Access barriers at hotspots and surveillance cameras are among the initiatives to be rolled out across NSW in the next four years.

First and foremost, however, is building a culture where illegal dumping was not tolerated.

The NSW Environmental Protection Agency's regional operations manager, Rob Hogan, said illegal dumping continued to be a series problem for landowners and managers across the state.

"It's potentially harmful to public health, expensive to clean up, unsightly and criminal," he said.

The forum brought together public land owners and managers from councils, the National Parks and Wildlife Service, Aboriginal land councils and other state government agencies.

"Working together, making it harder for people to dump and get away with it and getting the public on board are effective ways we can combat this problem," Mr Hogan said.