The Rio do Campo and Rio Km 119 rivers are under constant human pressure. Thus, it is necessary to assess the adverse effects caused by waters of these rivers to living organisms. Phytotoxicity and enzymatic modulation of waters from eight sites was evaluated against Lactuca sativa L.—five located in Rio do Campo (P1, P2, P3, P4, and P5) and three located in Rio Km 119 (P6, P7, and P8)—strategically making up the surroundings of Campo Mourão. For every site, two samplings were made in 2019, one during the dry season (first sampling) and another during the rainy season (second sampling). Waters from P2 and P8, collected in the dry season reduced the seed germination rate. With the exception of P7 in sampling 1, waters from the other sites, in both seasons considered, significantly inhibited radicle elongation. In the dry season, there was an increase in CAT activity, mainly in roots exposed to waters from P3 and P7. In the rainy season, there was a reduction in the activity of this enzyme in roots, caused by waters from P1, P2, P4, P6, and P7. Except for P3 in the first sampling, roots exposed to waters from the eight sites, in samplings 1 and 2, had inhibition in SOD activity. Therefore, waters from the eight sites caused significant phytotoxicity and oxidative stress to L. sativa. These results complement and corroborate studies to assess the toxicity of waters of the Rio do Campo and Rio Km 119 rivers present in the literature. The imminent intervention of the public management of Campo Mourão and of the State government is necessary in the urban and agricultural human activities carried out in these springs, given the significant degradation and putting the survival of different species at risk.

里约热内卢和坎普河119条河流一直承受着人类的压力。因此，有必要评估这些河流的水对生物的不利影响。评价了八个地方的水对紫草的植物毒性和酶促调节作用L.-五个位于里奥多坎波（P1，P2，P3，P4和P5），三个位于里奥Km 119（P6，P7和P8）-从战略上构成了CampoMourão的周围。对于每个站点，在2019年进行了两次采样，一次在干旱季节（第一次采样），另一次在雨季（第二次采样）。在干旱季节收集的P2和P8中的水降低了种子发芽率。除了采样1中的P7外，在两个季节中，其他地点的水均显着抑制了胚根的伸长。在干旱季节，CAT活性增加，主要是在暴露于P3和P7水的根中。在雨季，由于P1，P2，P4，P6和P7中的水，这种酶在根部的活性降低。除了第一次采样中的P3之外，根部都暴露于八个地点的水域中，在样品1和2中，SOD活性受到抑制。因此，来自八个地点的水对植物造成了严重的植物毒性和氧化胁迫。油麦菜。这些结果补充并证实了评估文献中存在的里约杜坎普河和里约Km 119河水的毒性的研究。鉴于这些物种的严重退化并使不同物种的生存处于危险之中，在这些春季开展的城市和农业人类活动中，坎波·穆朗（CampoMourão）和州政府的公共管理部门迫在眉睫。