Basement Flooding in Chicago, IL: Causes & Fixes

Why is water coming into my basement?Basement flooding in Chicago usually comes from one of three directions: combined sewers backing up through floor drains during heavy rain, groundwater a sump pump can’t keep up with, or a plumbing failure inside the house. Figuring out which one is responsible decides the fix, and many Chicago homes need protection against more than one.

Act now

Standing water near electrical equipment is dangerous, and every hour of flooding increases damage. Act immediately.

Call (866) 417-0220

Why it happens in Chicago

Combined sewer surcharge

Heavy storms fill the combined system and push water back up basement floor drains.

Sump pump failure

Stuck floats, power outages and aging pumps fail during spring and summer storms.

Cracked private sewer

Root-filled or cracked clay laterals block flow and also let groundwater in.

Old supply lines and water heaters

Basement water heaters and aging supply connections are frequent leak sources.

Signs to watch for

Water around the sump pit or floor edges
Water coming up through the floor drain
Water near the water heater or washer
Damp walls after rain
Musty smell and efflorescence on walls

Emergency, or can it wait?

Call right away if…

Water near outlets, the panel or appliances
Sewage in the basement
Water rising during a storm

Usually OK to schedule if…

Minor dampness after rain with no standing water

What Chicago homeowners can check first

Is the water clean (groundwater) or dirty (sewer)?
Did it start during heavy rain?
Is the sump pump running and emptying the pit?
Is there a backwater valve or overhead sewer?
Is water coming from the floor drain, walls or a fixture?
Did it start during heavy rain?
Is the sump pump running?

Unfinished basement with exposed pipes — Stock photo: Oleksandr Chernobai / Unsplash

How our plumbers fix it

Test the sump pump, float and check valve.
Inspect the floor drain and main line.
Check supply lines, water heater and washer hoses.
Evaluate downspouts and grading.

Basement Flooding in Chicago: questions

What protects a Chicago basement from sewer backups?

A backwater valve, an overhead sewer conversion or a flood control system keep public sewer water out of basement drains. A plumber can tell which suits your home.

Does homeowners insurance cover Chicago basement flooding?

Sewer backup and groundwater usually require a separate endorsement or flood coverage. Check your policy before storm season.

Is basement floodwater in Chicago safe to clean up myself?

If it came from the sewer, treat it as contaminated: wear protection, keep people and pets away, and discard soaked porous materials.

Next steps

Sump Pump Repair in ChicagoSump pump repair restores a basement or crawl space pump that collects groundwater in a pit and pumps it away from the foundation.Sump Pump InstallationSump pump installation involves a sealed or lidded basin set into the floor, a properly sized pump, a check valve, discharge piping routed away from the foundation, and a dedicated outlet.Main Sewer Line CleaningThe main sewer line carries all of a home's wastewater to the city sewer or septic tank.Emergency PlumbingEmergency plumbing is urgent repair work for a problem that is actively causing water damage, a sanitation hazard, a gas risk or a total loss of water or drainage in a home.

National guide: Basement Flooding · Plumbing in Chicago · Basement Flooding in Indianapolis