The Horowhenua Rowing Club treasurer fears there may be more attacks on the club, after vandals broke in and destroyed all but two of the club's boats.
Jo Mason discovered the damage to the Levin club on Saturday morning.
"A hole had been cut through the iron, and the shed was entered and 25 boats were pulled off their storage racks and had holes, made with some sort of hammer, broken through all of the hulls."
Costs could reach $100,000 and some of the boats might be beyond repair, she said.
"The estimates are $500 a hole and there are 75 holes - and that's $40,000 - and some of the boats will have to be replaced."