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¹ Akdeniz Üniversitesi Ziraat Fakültesi Toprak Bilimi ve Bitki Besleme Bölümü, Antalya DOI : 10.16882/derim.2020.613100 Viewed : 2124 - Downloaded : 939 This study was carried out to determine the irrigation water quality, and to investigate the seasonal changes of irrigation water in Muğla-Dalaman region. For this purpose, 3 locations (Kapıkargın, Gürköy and Atakent) were determined and 54 water samples were taken in October-November 2017 (1^st period), February-March 2018 (2nd period) and May-June 2018 (3rd period). pH, EC, Ca⁺², Mg⁺², Na⁺, K⁺, CO₃^-2, HCO₃-, Cl- and SO₄^-2 analyzes were performed, sodium absorption rate (SAR) and Na% values were calculated. It was determined that the pH values of the samples ranged from 6.87 to 8.41; EC values from 523 to 7990 μS cm^-1; SAR values from 0.09 to 12.37 me L^-1; Na values from 1.58 to 56.58%; Cl- from 0.08 to 72 me L^-1; SO₄ contents from 0.38 to 29.38 me L^-1 and RSC values from -51.32 to 29.38 me L^-1. The pH values generally showed slightly alkaline and alkaline reactions; it was determined to classified as C₂ (medium) and C₃ (high) salinity, and EC values increased from 1^st period to 3^rd period. It was determined that SAR and Na values were in the 1^st and 2^nd class and decreased from 1st to 3^rd period. When evaluated in terms of locations, it was seen that the most problematic location of the irrigation waters taken in terms of EC, SAR, Na%, Cl-, SO₄^-2 was Kapıkargın. As a result, it was determined that most of the irrigation waters are problematic in terms of EC and should not be used in agricultural production, if necessary, necessary precautions should be taken, but they do not have any problems in terms of Na% and Cl-. Keywords : Irrigation water; Electrical conductivity; SAR; Na %; Dalaman