Transparency International in Papua New Guinea says the Government must show the political will to tackle corruption, which it says can now be found at village and church group level.
In TI's latest Global Report on Corruption PNG was rated the 151st worst out of 180 countries.
The country report outlined systemic corruption affecting all facets of life with offenders acting with impunity.
TI's spokesman, Richard Kassman, says so far there have been no signs of commitment from the Prime Minister and Cabinet to try and combat the problems.
He says there is also a need for successful prosecutions to result from an ongoing inquiry.
"Some action, consequential action from these commissions of inquiry from the public accounts committee. Heads must roll and unless we have some people go to jail then this apparent feeling of impunity will continue. So we want political will and we want some scalps."