Chicago's combined sewers back up fast during summer storms. Here's how proactive rodding, catch basin cleaning, and floor drain upkeep keep water out of your basement units.
Most of Chicago runs on a combined sewer system, meaning stormwater and wastewater share the same pipes. That design works fine on a dry day, but when a fast-moving summer thunderstorm dumps two inches of rain in an hour, the system fills up quickly and the overflow has to go somewhere. In older buildings across Logan Square, Pilsen, and Rogers Park, that somewhere is often the lowest drain in the building: a basement floor drain, a laundry sink, or a garden-unit toilet.
For landlords, a single backup is more than a mess. It can mean displaced tenants, ruined flooring, mold remediation, and a hard conversation about habitability under Chicago's residential ordinance. The good news is that backups are largely preventable. The buildings that flood are usually the ones whose drains were already partly clogged before the storm ever arrived.
Before you can maintain a system, you need to know what you have. Chicago's housing stock is varied, and drainage layouts differ from block to block. A vintage greystone in Hyde Park might still rely on a gravity sewer line that runs straight out to the city main, while a two-flat in Bucktown may have an overhead sewer and an ejector pit installed after a past flood.
Walk your basement and locate every floor drain, the catch basin if you have one, any cleanout caps, and the ejector or sump pit. Note whether there's a backwater valve already in place. Snap photos and keep a simple diagram in your building file. When a drain pro arrives during an emergency, knowing exactly where everything sits saves expensive time and helps you target the right line before, not after, water is rising.
Rodding, the process of running a powered cable with a cutting head through your sewer line, clears the roots, grease, and sediment that build up silently over a year. Parkway trees are the usual culprit in leafy neighborhoods like Ravenswood and Andersonville, where decades-old root systems push into hairline cracks in clay sewer tile and keep growing until they choke the pipe.
The ideal time to rod a main line is late spring or early summer, before the heaviest storm season. Rodding a line that's already 70 percent blocked is the difference between a clear pipe and a flooded basement the next time a downpour hits. For most multi-unit buildings, a once-a-year rodding of the main sewer line is a small, predictable cost that prevents a large, unpredictable one. Buildings with known root problems may need it twice.
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