The objective of this study is to evaluate the parasitological and bacteriological qualities of the soil and water of the Oued Larbaâ, through nine stations covering the part of the Oued crossing the Taza city of Morocco (7 km of length). This study was conducted during two dry periods (2017 and 2018) and one wet period (2018). Soil parasitological studies revealed high contamination by helminths belonging to the species Enterobius vermicularis and Toxocara sp., which recorded the highest concentrations in stations S2 and S8, respectively, with values of 11.41 and 29.26 eggs/g. Concerning water, the majority of stations indicated contamination mainly by Ascaris lumbricoides, which reached concentrations of 56.49, 37.39, and 56.15 eggs/l in stations S3, S6, and S8, respectively. Bacteriological examination of the soil showed very high concentrations of bacteria, especially Streptococcus, due to the high retention of this type of bacteria in the soil. The water analysis indicated that stations S3, S4, and S8 are the most impacted, with total coliform and Streptococcus concentrations in station S3 of 2.45 10⁵ and 0.20 10⁷ CFU/ml, respectively, Fecal coliforms and Staphylococci are detected in high concentrations in station S8 with values of 1.35 10⁴ and 8.92 10⁶ CFU/ml, respectively, and total aerobic mesophilic flora in station S4 with a concentration of 1.89 10⁹ CFU/ml. During the study periods, influences of sampling season, nature of discharge existed (wastewater or leachate) on the parasitological and bacteriological composition of the river were established with high concentrations during the dry period and in the stations in which large amounts of liquid discharge were observed.

本研究的目的是通过涵盖穿越摩洛哥塔扎市（7 公里长）的 Oued 部分的 9 个站点评估 Oued Larbaâ 土壤和水的寄生虫学和细菌学质量。这项研究是在两个干旱期（2017 年和 2018 年）和一个湿润期（2018 年）进行的。土壤寄生虫学研究表明，蠕虫属蠕虫和弓蛔虫属的蠕虫污染严重，它们分别在 S2 和 S8 站的浓度最高，分别为 11.41 和 29.26 个卵/克。关于水，大多数站点表示主要受蛔虫污染，在 S3、S6 和 S8 站分别达到 56.49、37.39 和 56.15 个鸡蛋/升的浓度。土壤的细菌学检查显示细菌浓度非常高，尤其是链球菌，因为这种类型的细菌在土壤中的保留率很高。水质分析表明，S3、S4和S8站受影响最大，S3站总大肠菌群和链球菌浓度分别为2.45 10 ⁵和0.20 10 ⁷  CFU/ml，粪便大肠菌群和葡萄球菌检测到高浓度站 S8，值为 1.35 10 ⁴和 8.92 10 ⁶ 分别为 CFU/ml 和 S4 站的总需氧嗜温菌群，浓度为 1.89 10 ⁹  CFU/ml。在研究期间，采样季节、存在的排放性质（废水或渗滤液）对河流寄生虫学和细菌学组成的影响在枯水期和观察到大量液体排放的站点中以高浓度确定.