Fire and Rescue Hazardous Materials officers are heading to the northern end of Stockton Beach where a canister believed to contain aluminium phosphide has washed ashore.
The substance used as rat poison, if exposed to air and water can have serious health effects on people.
The suspect canisters are believed to part of a cargo lost from a ship off the Queensland coast.
Big seas have seen similar canisters wash ashore through the year.
A fisherman at Tuncurry on the Mid-North Coast was hospitalised when he inhaled fumes after opening one of the canisters earlier this year.
The HAZMAT team is using a 4WD to reach the site six kilometres from the Birubi Surf Club.
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