In the present study, the effect of disinfectant addition into drinking water on quail (Coturnix coturnix japonica) growth performance, egg quality, and water quality parameters was investigated. Drinking water quality was positively affected by addition of disinfectant (sodium N-chloro-p-toluenesulfonamide trihydrate). Microbial load of drinking water was reduced by disinfectant addition. Feed intake of the quails provided with disinfected drinking water was lower, while water intake and live weight gain was similar between the trial groups. Quail egg quality was affected by addition of disinfectant. The eggs of the quails provided disinfected drinking water had lower egg weight, shell strength and thickness, but the protein and mineral composition was not affected by disinfectant addition. The Haugh units of the eggs of the quails provided with disinfected water were higher, thus these types of eggs could be readily more suitable for the bakery industry. It can be concluded that addition of disinfectant into quail drinking water may improve the status and egg quality of quails.