The first Graffiti Action Day will encourage the public to join council and Keep Australia Beautiful NSW crews in organised clean-ups.

Lord Mayor John Tate said although the Hunter's plans for the day were not finalised, he was expecting a strong response in Newcastle on the day.

The city had maintained momentum in facing the problem but public support was vital.

"We've all got to own this problem, it can't be left to a council or government," he said. "I think the majority of the public find it abhorrent."

Vandalism remained a costly and time-consuming problem for Newcastle, Cr Tate said, but was still important for the region.

The Herald reported last month that graffiti clean-up had cost the Hunter $32 million since 2005, but Cr Tate said there was a hidden cost as residents and businesses simply cleaned their own properties.

"A lot of [graffiti] is on private property, and I'm sure people get tired of cleaning it up."

Attorney-General John Hatzistergos said the event was aimed at expressing the similar frustration graffiti was causing across NSW.

"Graffiti Action Day will put the power back in the hands of the community," he said.

"We are sending a clear message to graffiti vandals that law-abiding residents of NSW will not tolerate their criminal behaviour."

The event follows increased penalties for graffiti introduced late last year, with offenders facing 12 months in prison.

Graffiti can be reported to Newcastle City Council by calling 1800 223 840.