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CrowdWater is a citizen science project that uses a mobile phone application (app) to collect hydrological data. The project aims to develop and test methods for hydrological measurements that do not require sensors. So far, the app is used to collect data about stream water levels, the state of intermittent streams, soil moisture, and plastic pollution. The app can also be used to record general characteristics of streams, such as the color, the presence of fish and other living beings, or water pollution. Perhaps without realizing it, many people make visual water quality assessments for their daily decisions. Based on visual aspects of the water, people decide whether the water is suitable for swimming or drinking. This presents an opportunity to explore the potential of a visual approach through citizen science-based water quality observations. Water color and clarity are one of the most frequently used indicators for the …