George was one of three charged last year by the SFO over what is alleged was a culture at Rodney District Council, then later Auckland Transport, where accepting gratuities became part and parcel of the working environment.
Auckland Transport also welcomed the guilty plea and the public sector organisations' chief executive David Warburton said the proceedings were kick-started by an internal investigation in 2012 into the management of contracts.
Warburton said procurement and contractual processes have since been improved, but that they need to be continually monitored and reviewed.
Murray John Noone, George's superior at Auckland Transport during the alleged offending, is alleged to have received more than $1m in gratuities and faces six charges of accepting bribes.
Stephen James Borlase, who had run private contractor Projenz, faces eight charges of bribing George and Noone and four of doctoring the number of hours claimed to have been worked in invoices to Council.
Borlase and Noone have pleaded not guilty and face an eight week trial starting September 19.