Thanks to the ongoing heat wave, Metro is again allowing passengers to carry and consume bottled water on trains, buses and access vehicles through the close of the system Sunday night.

The exception to the transit authority's no-drinking policy applies to water only, Metro said in a news release.

This is the second time in as many weeks that extreme heat has caused Metro to allow bottled water into the system.

The Fairfax Connector is doing the same. They're allowing passengers to carry and drink water through closing on Saturday. 

The exception applies only to water. Connector is encouraging passengers to use water containers that can be tightly secured and use trash and recycling bins to dispose of water bottles and waste.