Tevita Kava, 29, fell overboard during the Waitematā Harbour excursion on a Red Boats charter on June 3 last year.
His body was found in water near Te Atatū nine days later.
This week, Maritime New Zealand filed a charge against The Red Boats Limited under the Health and Safety at Work Act, according to the New Zealand Herald.
The company is charged will "failing to comply with duty that exposes individuals to risk of death or serious injury or serious illness".
Kava's cousin, Ngaire Speedy, said the family were still deeply grieving Kava.