The Ganga river in Bihar, India, is heavily polluted by sewage, affecting its water quality. Samples from drain water and the river itself showed high levels of pollutants like BOD, COD, TDS, TSS, and coliform bacteria. The water near the riverbank had higher pollution levels than the middle stream. Sediment analysis revealed major elements like Si, Fe, Ca, Al, and K. The untreated sewage discharge has severely deteriorated the water quality of the Ganga river, making it unsuitable for drinking.