one year before she found out the water was tainted, so he was never tested for pfas. >> every night you try and fall asleep and wonder is that what did it. >> reporter: the state of michigan is also suing wolverine. 3m told cnn it regularly and proactively examines the environmental impact of our products and has invested more than $200 million globally on pfas remediation efforts. >> is this the largest environmental crisis this state has seen? >> in terms of residential water drinking impacts, yes. >> 1,300 miles away every day a dairy farm milks 1,800 cows and every day for nearly a year he dumps it all down the drain. >> that'd be about 1,000 gallons