Sounds like the same sort of problems as up here. For one thing, we're dealing with a couple of rivers (not an ocean) from which the water is being pulled out of.... and people are starting to get pissed off about that. Then it's being dumped. The thing is, it's being dumped very carefully like you say.
Some are considering heavy taxes on water usage. I don't know where my thinking is on that. Because I don't know of what use that will be, or what effect that would have.
But I do tend to get a little alarmed when I read that oil up here will last 100 years or so, but that the water that enables the drilling will last a third of that time.