The Earthquake Commission has admitted to another breach of privacy after information on up to 260 claimants was sent to the wrong customers.
Its chief executive Ian Simpson has launched an inquiry into how the information ended up on a letter that was sent to some clients.
One side of the letter had the correct information for the recipient, but the second side of the page had the address, phone number, insurance company and the damage reported by a different claimant.
It contained no financial information.
The letter was collated manually in Wellington and the error occurred during the collation process. Mr Simpson said at this stage it appeared to be human error.