Tsurang, a major river in the Mokokchung district of Nagaland, northeast India, shares great aspects of traditional importance for the Ao Naga tribes and is a part of natural commodity providing water to the agrarian community for irrigation and livestock rearing. However, various environment detrimental activities are practiced along the course of the riverbank, particularly coal mining and agriculture. The present study was conducted to examine the seasonal water quality index (WQI) of the Tsurang river from three selected sampling stations. Overall, the water quality status was rated as “Good” in winter and spring while “Poor” in summer and autumn. In all the seasons, downstream (S3) located at the human settlement area presented higher WQI values compared to upstream (S1) and midstream (S2). The parameters such as turbidity, DO and BOD played a central role in affecting the WQI; although, no such significant roles in case of nutrient elements were observed in affecting the water quality. The WQI revealed that Tsurang river water is deteriorated due to coal mining and other anthropogenic activities practiced along the stretch of the river and the water needs to be pretreated before consumption. Therefore, proper management strategies and conservation efforts should be enforced and regulated by policymakers to protect the river from further contamination.

楚朗是印度东北部那加兰邦 Mokokchung 区的一条主要河流，对奥那加部落具有重要的传统意义，是为农业社区提供灌溉和牲畜饲养用水的天然商品的一部分。然而，沿河岸的路线进行了各种对环境有害的活动，特别是煤炭开采和农业。本研究旨在从三个选定的采样站检查楚朗河的季节性水质指数 (WQI)。总体而言，冬春季节水质状况为“良好”，夏秋季节为“差”。在所有季节中，与上游（S1）和中游（S2）相比，位于人类居住区的下游（S3）呈现出更高的 WQI 值。浊度等参数 DO 和 BOD 在影响 WQI 方面发挥了核心作用；然而，没有观察到营养元素对水质的影响如此显着。WQI 显示，由于煤炭开采和沿河段进行的其他人为活动，楚朗河水变质，需要在消费前对水进行预处理。因此，政策制定者应执行和规范适当的管理策略和保护工作，以保护河流免受进一步污染。WQI 显示，由于煤炭开采和沿河段进行的其他人为活动，楚朗河水变质，需要在消费前对水进行预处理。因此，政策制定者应执行和规范适当的管理策略和保护工作，以保护河流免受进一步污染。WQI 显示，由于煤炭开采和沿河段进行的其他人为活动，楚朗河水变质，需要在消费前对水进行预处理。因此，政策制定者应执行和规范适当的管理策略和保护工作，以保护河流免受进一步污染。