And the Department of Defence can't give a timeframe of when the reports might be released, sighting the COVID-19 pandemic as one reason the report has been delayed.

The Jervis Bay and the Wreck Bay Aboriginal community were initially told in December 2017 that a number of their water and food sources were contaminated by PFAS.

PFAS - per- and poly-fluoroalkyl substances - are a group of chemicals that include perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonate (PFHxS), which were widely used in firefighting foams at a number of locations, including defence facilities such as Albatross and the Jervis Bay Range, which also takes in HMAS Creswell, until being phased out in 2004-05.

PFAS chemicals are bioaccumulative - they do not break down in the environment and are predominantly spread from contamination sites with water movement.

A Human Health Risk Assessment (HHRA) released in 2018 indicated eating seafood and drinking water from catchments such as Mary and Summercloud creeks, previously a primary source of food and water for the Wreck Bay community could pose a risk to human health.

Even swimming in contaminated areas such as Captain's Lagoon was considered a risk.

The plan on how to manage the PFAS contamination and the Ecological Risk Assessment, a detailed environmental investigation to evaluate potential exposure-risks to plants and animals, within the investigation area were both due in the first quarter of this year.

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Defence says it has been regularly engaging with the Jervis Bay community about the progress and findings of the PFAS detailed environmental investigation.

"We have been in regular contact with the Wreck Bay Aboriginal Community Council (WBACC) Executive to discuss these documents and have updated them in response to WBACC feedback," the spokesperson said.

"However, following government health advice relating to COVID-19, defence has decided to postpone all face-to-face PFAS community engagements until further notice."

The most recent community information sessions at Jervis Bay were held in July 2019 to present the findings of the Detailed Site Investigation, Human Health Risk Assessment and the interim Ecological Risk Assessment.

"Defence is currently finalising the Ecological Risk Assessment, supplementary Detailed Site Investigation report and PFAS Management Area Plan," the spokesperson said.

Precautionary health advice issued by the Department of Infrastructure, Transport, Regional Development and Communications is still in place.

Further information on this advice is available at: https://www.regional.gov.au/territories/jervis_bay/index.aspx

"A timeframe for the release of the findings will be determined in consultation with the WBACC Executive," the spokesperson said.

Further information is available at investigation website and the dedicated information line, 1800 987 618.