In 2014, Flint switched water sources and failed to add corrosion-reducing phosphates, allowing lead from old pipes to leach into the water. Elevated levels of lead, a neurotoxin, were detected in children, and 12 people died in a Legionnaires' disease outbreak that experts suspect was linked to the improperly treated water.
"I'm very thankful to the Michigan audience for joining me in supporting this cause," Mars said in a statement. "Ongoing challenges remain years later for Flint residents, and it's important that we don't forget our brothers and sisters affected by this disaster."
Mars, who was born and raised in Hawaii, performed at the Palace of Auburn Hills during his sold-out 24K Magic World Tour. His latest album, "24K Magic," recently achieved double platinum status.