Water supply has been suspended at a Haneda Airport terminal in Tokyo.
Japan Airport Terminal, the firm operating Haneda's terminal buildings, stopped water supply to Terminal 1 and Terminal 2 for domestic flights at around 9 a.m. on Wednesday.
The firm responded to complaints that tap water tasted salty.
The company examined water quality, and resumed water supply for Terminal 1 at around 11 a.m., after finding no problems with the water.
But the water supply remained suspended at Terminal 2 as of 7 p.m.
The stoppage has left restaurants closed and tap water at washbasins in restrooms unavailable. Officials have provided bottled water kept for emergency so people can wash their hands.
The transport ministry says salt content was detected from a water tank for Terminal 2, and efforts are under way to determine the cause.
The ministry's airport office says there has been no impact on flights to and from the airport.