I believe we have a new normal, my friend.
MWRDGC needs to get its shit (pun intended) together with the treatments plants here. The boondoggle "deep tunnel" project is years past due and billions over budget. That project was ill-advised from the start.
What Chicago really needed was to separate storm and sanitary sewers. The existing combination sewers could be used for stormwater and then new sanitary mains could be direct-drilled along both sides of each street and the services connected.
How this would work is that the new sanitary mains would be routed to the treatment plants and the existing combo sewers would be diverted to the deep tunnels, for storage and pre-treatment, to remove pollutants (oil, fertilizer, etc.).
I have a plan for this, which I presented to our local rep, but it has not gone anywhere. It makes too much sense, I reckon.