Welsh will appear in the Whangārei District Court tomorrow.
It is alleged that after Welsh went into the facility he managed to return to Whangārei, 158km away, where he was arrested shortly after 10am on Saturday.
Head of managed isolation and quarantine Air Commodore Darryn Webb confirmed the man would be isolated as a precaution while the person he briefly spoke to at the facility had tested negative.
"The returnee involved tested negative at their day three test and health officials have determined the contact to be low risk. However, the member of the public who was arrested will be isolated as a precaution while the returnee's second test results are awaited."
MBIE confirmed yesterday the returnee's second test results were negative.
Webb said the Whangārei man breached security by allegedly forcing his way through the outer 1.8m fence and having brief contact with a returnee who was in the exercise area of the facility.
"Police on site witnessed the incident and took immediate action to intervene, however, the member of the public fled the scene in a vehicle."