Water was flowing back into Bayonne by Thursday evening following a water main break earlier in the afternoon, authorities said.
United Water, which serves tens of thousands of customers in New Jersey and operates in more than a dozen other states, said there was a break on the line coming into the city from Kearny around noon.
A reverse 911 call went out to alert residents about the situation and emergency crews were dispatched to make repairs and there was no indication as to when those repairs might be complete.
The mayor's office said a secondary water supply line based in Jersey City was switched to Bayonne. Water was flowing back into the city by 6:30 p.m., officials said.
One of the four tankers Bergen County received from the federal government was headed to one of the city's hospitals with water.
A boil water advisory is in effect for the next 24 hours.