The chemicals don't hit the water table. They only do if they make a mistake and then the oil is leaking into the water table. Mistakes happen with normal wells too.

Earthquakes, you can get them injecting plain water into faults so sure it can induce them. Solution, don't inject into faults. The magnitude 2-3 stuff that is normally seen is not noticeable without equipment anyway. There is a disposal well near Greeley that is temporarily shut down right now while the quakes are being looked at.

Primarily scare tactics by greenies.

(We do not export oil. Gas on the other hand...)