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Various waterborne disease outbreaks have been reported even after disinfection with conventional techniques due to development of resistance in microorganism. Moreover, generation of carcinogenic disinfection by-products (DBPs) poses additional problems. This has prompted an exploration of alternative antimicrobial agents for disinfection of water. Over the last few decades, photocatalysis has been widely applied for degradation of various pollutants and inactivation of waterborne microbial pathogens. The present study was focused on the synthesis and characterization of Ag-TiO2 nanocomposite by doping of TiO2 nanoparticles (NPs) with silver (Ag). Water disinfection studies were conducted in a photochemical reactor in batch mode using UV and visible light irradiated Ag-TiO2 nanocomposite (NC). Studies conducted using four opportunistic bacterial pathogens, ie Escherichia coli (MTCC 443), Pseudomonas aeruginosa (RS1), Burkholderia cepacia (ES1) and Acinetobacter baumanii (RS4) revealed effective disinfection of 103 CFU/mL of bacteria within 30 min even for visible light irradiated nanocomposite (5 mg/100 mL).