I was literally going to post the exact same article. Up until I read this a few days ago, I would have jumped into a debate with "desalination! just do it!" -- turns out it's much more complicated than that.

Why aren't they simply boiling the water, nuclear powered? That article says membrane desal leaves half the water extra salty, is that right? Does boiling it leave that much? I'd imagine there'd just be a concentrated, mostly-solid byproduct.

I'm probably wrong else everyone would already be doing this. OTOH, many people and places seem to be going against nuclear power, so perhaps it isn't just a technical issue. At any rate, that article just left more questions than answers.

tl;dr: Desal is too energy intensive and expensive to be feasible while other conservation options haven't been tried yet. Also, massive potential environmental impact for water intake and brine output.