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I've done groundwater work at a site that was directly adjacent to a very, very old cemetery in Dallas. It was by far the nastiest water I encountered during the 10 or so years I did that kind of work. It was perched water and it isn't used for anything, but you could smell the cemetery in that stuff. For those unfamiliar with perched water.......

A perched water table (or perched aquifer) is an aquifer that occurs above the regional water table, in the vadose zone. This occurs when there is an impermeable layer of rock or sediment (aquiclude) or relatively impermeable layer (aquitard) above the main water table/aquifer but below the surface of the land. If a perched aquifer's flow intersects the Earth's dry surface, at a valley wall, for example, the water is discharged as a spring.