Mr Bremer's inaction reflected adversely on his fitness to be a teacher, the tribunal stated.
However, it did not go as far as to deregister him.
No suggestion was made that Mr Bremer was in any way associated with Harter's offending, or that he had actual knowledge of it at the time.
Mr Bremer could not be contacted for comment yesterday and the school's current principal, Nick Reed, was also unable to comment.
The Education Council's manager teacher practice, Andrew Greig, said the decision was a test case and a very important one for principals and boards of trustees to be familiar with.
Mr Bremer was not held responsible for the board's failure to file a mandatory report and entering into a confidentiality agreement with Harter.
The board was in breach of its statutory obligations under the Education Act 1989 but when the tribunal investigated, the statute of limitations at the time, which was six months, had run out.
The censure would be on Mr Bremer's record and the council could advise prospective employers of the censure.
A parent whose daughter attended Harter's drama lessons said she still felt the tribunal's decision to censure Mr Bremer was a "pretty severe punishment".
She felt sorry for Mr Bremer, but wondered if he had taken the complaints seriously.
"It's always hard to know what's going on behind the scenes", she said.
"Being an educator, you always need to be careful. Personally I think it's a pretty severe punishment but if my child was the victim, I don't think I'd be sympathetic."
Hawke's Bay Primary Principals Association president Robyn Isaacson said her thoughts were with families involved for what has been a very long and drawn-out process.