It might also be nice to know where (and when) groundwater is safe to drink our descendents will perhaps not be thrilled to learn about the "time bombs" we hav

It might also be nice to know where (and when) groundwater is safe to drink our descendents will perhaps not be thrilled to learn about the "time bombs" we have left them, steadily inching into aquifers or up into surface water. that is of course if they are not too distracted locating water of even dubious potability to care