A chemical spill in West Virginia has left thousands in the West Virginia capital of Charleston and surrounding counties without drinking water. The 4-Methylcyclohexane Methanol spill took place yesterday on the Elk River just upriver from a West Virginia American Water facility.

The Waterkeeper Alliance quickly illustrated affected areas with this map:

Mapbox.com allows you to combine custom basemaps with multiple data layers and hand-drawn annotations. From there, we use on-the-fly compositing to deliver highly custom, highly performant maps.