AS THE EDIBLE OIL CONTAINING DECREASED 3-MCPD-FS. MORE PARTICULARLY, A METHOD FOR REDUCING A CONCENTRATION OF 3-MCPD-FS TO 0.3 PPM OR LESS BY CONTROLLING CHLORINE IONS CONTAINED IN TAP WATER USED FOR EDIBLE OIL REFINEMENT IS PROVIDED, THEREBY GREATLY DECREASING THE CONTENT OF 3-MCPD-FS, COMPARED TO TYPICAL EDIBLE OIL KNOWN IN THE RELATED ART. SIMULTANEOUSLY, THE PRESENT INVENTION ATTAINS EXCELLENT EFFECTS OF PROVIDING EDIBLE OIL THAT HAS IMPROVED RELIABILITY AND SAFETY TO CONSUMERS, WHILE RETAINING HIGH QUALITY THEREOF SUCH AS TASTE, COLOR, ETC. (FIGURE 1)
