The city's back-up water supply was activated after facility damage on Monday, Nov. 15.

COURTESY PHOTO: PWB - The fallen tree that damaged the Portland water supply facility.Portland switched its water supply system back to the Bull Run watershed after less that 36 hours on backup groundwater well on Nov. 17.

The initial switch was made on Nov. 15 after a falling tree damaged a treatment plant.

"Portlanders benefitted from the long-term planning and investment of their funds in a resilient water system. This is what you're paying for — reliable water service in uncertain times," said Portland Water Bureau Director Gabriel Solmer. "Every unexpected incident is an opportunity for us to learn and better prepare for the future."According to the Portland Water Bureau, the tree fell into the roof of the Lusted Hill treatment facility damaging the interior of the building, including corrosion treatment equipment. The bureau did not immediately know how long it would take for repairs. "Groundwater is one of our most powerful tools in planning for emergency supply response and climate change," Solmer said at the time. "We can expect more extreme weather events like the recent rains that have impacted the region. "Groundwater allows us to reliably provide water to people when severe storms impact the Bull Run Watershed or we have other supply disruptions."According to the bureau, the groundwater system is a high-quality water supply which meets or surpasses all federal and state drinking water regulations. The bureau serves water to almost a million people in the Portland area. The system includes two sources, 53 tanks and reservoirs and 2,200 miles of pipes.

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