We herein report the oxidation efficiency of different concentration ammonia waters via a complex photocatalyst of zeolite and TiO2 under UV light. The generated NO2- and NO3- concentrations were highest when a high concentration of ammonia was oxidized by zeolite-TiO2. The prepared photocatalyst was characterized via X-ray diffraction, and Brunauer-Emmett-Teller surface area measurement.