A disgruntled Work and Income client allegedly smashed two windows at the department's Kaikohe office with a hammer.
The incident occurred at the Community Link offices on Memorial Ave about 8.30am yesterday after a man in a motorised wheelchair was refused a food grant.
The man, 58, was arrested and charged with intentional damage. He is due in Kaikohe District Court on September 28.
Northland Commissioner for Social Development Ski Wisnesky said he took the incident seriously because someone could have been injured or even killed.
"No matter what a client's issue is with Work and Income policy, violence and threats are not acceptable and won't be tolerated. We have a duty to keep our staff safe," Mr Wisnesky said.