Thanks to a careless teenager, the city of Portland, Ore., was forced to dump almost 38 million gallons of drinking water after the teen was caught on camera urinating in a water reservoir.

Surveillance footage shows three teens hanging out at the Mount Tabor Reservoir No. 5 around 1:00 a.m. Wednesday. Eventually, a 19-year-old wearing a hoodie approached the iron fence sounding the 50-million-gallon kidney-shaped reservoir and urinated in it.

The trio was then arrested and the reservoir was taken offline for testing. The Portland Water Bureau also dumped 38 million gallons of drinking water, said administrator David Shaff.

"Our customers have an expectation that their water is not deliberately contaminated," he said, according to CNN.

"The basic commandment of the Water Bureau is to provide clean, cold and constant water to its customers," Shaff said. "And the premise behind that is we don't have pee in it."

All three teens received citations for trespassing and one was cited for public urination.

Shaff called the act "stupid" and told the Oregonian newspaper that the unidentified teen knew exactly what he was doing.

"It's stupid. You can see the sign that says: 'This is your drinking water. Don't spit, throw, toss anything in it.' He's four feet away from that sign," he said.

A similar incident took place back in June 2011 when surveillance cameras caught a man urinating into an 8-million gallon reservoir. As a result, the city drained a 7.5 million-gallon reservoir at Mount Tabor in southeast Portland.