A study released Thursday says local jurisdictions must do more to protect the health of the Potomac River and encourages more incentives for property owners to green up their homes and other buildings.

“We wanted to sound an alarm — there’s a tsunami that’s coming and this storm is going to wreak havoc on the Potomac unless we take action now,” said Hedrick Belin, president of the Potomac Conservancy, the group that issued the report.