"Allaire found the amount of violations varied by year, affecting as many as 45 million people in some years, representing about 28% of the U.S. population."
https://www.usatoday.com/story/news/health/2018/02/12/tens-m...
"Tainted tap water isn’t just a problem in Flint, Michigan. In any given year from 1982 to 2015, somewhere between 9 million and 45 million Americans got their drinking water from a source that was in violation of the Safe Drinking Water Act, according to a new study"
http://www.sciencemag.org/news/2018/02/millions-americans-dr...