The residents of a city in the Dallas–Fort Worth metropolitan area in Texas have been warned not to use water from the faucet after a foaming agent was detected in the water supply.

Grand Prairie citizens queued up on Tuesday night to collect water from a distribution center set up in the city hall, after being told not to use their usual water supply, according to Fox 4.

In a post on Facebook by the city’s Municipal Government at 9 p.m., authorities said, “Crews are currently investigating the issue and working to isolate the affected area. If you live north of I20 in Grand Prairie, please avoid using water other than for flushing until further notice. The City will have bottled water distribution stations.”