One of the most important factors in determining sites of aquaculture farming is water quality. The appropriate site with the best water quality must be identified in order to grow the finest quality of fish. However, choosing the best site for aquaculture farming cannot be done only based on one single parameter of water quality. Instead, a number of water quality parameters, such as pH and dissolved oxygen levels, should be considered during the selection process. Thus, this study employed the Elimination and Choice Translating Reality (ELECTRE) method to rank four potential sites for aquaculture farming with five parameters or criteria of water quality. Three decisionmakers who are professionals in aquaculture farming are invited to evaluate the rationality of the sites based on the considered criteria of water quality using real numbered linguistic terms. The eight computational steps of the ELECTRE method are applied in searching the optimal site. The findings show that site A4 dominates the other three sites, proving that the Marang River is the best site for aquaculture farming. The results of this study could be used by local department of fisheries in suggesting new sites for aquaculture farming