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Water is quite essential natural element for all kinds of life. The quality of water is vital concern for mankind since it is directly linked with human welfare. The water samples were collected from sewage treatment plant (from both 18 MLD and 27 MLD) situated in Jagjeetpur, Haridwar. The study was carried out for a period of four months and total 15 sampling were done during this period. Results revealed that in inlet pH varied from 7.13 to 8.76 and in outlet 6.01 to 8.2, total solids in inlet varied from 751 mg/l to 897 mg/l and in outlet from 509 mg/l to 749 mg/l. The total hardness in inlet was found between 212mg/l  to 249 mg/l and in outlet from 178 mg/l to 210 mg/l. Chloride in inlet varied from 96.5 mg/l to 112.9 mg/l and in outlet 45.4 mg/l to 57.2 mg/l , alkalinity values in inlet were reported between 178 mg/l to 211 mg/l  and in outlet from  154 mg/l to 205 mg/l. Dissolved oxygen in inlet was found between 0.70 mg/l to 1.96 mg/l and in outlet from 4.01 mg/l to 6.22 mg/l. Biochemical oxygen demand in inlet ranges from 90 mg/l to 129 mg/l and in outlet from 3.6 mg/l to 8.5 mg/l , Chemical oxygen demand in inlet ranges from 231 mg/l to 252 mg/l and in outlet from 16 mg/l to 30 mg/l. This study showed that both the treatment plants are working in good condition.