H.R.672: To protect the critical aquifers and watersheds that serve as a principal water source for the Commonwealth of Puerto Rico, to protect the tropical forests of the Karst Region of the Commonwealth, and for other purposes.

Puerto Rico Karst Conservation Act - Authorizes the Secretary of Agriculture to make grants, enter contracts, and exercise specified authorities to acquire, protect, and manage land and forest resources in and adjacent to the Karst Region of Puerto Rico for the purpose of protecting and conserving the water quality and aquifers and the geological, ecological, fish and wildlife, and other natural values of the Region.

Establishes the Puerto Rico Karst Conservation Fund which shall be available to the Secretary for purposes of this Act.

Makes all lands in the Region eligible for inclusion in the Forest Legacy Program.