This study aims to assess the impact of agricultural reuse of treated wastewater; in particular, the risk of degradation that will occur throughout the entire growing cycle of a tomato crop \\\\\\\"Solanum lycopersicum\\\\\\\". The main objective is to verify the effects of treated wastewater on the growth and development of this plant. Two different irrigations were chosen, one using treated wastewater from the Chlef wastewater treatment plant and the other using Ground Water from the experimental station reservoir of the University of Hassiba Benbouali in Chlef, Algeria as control. Randomized Complete Block Design (RCBD) with five replicates was used. A first sample was taken at the stage (3, 5 and 7 leaves), flowering and fruiting. Tests were carried out on the growth parameters, as well as on the production parameters. A physico-chemical analysis of the treated wastewater was also carried out for the following parameters: pH, temperature, electrical conductivity, COD, BOD, ammonia, nitrate and nitrite. The results obtained showed that it does not appear to have a negative effect on the quality of the fruit. Finally, the physico-chemical analysis of treated wastewater showed that for most of the parameters studied, the data comply with international standards established by the FAO. \\\\nKeywords: Algeria, Irrigation, Tomato, Solanum lycopersicum, Treated wastewater

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