Humboldt Park has experienced repeated basement flooding during heavy rain events due to Chicago's combined sewer system. Major events in 2008, 2011, 2013, and 2017 affected hundreds of homes simultaneously.
Combined sewer overflow (CSO) — storm water and sewage share the same pipes. When it rains heavily, raw sewage backs up through basement floor drains.
CSO flooding is Category 3 (sewage-contaminated) water — the most hazardous level. Full PPE, professional remediation, and disposal of all porous materials is required. DIY cleanup creates serious health risks.
Most Humboldt Park homeowners learned during flood events that standard policies exclude sewer backup. A $50–$100/year sewer backup rider is non-negotiable here — confirm you have it with a minimum $25,000 limit.
Category 3 (sewage) water requires full professional biohazard cleanup — costs run $8,000–$25,000 for a typical basement, significantly higher than clean water events
Chicago citywide average: $2,000 – $11,000
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