PORTLAND The Portland Water Bureau decided to drain around 38 million gallons of drinking water after an 18-year-old man was caught urinating into one of the reservoirs, water bureau administrator David Shaff said Wednesday.

At 1.5 gallons for a toilet, that's about 2.5 million flushes.

A security camera caught Dallas Delynn, 18, urinating through an iron fence into Mt. Tabor Reservoir Number 5, Shaff said. Minutes later, Daniel McDonald, 18, and Trey McDaniel, 19, attempted to scale the fence, and one of them entered the reservoir.

A Portland Police Bureau officer and Portland Water Bureau ranger quickly responded, said bureau spokeswoman Jaymee Cuti. These actions forced the water bureau to immediately take the 50-million-gallon Mt. Tabor Reservoir 5 offline and test for possible contamination.

The three men were caught, cited for trespassing and banned from Mt. Tabor park for 30 days. Delynn was also cited for public urination.

Police were reviewing the surveillance video to determine if there should be additional charges.

Water quality samples were taken from the reservoir Wednesday, but test results won t be available until Thursday.

More: Updates from Portland Water Bureau

Shaff acknowledged the risk was slight, but said the bureau wanted to ensure that no tainted drinking water went out to the public.

Our customers have an expectation that their water is not deliberately contaminated. We have the ability to meet that expectation while minimizing public health concerns, said Shaff. The reality is our customers don't anticipate drinking water that's been contaminated by some yahoo who decided to pee into a reservoir.

But many say the choice to drain the reservoir was a costly and unnecessary one.

It seems like a large price to pay for everybody, a neighbor said Thursday.

Portland residents pay approximately one cent for every two gallons they drink. That equates to more than $175,000 worth of water literally flushed down the drain.

Still, Shaff backs up the decision.

Do you want to drink pee? No, you don't, he said.

In 2011, eight million gallons of water were dumped from Mt. Tabor Reservoir Number 1 after a 22-year-old Molalla man admitted to urinating in it.

Related: City defends dumping urine-tainted Tabor water

In that case, it cost the water bureau $32,700 rate-payer dollars to drain the reservoir, which caused a wave of backlash from many who said it was an unnecessary response.

Some complained that animals sometimes fall into the reservoir and die, without any such action taken.

In defending that 2011 decision, Shaff said, I think part of it is just that general yuck factor of, 'Yes, we have birds on there all the time but we don't have people peeing in it all the time.'

He added that if there was a drought occurring, he probably would've made a different decision.

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