Castillo's successful efforts to find a solution in anticipation of future hurricanes is a bright spot in what feels like a slow, frustrating process for millions of Puerto Ricans still grappling with damaged homes, denials of aid from FEMA and unresolved insurance claims.

Families are reeling from the loss of nearly 3,000 lives in the deadliest U.S.-based natural disaster in 100 years, which has come to define a sad turning point in the island's history.

Over 200,000 Puerto Ricans left for the mainland, at least temporarily, and the island incurred about $90 billion in damages.

The recovery has been dogged with questions about both the federal and local government's response and the added challenges due to Puerto Rico's territorial status, its crippling debt and the ensuing federal oversight, which has slowed down funding for recovery and strategic planning.

The Federal Emergency Management Agency (FEMA) acknowledged agency failures in areas such as staffing and coordination in an after-action report. While the federal government has announced historic funding for the island in the area of housing, the funds are yet to be disbursed.

The hurricane's aftermath has boosted several opportunities for much-needed innovation in areas such as energy and urban planning. Yet recovery efforts continue to feel very much like unfinished business.

Still waiting

Every time Ramón A. Paez Marte, 44, looks at his home’s patched-up roof and broken door, he’s reminded of Hurricane Maria’s power.