The main union representing public servants says an increasing number of departments are now turning to redundancies to meet their savings targets, but news at one employer continued to improve.

The Community and Public Sector Union's (CPSU) national president Alistair Waters said the number of involuntary redundancies at the Department of Communications had been reduced from about 120 to about 20.

The Canberra Times broke the news in June that the department had reduced the scale of its spill-and-fill process, where staff would be forced to reapply for their jobs, following union lobbying.

The spill-and-fill would only target executive positions, while APS staff avoided the stressful process. 

“There is always a better way than pitting colleague against colleague," Mr Waters said.

"It’s good to see that Communications has backed away from a spill-and-fill for most of its staff, but the reality is that it is still very tough out there in public service.

“With the 16,500 cuts and the prospect of large scale outsourcing from the National Commission of Audit, there is definitely worry and concern in the public service.”

The department has been aiming to reduce its 500-strong workforce by 20 per cent to 25 per cent via natural attrition and redundancies.