Some Newark residents are getting bottled water after elevated lead levels were found.
The city has given thousands of filters to residents in homes with lead service lines.
But the US Environmental Protection Agency said recent tests showed drinking water in a few locations was still testing high for lead despite the filters.
Water was available at four locations in the city on Monday.
An environmental group sued the city last year, saying Newark’s water has dangerously high lead levels and alleging that the city has failed to conduct adequate monitoring.
The Natural Resources Defense Council said on Monday it is seeking a court order to force the city to go door-to-door to instruct residents on how to use the filters.