Portland Water Bureau

TVWD receives about 72% of its water from the Portland Water Bureau. Portland water primarily comes from the Bull Run watershed and is piped to a 50-million gallon storage reservoir on Powell Butte, located on the east side of Portland. Currently, chlorine and ammonia are added to the water to disinfect it to meet federal drinking water standards. It is also adjusted for pH to make the water less corrosive to pipes.

The Portland Water Bureau also uses the Columbia South Shore Wellfield to augment the Bull Run supply. Drawn from 25 wells and four aquifers, it is capable of producing close to 100 million gallons per day (MGD).