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EVALUATION AND IDENTIFICATION OF SIGNIFICANT QUALITY PARAMETERS FOR THE BODIES OF WATER IN BAHIA’s SEMI-ARID REGION. CASE STUDY: SALITRE RIVER HYDROGRAPHIC BASIN. Objective of this work was identifying superficial water quality parameters, significant to semi-arid hydrographic basins, minimizing costs of water monitoring. The Salitre river basin, an important sub-basin of the Silo Francisco river, was used as a case study. STD, Cl(-), DO, BOD, pH, NO(3)(-), PO(4)(3-), Al, Cu, Fe, Mn, Ni and Pb were considered the most significant parameters, with concentration levels found in some stretches of the basin not compliant with the current legislation. Some of the Salitre river basin sediments may represent a risk to the quality of the water body in relation to levels of nickel and zinc.