PROBLEM TO BE SOLVED: To provide a method for judging the source district of raw water capable of accurately and efficiently calculating O of raw water used for producing brewed sake or blended sake, and to provide a system for judging the source district of raw water.SOLUTION: The system for judging the source district of raw water used for the production of brewed sake etc. is provided with an inputting part to input the O of the brewed sake etc. to be examined and an operation part to correct the inputted O of the brewed sake etc. to be examined to the O of the raw water used in the production of the brewed sake to be examined. The operation part corrects the O of the brewed sake etc. to be examined to the O of the raw water used for producing the brewed sake etc., to be examined based on the fluctuation of the O of the raw water from a specifed source district and the O in the case of producing the brewed sake etc. from the raw water of the specific source district calculated from the O of the brewed sake, etc., produced by using the raw water from the specified source district.
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