The Burn. The Burn, #1

The Burn is full of nuclear fallout, roving gangs, anarchy, unreliable plumbing. That's what Terra's father tells her. She has lived her whole life in comfort in a colony at the bottom of the Pacific Ocean. She hates it. And she would pay any price to leave. But when Terra finally escapes the colony, she finds out her father is right. She finds a group of survivors that quickly become friends, and every day with them is a race for survival.
When she witnesses and commits unspeakable acts, she has to decide where her loyalty lies: with the colony she despises or The Burn, where every day is filled with nightmares.