When algae or bacteria naturally increase in source water due to seasonal shifts, Geosmin and MIB readings can rise above that of the taste and odor threshold which leads to unsatisfactory drinking water (while taste and odor of the water is poor, the water does remain safe to drink). 

Alternatively, geosmin is also attributed to why we like the smell of the air after a rain storm

Humans can detect the smell of of geosmin at about 15 parts per trillion (15 nanograms per liter). To further illustrate, if you poured a teaspoon of geosmin into the amount of water that could fit into 200 olympic-sized swimming pools, you could still smell it. 

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