CNN  — 

Virginia Tech engineering Professor Marc Edwards watched as water flowed from a garden hose in Enterprise, Louisiana. As he moved a jar to catch a sample, the color changed from clear to brown.

“When mine comes out, it comes out black,” Enterprise resident John Tiser said as he watched Edwards work.

Tiser, Enterprise’s newly appointed water board president, was giving Edwards a tour around this rural community in central Louisiana, where residents have struggled