The town of Sweetwater, Missouri is known for its mineral resources, particularly rich lead sulfide (galena) deposits. I am curious to find the origin of the name "Sweetwater" and if it has any connection with lead compounds that at one time or another leached into the local water resources (I believe lead acetate tastes sweet). In any event, I can't seem to find any history or such a connection through internet research.
According to The State Historical Society of Missouri:
Sweetwater is the name of a little trading-point established on Sweetwater Branch just after the Civil War. It was named for the branch.
Sweetwater Branch was named by the pioneers for the unusually good water in the stream.
The place (and branch) are both in Newton County, Missouri. The same reference linked above indicates that what was once called Sweetwater is now referred to as Boulder City (because of the boulders nearby).