1

It is still not as awesome as the pipeline of beer (Or was it whiskey?  That would have been even better.)...

2 I bet it caused a huge traffic jam on the morning commute, as everyone was driving very slowly...

3

Some of the news reports I've seen about this have pointed out that THC isn't soluble in water to any significant degree. There was only one lab that did testing, and it tested 10 samples and declared six of them positive.

Samples have been sent to other labs and definitive results are supposed to become available tomorrow. I suspect what we're going to discover is that the first lab is full of shit.

Also, there are five wells and only one of them tested positive. It's been taken offline.

A different point: THC is expensive and the amount it would take to contaminate the water supply for an entire town would be titanically expensive. It's difficult to believe anyone would waste their drugs like that. (When they would be getting wasted themselves instead, heh.)

So I think this is going to be a false alarm, and a major embarassment for someone.

4 Have to keep in mind that they can now detect things like that at part per trillion levels. 

5 The other tests came back, all negative, and the alert has been cancelled. The report I saw didn't outright state that the first test had been a false positive, but that's certainly the implication.