Unison regional secretary for Beds, Herts & Bucks, Shaun Hilliard said research by the Low Pay Unit indicates widespread poverty pay in the three counties.
He commented: 'The two things that have been striking in this initial investigation are, firstly, that large numbers of our members in the health and council services are unfairly paid and, secondly, their pay has fallen behind both inflation and pay elsewhere in recent years.
'Now both of those two particular reasons are very much associated with policies carried out by the government, where they have limited pay increases for public service workers and cut public expenditure'.
The local authorities are expected to increase their offer to around 3%, far short of what the unions are seeking.
-- Unison members have voted for strike action over proposed cuts of £1.6m in the new Cardiff CC's housing budget, reports BBC Radio Wales.
If the cuts go ahead 93 workers could lose their jobs.
Union members will meet on Monday to discuss the possible strike action.