Can I Jump from a 30 Ft Rock into Water Without Causing Harm to my Saline Breast?

It is unlikely that you would be able to cause damage to your implants with blunt force trauma once you have fully healed from surgery. So jumping into the water from 30 ft should be safe for the implants. If you don't hurt yourself, you won't harm the implants. 

There is no problem jumping off a rock into water with breast implants. It's nearly impossible to do them harm by blunt trauma. Make sure there are no rocks below.

shouldn't harm implants but then you never know.  Implants come with warranties so I would never restrict my patients from pursuing any activity they wish to do.  Implants should enhance your life and not restrict it in any way.