The condition of sea water quality is very important to study to determine whether a sea water is polluted or not. Muncar Fishing Port, located in Banyuwangi Regency, is the largest fish port on the island of Java. Economic activities around the port are dominated by fish canning factories which cause a very high amount of waste. Factory waste that is not managed by the factory is dumped directly into the ocean so that the waters at the Muncar Fishery Port become polluted. This study aims to determine the quality of sea water at the Muncar Fishery Port using a TDS meter. The parameters used in this study consisted of water temperature, pH, and PPM. Research samples were taken in five locations that have different characteristics. Based on the results of the research, the first and second locations have high levels of pollution which are characterized by low pH values (7) and high PPM (8.3). The third, fourth, and fifth locations have safe values so that they can be classified as unpolluted waters.