Turbidity is one of the most important element that represents drinkability. Particulates including bacteria, micro-plastics cause increase of turbidity. THE.WAVE.TALK developed an IoT water sensor that could test drinkability of our everyday water more cost-effectively by checking the turbidity. “WaTalk” is a portable water sensor that any non-experts could use to test tap water. With less than 150 USD, anyone can check the water quality with the same level of accuracy as 6000USD products. Our ultimate goal is to provide water quality forecasts, so that consumers can avoid and take action before the water is contaminated.