eng Science and Education Publishing Applied Ecology and Environmental Sciences 2328-3920 2022-04-10 10 4 194 200 10.12691/aees-10-4-3 AEES20221043 article Vanlalhruaitluanga Bochung mbochung@gmail.com 1 B.P. Mishra 1 Department of Environmental Science, Mizoram University, Aizawl 每 796004, India Tuipui river is the main source of supply water in Champhai town, in the state of Mizoram, India. An increase in population and developmental activities may cause a rapid increase in pollutant intensity of the river water. The present study aims to assess the water quality of the Tuipui river for pre-treated and treated water. Various chemical parameters were studied on a seasonal basis (pre-monsoon, monsoon, and post-monsoon seasons) for a period of two years (i.e. from February 2018 to January 2019 and February 2019 to January 2020). The findings reveal that pH ranged from 6.9 每 7.2 for pre-treated water, and 7.1 每 7.3 for treated water, Total Hardness ranged from 30.12 mg/L CaCO3 to 47.83 mg/L CaCO3 for pre-treated water, and 27.16 mg/L CaCO3 to 42 mg/L CaCO3 for treated water, Total Alkalinity ranged from 45.66 mg/L CaCO3 to 78.83 mg/L CaCO3 for pre-treated water, and 42.08 mg/L CaCO3 to 74.08 mg/L CaCO3 for treated water, Acidity ranged from 16.67 mg/L CaCO3 to 50.33 mg/L CaCO3 for pre-treated water, and 10.33 mg/L CaCO3 to 22.33 mg/L CaCO3 for treated water, Chloride content ranged from 0.32 mg/L to 0.57 mg/L for pre-treated water, and 4 mg/L to 4.9 mg/L for treated water, Phosphate-P ranged from 0.01 mg/L to 0.02 mg/L for pre-treated water, and 0.01 mg/L to 0.02 mg/L for treated water, Nitrate-N ranged from 0.1 mg/L to 0.12 mg/L for pre-treated water, and 0.1 mg/L to 0.12 mg/L for treated water, Dissolved Oxygen (DO) ranged from 6.22 mg/L to 6.5 mg/L for pre-treated water, and 7.5 mg/L to 8.3 mg/L for treated water and Biochemical Oxygen Demand (BOD) ranged from 1.2 mg/L 每 1.8 mg/L for pre-treated water, and 0.2 mg/L 每 0.8 mg/L for treated water. The values are within the permissible limits prescribed by various scientific agencies, but long-term use of pre-treated water may cause adverse effects on human beings as water is having traces of impurities like organic substances, nitrates, and phosphates even after treatment. The data were subjected to a correlation coefficient among the different parameters to check the validity and significance of the results. http://pubs.sciepub.com/aees/10/4/3/aees-10-4-3.pdf chemical parameters pre-treated water treated water water quality Tuipui river