The soluble ferrous and soluble inorganic sulfides form FeS granules and cause the water to become seriously turbid. FeS granules are black and cloud the lake water so much that the water looks black [19].
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Water can also appear murky due to the presence of planktonic algae, which are microscopic organisms that create visually dense blooms on the water's surface. Planktonic algae are known to appear in blue, green, brown, and red colors, which are most apparent around the shoreline.
Marine and freshwater beaches, lakes, rivers, and ponds can be contaminated with a number of things. Bacteria, chemicals, and other pollutants from sewage bypasses, combined sewer overflows, human and animal feces, urban runoff – can all pollute and contaminate waterways.
That water often carries sediment with it. This suspended sediment gives the river a muddy appearance, in addition to the dark coloration. When suspended in water, it is termed turbidity, and like most things, a little can be good while too much is detrimental to the health of the river.
Shifts in lake water color can indicate a loss of ecosystem health. While substances such as algae and sediments can affect the color of lakes, the new study finds air temperature, precipitation, lake depth and elevation also play important roles in determining a lake's most common water color.
Several smaller streams, including Stony, Stewart, and Fisher Creeks in the south, Mud Creek in the west and Cain's Creek to the north, also flow into Black Lake. These rivers and streams deliver great quantities of dark tannin-stained waters that give the lake its name.
Pools also tend to be much cleaner than natural lakes. This is because most pool owners take extra care to make sure the pool is sanitized, oxidized, and pH balanced on a regular basis. You're far less likely to pick up an infection from swimming in the local pool.