Environment Canterbury spent more than $5 million on communicating with the public and within the organisation in the last financial year.
Data released under the Local Government Official Information and Meetings Act showed over the 2015-16 financial year, ECan spent $5,620,391 on its communications and external relations department.
The figure had jumped from $3,422,727 in the 2010-11 financial year.
ECan said that made up staff wages, communications advice, promotional design and production, printing and advertising, web development, photography and video, media monitoring, market research and behaviour change, and sponsorship and community events.
It also included operational expenses such as travel, phones, learning and development, and stationery.