DigIndy Tunnel System now fully operational

INDIANAPOLIS (WISH) — After 14 years of construction, Indianapolis residents have finally reached the end of the tunnel — the DigIndy Tunnel, that is.

On Thursday, Citizens Energy Group announced that the 28-mile tunnel, located 250 feet beneath Indianapolis, is fully operational and meets all federal and state regulations. The tunnel is designed to capture and divert sewer overflows — an estimated 5 billion gallons annually — away from local rivers and streams and into water treatment facilities.

A diagram showing sewer overflows in dry and wet weather. (Provided Diagram/EPA)

Construction on the $2 billion DigIndy Tunnel System began in 2012 and wrapped up in October 2025.

“This project began as a vision, became a challenge, and now stands as a testament to what our community can achieve together,” Jeffrey Harrison, president and CEO of Citizens Energy Group, said in a release.

Completion of the DigIndy construction means “visible improvements” to water quality throughout Indianapolis, most notably in the city’s rivers and streams.