Martin said the settlement demonstrates the Government's commitment to pay equity for all women in New Zealand.
"Just a week after we celebrated 125 years of women's suffrage, this decision recognises a historic gender-based undervaluation of Oranga Tamariki social workers, who perform vital work in keeping children and families safe."
The Council of Trade Unions (CTU) President Richard Wagstaff said the offer showed the power of unions to deliver pay equity settlements that significantly advance women's equality in New Zealand.
"A 30 per cent average pay rise is a credit to the PSA, and to these social workers who persisted so long helping Kiwi kids, despite being so underpaid."
He said the CTU estimates more than 63,000 working people have now had a pay equity settlement or offer.
Oranga Tamariki and PSA will jointly present the settlement to those in scope of the claim, at a series of meetings around New Zealand over the two weeks from October 8.
Oranga Tamariki social workers, who are PSA members, will then vote on whether to accept it.