Long before Flint Michigan's water problems became a national news story, a substantial 9 million American households identified their primary source of water as unsafe to drink. We know this thanks to the American Housing Survey, which asks respondents whether their primary source of water is safe for drinking. This is the percentage of households with water not safe to drink (excluding households whose primary source is commercial bottled water)...
Primary source of water is unsafe to drink
Total households: 8%
Below poverty: 12%
Central city: 9%
Source: Census Bureau, 2013 American Housing Survey