McNabs Island has been hit by vandals for a second time this year after interpretive signs were severely damaged in the last two weeks.

Cathy McCarthy with the Friends of McNabs Island Society says the group noticed on Saturday that the newly-installed interpretive panels had holes drilled into them and were scratched.

A panel featuring a photo of businessman Bill Lynch had holes drilled into it. (Cathy McCarthy)

McCarthy says the signs cost the volunteer society around $15,000.

"Someone has taken something sharp, a knife, and gouged out and scratched all the panels. And they also took a drill over to McNabs and drilled holes in one of the photos on the panels," she said.

In the spring, solar panels from the island's new composting toilet were stolen. No one has been apprehended in connection with the case.

The group plans to report the vandalism to police, McCarthy says.

"Why would someone go over there and damage these interpretive panels that everyone loves?"