Those who owned property as at October 2016 within the Bandiana investigation area can join action by Shine Lawyers to seek compensation from the government.

Those who do not wish to be part of action need to opt out before September 30.

If the class action is unsuccessful, members will have no liability to pay any costs.

If compensation is determined, legal costs will be be shared among members who benefit.

Shine Lawyers special counsel Joshua Aylward said a "substantial amount" of people had registered across the seven sites included in the class action.

"They realise that if the matter settles or there is a judgement in the favour of the applicants, there's a great likelihood that they will receive some compensation," he said.

"If people want to opt out, they should seek independent legal advice about what that means for them.

"People shouldn't trust what they're being told by anybody, really, they're smart enough to go online themselves and find reputable sources from around the globe.

"They can find out for themselves what PFAS does, what other countries are saying are acceptable levels."

Mr Aylward said registrations would remain open after September 30.

"The parties are working towards remediation in the second half of 2021," he said.

"The court appointed a land valuation referee; this person is to determine the loss particular properties in these communities have suffered because of PFAS.

"He is due to produce his report in early December.

"This is the same process that the same judge put in place in Oakey and Katherine.

"If people owned property in the relevant area ... I would say they should go to the website and read why they should register."

In this case, a litigation funder pays the upfront legal fees in exchange for a cut of any settlement money.

Maddens Lawyers, which ran a class action for those affected by the Walla tip fire, will advance individual claims on a 'no win, no fee' basis for landowners and people should make contact before September 30.

Principal lawyer Kathryn Emeny said individual claims had been advanced in the Northern Territory.

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"Because it's advancing by way of negotiation directly with the Department of Defence, at this stage, formal court proceedings haven't been issued, and so there's some cost benefits associated," she said.

"From our perspective, there are a number of benefits associated with an individual claim; each property is different and PFAS has impacted people in different ways.

"I would encourage people to be proactive and to explore all of their options."

The Federal Court notice issued to Wodonga residents outlined it was not in respect of personal injury claims.

Those who do not opt out remain unregistered members of the class action by Shine Lawyers, but in order to receive any settlement, they will need to register.