I guess, we as a region don't have enough money to tackle these issues.

In 2009, the $1.5 billion Upper Rouge CSO Tunnel project was postponed

According to below article:

"The project is designed to reduce the frequency
of 17 CSOs on the Northwest Interceptor [[NWI)
and tributary sewers to the Middle Branch of
the Rouge River from approximately 50 events a
year to less than one a year."


Funding crisis cripples Detroit tunnel projects

https://www.tunneltalk.com/Upper-Rou...Rouge-CSO1.php