A Senate committee is still waiting for a response from government agencies to a report published more than 20 years ago.

The figure was revealed in an audit released on Tuesday, which also showed a delay of more than 13 years to a House of Representatives committee report.

The auditor-general examined three bodies - the Attorney-General's Department, Australian Federal Police and Commonwealth Director of Public Prosecutions - that had failed to properly respond to the committee work of MPs and senators.

Only one per cent of Senate committee reports were responded to within the recommended three-month time frame and six per cent of House of Representatives committee reports were responded to within six months.

The Australian National Audit Office said the timely implementation of "agreed to" recommendations was an important part of accountability and realising the full benefits of parliamentary inquiries and audits.

It found the Attorney-General's Department did not have proper arrangements in place to address committee recommendations.

"AGD did not have an effective system to monitor the implementation of recommendations," the report said.

The auditor-general recommended the department improve its arrangements and that all three organisations establish and document proper processes to implement the recommendations., including setting time frames.

All three agreed to the auditor's recommendations.