US supermarket's Stop and Shop, King Kullen Markets and A&P are facing the prospect of strikes in New York state.

The grocery workers union United Food and Commercial Workers Union Local 1500, New York state's largest grocery workers union, said it has begun warning local authorities of action.

A potential strike could affect over 150 supermarkets and 16,000 workers, the union warned in a statement.

"With a contract expiration date of June 26th, any potential job action could affect the 4th of July weekend for hundreds of thousands of customers," it said.

"We have a responsibility to inform the public and local law enforcement that you could see a widespread strike throughout the Five-Boroughs, Long Island, Westchester, Putnam and Dutchess Counties," said Patrick Purcell, spokesperson for UFCW Local 1500. "A strike in the supermarket industry will have a serious impact on communities in multiple ways. We intend to partner with elected officials and law enforcement to minimise the inconvenience."

A strike could be avoided if the companies would come to the table with respect for their employees and bargain in good faith," Purcell continued. "All they have talked about is cutting health benefits, cutting pensions, wage freezes, etc."