Millions of gallons of drinking water are being flushed from a Portland, Oregon reservoir after a man urinated in it.

City officials say three teens were seen at the reservoir early Wednesday morning and one was filmed urinating into the water through a fence.

Another of the teens got into a secure area around the reservoir and it's not clear what he did.

The 50-million-gallon reservoir has been taken off line and is being tested for contamination.

Test results are expected Thursday.