It is probably methane gas leeching from the landfill. We pass a landfill when we are going to Cherokee Lake. At times we can see what looks like a light cloud of smoke hanging heavily in the air. When we drive through it the air smells like rotten eggs. At night we can see a large, blue flame coming out of a pipe where they are burning off the methane.
Lots of lakes have methane that naturally escapes into the water. I remember seeing what is called a 'lake turnover' and methane was bubbling to the top and smelled the same as you describe. The water looked thick and gross.




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