There are serious fears the privacy of everyday Australians could be in jeopardy under a data-sharing deal with the United States.

An intelligence treaty between the two nations will soon allow law enforcement agencies to share information. The agreement will give officers rapid access to US-hosted data to fight terrorism, child exploitation and human trafficking.

But NSW Council for Civil Liberties President, Josh Pallas said the agreement would gravely undermine privacy.

"At the end of the day our citizens shouldn't end up with less privacy rights and less human rights protections because of the implementation of this treaty," he told a parliamentary hearing on Wednesday.

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