On Wednesday, the Great Lakes Water Authority will vote on a nearly 7% water rate increase and a 6% sewer increase.

Last year, GLWA proposed an even bigger hike — close to 8% for water — but public testimony at the hearing pushed the board to lower it. Wednesday’s hearing is another chance for residents to weigh in. What’s driving these increases — and why does water keep getting more expensive?

Suzanne Coffey is CEO of the Great Lakes Water Authority or GLWA. She spoke with The Metro‘s Robyn Vincent.

On The Metro, we also spoke about GLWA rate hikes — and why utility costs are rising — with Nick Schroek, dean of the University of Detroit Mercy School of Law. You can listen to that conversation here.

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The Great Lakes Water Authority has started building a new tunnel in southwest Detroit. The project will divert excess stormwater from a large sewer line along the Rouge River to a retention and treatment basin nearby.

Potential to address a longstanding problem

GLWA Chief Operating Officer Navid Mehram says the tunnel will reduce the risk of flooding. Additionally, it should mean fewer basement sewage backups during heavy rain. “We’re making an investment in our existing system by rerouting some flows, so that we can leverage an existing facility that wasn’t receiving all the flow it can treat,” Mehram says.

The tunnel will be almost 4,000 feet long and several feet wide. Nehram says GLWA expects to finish the job in 2028. “Our projects are very large,” he says. “This is a tunneling project, which is extremely complicated.” Besides reducing sewage backups, Mehram says the project will also make the system more resilient to heavy rain. “This not only provides us with water quality improvements along the Rouge River, but it can also provide a backup for our Water Resource Recovery Facility,” he says.

Who’s paying for it?

The project will cost $87 million. Mehram says GLWA will use both government grants and sewer rate revenues to pay for it. He says it will not increase customers’ bills.