The effect of disinfectant (2% Halamid, N-Chloro-Paratoluenesulphonamide trihydrate) addition into drinking water on the growth performance of three different chicken strains, Plymouth Rock, Australorp and Village (local mix-breed village chickens) was evaluated in the present study. Supplementation of disinfectant clearly improved the microbiological quality of chicken drinking water, by reducing the total bacteria, coliform and E.coli counts. On the other hand, disinfectant addition decreased feed and water intake of all chicken strains. Furthermore, the results revealed that feed and water intake was strain dependent. Lower feed conversion ratio was observed for chickens provided with disinfectant supplemented drinking water. When considering the live weight gain (LWG) monitored through the 10-week trial, it was found out that the live weight gain of the Australorp and Village strains were negatively affected by disinfectant addition, while the live weight gain of the Plymouth strain was not affected by addition of disinfectant. In the present study, it was shown that addition of disinfectant clearly improved the microbiological quality of drinking water, while the response of different chicken strains to disinfectant addition may vary.