Illinois homeowner guide
From move-in basics to emergency response: everything an Illinois homeowner needs to know, specific to this state's climate, hazards, and conditions.
1 Basic ownership
Illinois homeownership spans Chicago's dense urban environment through the central prairie to the southern tip near Missouri. Tornado risk is significant statewide, Chicago faces severe lake storms and cold, and the Illinois and Mississippi rivers create major flood risk throughout the state.
Critical systems to locate
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Main water shutoff
At the meter or wall entry. Chicago and suburban homes often have the shutoff in the basement near where the water main enters. Know the location; Illinois freeze events and pipe bursts require fast shutoff action.
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Gas shutoff and utility contacts
Nicor Gas serves northern Illinois; Ameren Illinois serves central and southern regions. Nicor emergency: 1-888-642-6748. Ameren: 1-800-755-5000. Know your utility and meter shutoff location.
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Basement and storm shelter
Illinois has significant tornado risk statewide. Most downstate Illinois homes have basements. Chicago area: know your safest interior room on the lowest floor; apartment buildings don't have basements but the center stairwell core is the most structurally protected area.
Monthly priorities
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HVAC maintenance
Chicago's -20°F winter lows and 100°F summer highs run HVAC systems at both extremes. Service in fall and spring. Replace filters every 1-2 months during peak seasons.
Pro recommended: HVAC Technician
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Foundation and water management
Chicago-area clay soils expand and contract with moisture. Grade away from the foundation, keep gutters clean, and extend downspouts. Illinois River flooding communities need annual review of flood barriers and sump pump condition.
2 Seasonal maintenance
Illinois maintenance centers on tornado season (spring to summer), Chicago lake storm preparation (fall/winter), and river flood monitoring (spring).
Spring (March to May): tornado and flood season
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Illinois tornado risk
Illinois averages 50+ tornadoes per year. Central and southern Illinois have higher risk. Chicago has experienced multiple tornado events including a suburban outbreak in 1990. NOAA weather radio and shelter location are essential.
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Illinois River flood monitoring
The Illinois River system floods most years during spring rain. Peoria, Pekin, Beardstown, and downstate communities along the Illinois and Mississippi rivers need to monitor river gauges and have flood barriers and sump pumps ready.
Fall/Winter (September to March): Chicago cold prep
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Chicago 'Polar Vortex' events
Chicago regularly experiences -20°F to -30°F wind chill events. In January 2019, Chicago was colder than Antarctica. Insulate all exposed pipes in unheated spaces, maintain heating fuel reserves, and have a backup heat plan.
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Lake Michigan shore storm prep
Chicago's lake shore experiences severe November-March storms with 30-40 mph winds and 20-foot waves. Lakefront properties need storm preparations similar to coastal properties. Lake Shore Drive was closed for days during the 2019 polar vortex.
3 Preventive protection
Illinois preventive priorities: radon mitigation for northern IL, flood insurance for river valley communities, and freeze protection for Chicago's extreme cold events.
Radon mitigation
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Northern and central Illinois radon
Many Illinois counties have elevated radon levels, particularly in the Chicago suburbs and central Illinois. Test within 90 days of move-in. IEMA (Illinois Emergency Management Agency) provides radon testing resources.
Pro recommended: Certified Radon Mitigation Contractor
Flood insurance
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River communities need flood coverage
Illinois River, Mississippi River, and Chicago River floodplain properties need NFIP or private flood insurance. Standard homeowners insurance does not cover flooding.
4 Weather preparedness
Illinois faces tornadoes, blizzards, lake storms, and river flooding. Chicago's dense population adds complexity to every weather emergency.
Tornado preparedness
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Shelter location for Chicago apartments
High-rise residents: do not use elevators. Go to a lower floor interior hallway or stairwell during a tornado warning. The 1990 Plainfield F5 (suburban Chicago) and numerous subsequent tornadoes show the risk is real.
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Downstate basement shelter
Central and southern Illinois: use the basement. Lowest floor, away from windows. NOAA weather radio with audible alarm.
5 Emergency response
Illinois emergency scenarios: tornado, polar vortex pipe freeze, flooding, and extended power outages from ice storms.
Tornado warning response
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Shelter immediately
Warning = shelter now. Basement or lowest interior room. High-rise: interior core, lower floor. Wait for NWS Chicago, NWS Lincoln, or NWS Paducah all-clear.
Burst pipe
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Shut off and drain
Main water off at the meter. Open all faucets. Photograph damage. After a polar vortex event, Chicago-area plumber wait times are 48-72 hours.
Basement flooding
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Storm sewer backup and groundwater
Do not enter if electrical equipment is submerged. Call ComEd (1-800-334-7661) or Ameren Illinois (1-800-755-5000) to disconnect at the meter. Pump out, dry immediately. Chicago's summer humidity accelerates mold.
Power outage
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Chicago cold and summer heat outages
ComEd outages in cold are dangerous within hours. ComEd: 1-800-334-7661. Ameren Illinois: 1-800-755-5000. Generator outside only, 20 feet from windows. Know your nearest warming or cooling center.
Gas leak
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Evacuate and call from outside
Rotten egg smell: everyone out. Leave door open. Call 911. Nicor Gas: 1-888-642-6748. Ameren Illinois Gas: 1-800-755-5000. Do not re-enter until cleared.
House fire: get out fast
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Two exits, meeting place, never re-enter
Two ways out of every room. Specific outdoor meeting place. Crawl under smoke. Call 911. Never go back inside.