I'm hardly a supporter of efforts to remove HH reservoir in the near term. But... surely "we have to keep on importing water from two hundred miles away because the water all around us is a biohazard" is a less than ideal state of affairs, no?
ETA: of course, the biohazard aspect is just one of the reasons we rely on HH and not even the biggest. But it plays a role.
Less than ideal? Yes. Changeable at this stage? No. At some point we may have an alternate source of water but until this removing that reservoir will create a disaster.
A biohazard is when you spill untreated sewage into the Gowanus Canal during heavy storms because you have a combined sewage system, and it's full of freakish bacteria.
I assume when you said "biohazard" you thought "hazardous to biological things". That's really covered with just the "hazard" part though. :b
ETA: of course, the biohazard aspect is just one of the reasons we rely on HH and not even the biggest. But it plays a role.