Winter Power Outage in Chicago: How to Protect Your Plumbing and Sump Pump

A Winter Power Outage in Chicago Shuts Down More of Your Plumbing Than You’d Expect, and the Cold Doesn’t Wait for the Power to Come Back

 

An outage in a Chicago winter hits your plumbing three ways at once. Pumps stop: the sump pump, a basement ejector pump, a private well pump. Heat stops, which puts every pipe along an exterior wall on a clock. And people start improvising with generators and heaters in ways that can be more dangerous than the outage. This guide covers what stops working, how to protect a basement from flooding, how to use a generator without poisoning your household, what to do about pipes and the water heater if the house gets cold, and what to check when the power returns. It’s built on federal safety guidance and university extension recommendations, and it points to our other guides where a topic deserves more room than a paragraph.

 

First, Know What in Your House Needs Power

 

Most homeowners can’t say offhand which parts of their plumbing stop working without electricity. Take ten minutes and write the list down for your own house:

 

• Sump pump and its alarm, if it has one.
• Ejector (sewage) pump, if a basement bathroom, laundry, or bar sink drains to a pit rather than by gravity.
• Well pump, if you’re on a private well. No power means no water pressure.
• Water heater. An electric heater stops heating. A gas heater depends on its design: a standing-pilot model can keep working, while one with electronic ignition or a power vent needs electricity.
• Heating system. Your furnace or boiler and its circulators are what keep the pipes from freezing, so a heating outage is a plumbing problem too.
• Septic system pumps or alarms, if your septic system has them.

 

Know where the main water shutoff is and which breakers feed these items before the lights go out, not after.

 

The Sump Pump: The Outage Failure That Floods Basements

 

A sump pump with no power doesn’t pump, and outages often arrive with the same weather that fills the pit. NOAA hydrology research notes that ice in soil reduces its permeability, and National Weather Service forecasters list frozen ground among the conditions that raise basement flooding risk when heavy rain or snowmelt arrives. A thaw or a rain-on-snow event can send water to your foundation drains just as an ice storm takes the power out.

 

A battery backup runs the pump on a battery when the power fails. It has limits worth understanding: how long it lasts depends on the battery’s size and condition and on how fast water is entering the pit, so there is no universal number. Ask whoever installs it what the expected runtime is for your pit, and test it on a schedule. Our sump pump battery backup installation covers adding one.

 

Power isn’t the only winter failure. A backup pump does nothing if the discharge line is frozen, which is a separate problem we cover in our guide to a frozen sump pump discharge line in Chicago.

 

If You Have an Ejector Pump

 

An ejector pump lifts wastewater from below-grade fixtures up to the sewer line, and it needs electricity to do it. With the power out, wastewater from those fixtures collects in the pit, which has limited room. Until power returns, treat the basement bathroom, laundry, and any sink that drains to the pit as out of service. If you’re not sure whether you have a sump pump, an ejector pump, or both, our guide on sump pumps versus ejector pumps explains the difference.

 

Generators: The Risk That Kills People

 

Running a sump pump from a generator is common, and so are the mistakes that go with it. The Consumer Product Safety Commission’s generator safety alert is blunt:

 

• Never run a generator inside a home, garage, crawlspace, or shed, even with fans running or doors and windows open. Deadly carbon monoxide can build up quickly in those spaces and linger for hours after the generator is shut off.

 

• Use it outside only, at least 20 feet from doors, windows, and vents, which is the distance the CDC gives.

 

• Never plug a generator into a wall outlet to power the house wiring. This is called backfeeding, and it can electrocute utility workers and neighbors served by the same transformer.

 

The CDC also recommends a battery-operated or battery-backup carbon monoxide alarm. If you want a generator to run a sump pump safely, the legitimate route is a transfer switch or interlock installed by a licensed electrician, so the pump stays on its normal circuit and the generator stays outside. Never burn charcoal indoors for heat or cooking either, for the same reason.

 

When the Heat Goes Out Too: Protecting the Pipes

 

How much to do depends on how long the heat is likely to stay off.

 

A few hours: slow the cold down

 

Open the cabinet doors under sinks on exterior walls so room air reaches the pipes, and let faucets on exposed lines trickle. Pipes in exterior walls, unheated spaces, and floors over garages are the first to be at risk. Know where your main shutoff is. Our hard freeze countdown covers the rest of the house in the 48 hours before a cold snap.

 

Several days: draining the system

 

If the house will be without heat for an extended stretch, university extension guidance goes further. Purdue’s guidance for a winter power failure says to shut off the water at the main valve or turn off the well pump, open all the faucets until they drain completely, drain water-using appliances, and disconnect a water softener so its pipes and controls can drain. It also says not to put antifreeze in those appliances. University of Wisconsin–Extension guidance adds two points: turn the water heater off before the system is drained, because an explosion could result if the heater is left on without water in it, and insulate any pipes that can’t be drained. Open faucets on the lower level first, then the upper level. The Wisconsin material also advises getting a professional for plumbing work whenever possible, and our emergency plumbing services can help if you’d rather not do this yourself.

 

If a pipe freezes anyway

 

Shut off the water supply, open the faucet on the frozen section, and warm the pipe with a heat lamp, blow dryer, or portable heater. Don’t use boiling water, a propane torch, or any open flame. If a pipe has already split, turn off its water supply immediately. Our pipe thawing service and burst pipe services handle both.

 

Your Water Heater in an Outage

 

The tank holds a reserve of water, typically somewhere between 30 and 80 gallons depending on its size, and several university extension sources point to it as an emergency supply. To draw from it, turn off the electricity or gas to the heater first, close the cold-water inlet valve, open a hot faucet somewhere in the house to let air in, and then draw water from the drain valve at the bottom of the tank. Expect some sediment; if you’re unsure about the water, treat it like any stored water of uncertain quality. Our guide on what causes water heater sediment explains why it’s there.

 

The more important rule comes when power returns: don’t turn an electric water heater back on until the tank is full of water. Extension guidance warns that powering an empty or partly empty heater can burn out its elements. If your heater misbehaves after an outage, our water heater services team can check it.

 

No Water at All: Wells, Toilets, and Drinking Water

 

On a private well, no power means no water, because the pump is electric. Homes on municipal water are less likely to lose pressure in a short outage, but check with your utility. University extension and emergency-management guidance consistently recommends storing at least one gallon of water per person per day, enough for at least three days, and a Chicago winter is a good reason to have that supply on hand before the storm. If the water is out but the drains work, you can still flush a toilet by pouring a bucket of water into the bowl.

 

When the Power Comes Back

 

• Check the sump pump. Confirm it starts and that water leaves through the outlet. A pit that filled during the outage may need a moment to catch up.

 

• Restore water slowly if you drained the system. Close the drains, open the main valve slowly with a faucet open, and check fittings and pipes for leaks before you leave the house.

 

• Wait to turn the water heater on until the tank is full.

 

• Look for leaks as the house warms. A pipe can split while frozen and only start leaking as it thaws. Check ceilings, walls under bathrooms, and basements for stains and dripping.

 

• Test your carbon monoxide alarms if you ran a generator.

 

• Call a plumber for anything that looks wrong rather than waiting to see if it gets worse.

 

Prepare Before the Next Outage

 

• Install or test a sump pump battery backup, and confirm your discharge line is clear of ice.

 

• If you want generator power, talk to a licensed electrician about a transfer switch or interlock. Don’t improvise.

 

• Put battery-operated carbon monoxide alarms on every level.

 

• Store at least a three-day supply of drinking water and keep a bucket for flushing.

 

• Write down which plumbing items depend on power, and where the main shutoff and breakers are.

 

• Save a plumber’s number where you can find it in the dark.

 

Frequently Asked Questions

 

How long will a sump pump battery backup run?

It depends on the battery’s size and condition and on how fast water is entering the pit, so there is no universal answer. Ask the installer for the expected runtime for your pit, and test the system on a schedule.

 

Can I run my sump pump on a generator?

Yes, but safely: keep the generator outside, at least 20 feet from doors, windows, and vents, and never backfeed through a wall outlet. The proper way to connect it to a pump is a transfer switch or interlock installed by a licensed electrician.

 

Can I drink the water in my water heater tank?

University extension sources list it as an emergency supply. Turn off the power or gas to the heater first, close the cold-water inlet, open a hot faucet, and draw from the drain valve. Expect some sediment, and treat the water like any stored water of uncertain quality.

 

When should I drain my plumbing during an outage?

When the heat is likely to be off for an extended time and the house is getting cold, especially if pipes run along exterior walls or through unheated spaces. Extension guidance describes how to do it, and a plumber can do it for you.

 

Can I turn my electric water heater on as soon as the power returns?

Not until the tank is full of water. Powering an empty or partly empty heater can burn out its elements.

 

Do my toilets work without power?

If you’re on municipal water and the supply is still on, a standard toilet flushes by gravity. If the water is out, pour a bucket of water into the bowl. Fixtures that drain to an ejector pump can’t discharge without power, so avoid using them until it returns.

 

Plan the Outage Before the Storm

 

The plumbing problems that follow a winter outage come in a predictable order: a pit that floods, a pipe that freezes, a heater that’s damaged on restart, and a household exposed to carbon monoxide. Each one is easier to prevent than to repair. If you’d like your sump pump, backup, and pipes checked before the next storm, our sump pump services team will go through the system with you.

 

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