NSW Premier Chris Minns will also appoint a senior official to co-ordinate a statewide cull.

More than 97,000 feral pigs have been eliminated across the state but farmers estimate there are millions more.

"The program will aim to reduce the density of these pigs across NSW through co-ordinated and integrated statewide feral pig control programs," Mr Minns told a farming conference on Tuesday.

The state co-ordinator will work with federal authorities as the number of pigs blows out across Australia, with aerial shooting to be ramped up.

"The feral pig population has increased substantially over recent years, causing millions of dollars worth of damage in lost agricultural production and environmental degradation," Mr Minns said.

The most recent estimate of feral pigs across Australia is about 3.2 million, although that figure is from 2020 and doesn't account for the recent La Nina weather pattern which saw record-breaking rain and some pig populations explode.

Australia's feral pig co-ordinator Heather Channon welcomed the new role.

"This will ...strengthen partnerships and enhance co-ordinated feral pig control efforts across different land tenures and uses," Dr Channon said.

But while farmers said the funding boost was a good start, the Nationals criticised the investment as short-sighted.

"A one-year sugar hit won't achieve the results we need unless there is a plan and funding for the weeks, months and years after that," the party's NSW leader Dugald Saunders said.

"I would also like to know where the $8 million is coming from - I hope it is new funding and not being taken from the Regional Growth Fund at the cost of other programs."

During the conference Mr Minns fielded questions from farmers about coal seam gas, rejecting calls to review Santos' exploration of the Liverpool Plains.

"I don't know what Santos is going to do next, it's up to them," the premier said.

"But we're not going to use extrajudicial decision making to knock over what has been, what we regard as a lawfully entered into, independently assessed project in the Liverpool Plains."

Dozens of farmers gathered near Gunnedah in north west NSW earlier this year to oppose Santos exploring more coal seam gas on agricultural land.

Australian Associated Press