A boil-water advisory in Virginia's capital will remain in place at least until Saturday morning, officials said, leaving residents without drinkable tap water for a fourth day following an outage at the city's treatment facility.

Results from the first of two water tests are expected to come in on Friday afternoon around 3 p.m., Richmond Mayor Danny Avula said at a Friday morning press conference. While results of tests can take about 24 hours to complete,

Richmond Mayor Danny Avula shared Thursday that all nine zones served by Richmond’s water system are fully pressurized, and that the boil water advisory could be lifted by Friday or Saturday, pending water quality tests.