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PALAVRAS-CHAVE:Qualidade das águas, águas superficiais, irrigação. ANALYSIS OF THE RISK OF SALINITY OF WATER NOT PERENIZED BY TRUSSU RIVER SUMMARY:The objective of this study was to evaluate the quality of irrigation water in the perennial section of the lower part of the Trussu river valley (24 km of river) in the municipality of Iguatu Ceará. For the monitoring, bimonthly campaigns were carried out to collect samples of water at five different points in the river. The parameters analyzed were: Electrical Conductivity of Water (EC); (Ca + 2); (Mg + 2); (K +); (Na +); (Cl-); (SO4-2); (HCO3 -) and 1 Graduanda em Tecnologia em Irrigação e Drenagem IFCE-Iguatu.