A former employee of the Newton assessor’s office, ­accused of wrongly giving ­elderly residents a $1,000 property tax exemption, was ­arraigned Monday on charges of forgery and filing a false ­report by a public worker.

Stanley Dobies, 62, pleaded not guilty to the charges, said Stephanie Guyotte, a spokeswoman for the Middlesex district attorney’s office. If convicted, Dobies faces up to 10 years in prison, Guyotte said.