What determines the color of water as seen by the human eye?

The color of water as seen by the human eye is primarily determined by the absorption and scattering of light. Water absorbs colors in the red part of the light spectrum and reflects or scatters blue light, which is why it often appears blue. Additionally, the presence of substances like algae, sediments, or pollutants can alter the perceived color of water by changing its transparency and the wavelengths of light that are reflected. Factors such as depth, angle of sunlight, and surrounding environment also play a role in how water's color is perceived.