The amount of nitrate and phosphate, considered as major inorganic nutrients-cum-pollutants of municipal waste pipes were monitored in the water of a tropical river Gomti in Lucknow city during summer, rainy and winter seasons during 2009. All the samples from the 6 selected sites of Gomti river in the vicinity of this mega city showed the levels of nitrate and phosphate ranged between 14.02-49.13 and 0.16-4.32 mg L-1 respectively, which were beyond the permissible limits (10 mg L-1 NO3 – and 0.1 mg L-1 PO4 3- ) in all the seasons. The maximum values of nitrate and phosphate were recorded during rainy season possibly due to excess runoff of the effluent mixed water through waste pipe lines. Trapa natans (Water chestnut) commonly cultivated aquatic crop in the region was cultured in the 20 L plastic tubs containing Gomti river water, under simulated net house conditions, for 3 weeks. Trapa natans removed nitrate and phosphate upto 71.34 and 74.64% respectively which was significant. Increase of 8.29, 14.59, 70.44 and 24.07% was recorded in the fresh wt., lamina length, protein in fruit and chlorophyll in leaves of Trapa natans respectively.