Nov. 13 on The Story: Thousands of Oregonians in Umatilla and north Morrow counties rely on private wells for drinking water, tapping into a massive underground aquifer. But pollution has steadily contaminated that groundwater source in recent decades, turning what was once safe water into a potentially toxic supply. KGW's The Story travelled to eastern Oregon to speak with residents and learn more about the problem. A large share of those impacted are low-income people. Many do not speak English. They may not have political power, but they share a belief that the water has made them sick — even if they can't prove it. Part 1 of 4 of this story focuses on the health impacts for longtime residents who have only recently learned that their wells have become polluted. Watch more The Story videos: http://bit.ly/watchTheStory Follow The Story on Twitter: https://twitter.com/TheStoryKGW Follow The Story on Instagram: https://instagram.com/thestorykgw