To thoroughly disinfect a basement following a raw sewage overflow, start by extracting all standing water, removing contaminated porous materials (such as carpets and ruined drywall), and discarding un-sanitizable items. Scrub all hard non-porous surfaces—including concrete floors and framing—using a strong solution of household chlorine bleach mixed with water (one cup of bleach per gallon) or an EPA-registered hospital-grade disinfectant. Callout type="warning" title="Hygiene Warning": Wear heavy protective gear and ensure continuous ventilation during cleanup. Verification: Run industrial dehumidifiers for 48 to 72 hours to dry out the structural framing completely.
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