A failed sump pump can flood a basement unit in under an hour. Here's how Chicago landlords and property managers should inspect, test, and service pumps before storm season.
Chicago's combined sewer system was built to handle a slower, drier century. Today's lake-effect downpours regularly overwhelm storm drains in low-lying neighborhoods, and basement and garden-level units take the hit first. A single failed sump pump can flood a finished basement unit in Rogers Park, Logan Square, or Lincoln Park in under an hour, ruining flooring, drywall, appliances, and tenant belongings.\n\nFor landlords, the cost of a backup goes well beyond water damage. Habitability complaints, displaced tenants, mold remediation, and insurance disputes all stack up quickly. The Illinois Residential Landlord and Tenant Ordinance requires units to remain habitable, and a flooded apartment from a known-defective pump is the kind of failure a tenant attorney builds a case around. Spring maintenance is the cheap part of this equation.
A sump pump sits in a pit at the lowest point of the basement, usually in a back corner. Groundwater and stormwater drain into the pit through perimeter drain tile or footing drains, raising a float switch as the water level climbs. Once the switch trips, the motor kicks on and pushes water out through a discharge pipe to the exterior, where it should drain away from the foundation.\n\nMost Chicago rental buildings use a submersible pump rated between one-third and one-half horsepower, which is enough for typical groundwater but can be undersized for a true downpour. In greystones and vintage two-flats in Wicker Park, Bucktown, and Old Town, the pit, pipe, and check valve are often original to a 1990s waterproofing job, which means many systems are now well past their service life of seven to ten years.
Before the late-May and June storm cycle ramps up, every basement-unit building needs a hands-on inspection. Pull the lid on the sump pit and look inside. The pit should be reasonably clean — sediment, gravel, or debris on the float switch will hang it up and stop the pump from starting.\n\nNext, pour a five-gallon bucket of water into the pit. The pump should start within a few seconds, run for ten to thirty seconds, and shut off cleanly when the float drops. Listen for grinding, rattling, or a motor that hums but won't pump. Walk outside and confirm the discharge line is actually moving water, that it exits at least four to six feet from the foundation, and that the splash block or extension hasn't been kicked aside by landscapers. Finish by testing the check valve by listening for water flowing back into the pit when the pump shuts off — if you hear a steady trickle, the valve is failing.
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