Ice tea is a drink that is popular with the public because the price is very affordable and is often used as a food companion. Iced tea drinks are made using water and ice which is one source of Coliform bacteria contamination. The purpose of this study was to determine the presence or absence of Coliform bacteria in iced tea drinks at the WTB night market. The method used is the MPN (Most Probable Number) index method and the results obtained are 5 samples from various sellers at the WTB Night Market, obtained from 5 samples containing bacteria because the results have a very high index value, namely < 979/100 ml which indicates that the quality of the iced tea water is also very poor. From the results of the study, it can be concluded that the iced tea sold at the WTB Night Market has been contaminated by Coliform bacteria.