Some 6.7 % of homes tested in Flint have dangerously high lead levels in their tap water, according to state data.

They're spread across all parts of the city, as can be seen on this Google Map created using the latest data available from the State of Michigan's website.

The map illustrates 666 addresses with levels of more than 15 parts per billion of lead found the water. That's out of 9,940 tests taken from September through Feb. 13 (an additional entry with high lead levels didn't link to a valid address). The state has been collecting water samples from residents who voluntarily submit them to learn how much lead is in their tap water.

High concentrations of lead in water can cause permanent brain damage in children and other health issues. Lead numbers have been elevated in the city since a temporary water-source switch in spring 2014 to the Flint River. As the dangers have gained attention, many residents have resorted to bottled water for eating, cooking and bathing.