The new break or service leak is near the intersection of Communipaw Avenue and Berry Lane.
United Water crews are working to excavate the site to determine the extent of the repair.
Officials anticipate 11 residences, six commercial buildings and one church will be without water service until repairs can be completed.
Additionally, the boil water advisory issued as a precautionary measure for residents and businesses in the downtown area outside of Newport remains in effect until further notice.
Residents should boil tap water for at least one minute if it is to be used for drinking, brushing teeth or for pets. Water does not have to be boiled for the following activities: showering, washing dishes or clothes.
Overnight, United Water completed repairs to the main break that occurred on Coles Street between 3rd and 4th streets Wednesday.
Emergency crews worked throughout the night to restore water service to the affected residences.
Work continues to a main break that occurred on 3rd Street between Coles and Jersey avenues, with a water tanker truck is onsite to provide drinking water for affected residents.
As for the main break, United Water emergency crews pinpointed the 12-inch water main break at intersection of Grove Street and Grand Street. The location is in front of the Boys and Girls Club building.
"We understand that this leak presents an inconvenience to our customers," manager of operations John Hroncich said. "Our only priority is to restore full service back to the area. Employees are diligently working with the City and the Jersey City MUA to resolve the situation as quickly and safely as possible."