Not necessarily. The clarity of water is not a direct indicator of its safety. There are many organic compounds that dissolve in water and the water clarity is still good to the average human. Sometimes mixtures of water with inorganic compounds produce colored water, but there is a list provided by the World Health Organization of all harmful substances that can be present in water. The data, linked below, lists the method of detection of a certain chemical along with the maximum advised intake of chemicals before causing adverse health effects.
There are many methods to accurately test water safety, whether the water is clear or not. For organic solutes we can utilize variations of gas and liquid chromatography techniques. For inorganic chemicals we can use various spectrometric methods as well as electrodes, volumetric, and colorimetric methods.
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