The legislation, which complements shield laws for journalists introduced last week, gives whistleblowers the option to go public if their complaint has not been investigated within three months.

"It's absolutely critical that if someone in a department sees something going on and reports it, they ought to expect that it's going to be investigated," Deputy Premier Vickie Chapman told reporters on Monday.

She cited past reports by Independent Commissioner for Corruption Bruce Lander which found whistleblower legislation in its current form was rarely used.

"People felt worried about their employment, that they'd lose their job, that they'd miss out on advancement, that their family might be prejudiced in some way," she said.

Under the new legislation, retribution in terms of employment or promotion disadvantage would also become illegal.

"We say that it's important they have this protection," Ms Chapman said.

"We are committed to ensure that our public sector is given this protection and it's also consistent with the fact that we now give them a very strict obligation to report matters under the ICAC Act."

The new bill comes after the Liberal government last week introduced separate legislation to shield journalists from criminal or civil liability if they do not disclose the identity of their sources when the information is in the public interest.

Under the new law, journalists cannot be compelled to answer a question or produce a document that may disclose the identity of an informant.

Australian Associated Press