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Indoor air

Respond to a damp or mold-like area by finding the water source first

Surface cleaning cannot solve an active leak or persistent dampness, and sewage, HVAC contamination, hidden growth, or large areas need a different safety route.

Homeowner guidance with clear stop points

When it usually needs attention

Ongoing home-care habit

EPA directs prompt moisture control and bases cleanup decisions on source, extent, material, and occupants rather than a calendar.

When this guide applies

This is a condition-response card available to every occupied home; it does not assert that mold is present.

What to do

Record the wet or mold-like area's location, size, material, odor, and likely water event; stop a known safe clean-water source, keep vulnerable people away, and route the source before deciding whether any small-area cleanup is appropriate.

Applies when: This is a condition-response card available to every occupied home; it does not assert that mold is present.

Who should handle it: Residents may report and limit exposure; owners or managers correct building and equipment sources and arrange qualified cleanup when scope, contamination, tenancy, or shared systems require it.

Tools

  • Phone camera
  • Ruler or reference object used without touching contamination
  • Moisture-event log

Parts and supplies

  • Barrier or sign to keep people away
  • Container only for a small clean-water drip that is safe to approach

Safety gear

  • Avoid exposure as the first control
  • Cleanup PPE must match the reviewed EPA or qualified plan rather than a generic app suggestion

Before you start

  • Identify whether water may be sewage or floodwater
  • Consider children, respiratory sensitivity, immunocompromise, and anyone who should stay out

Power, water, or fuel shutoffs

  • Use only a known safe water shutoff
  • Do not touch wet electrical or HVAC equipment

Cleaner or chemical limits

Do not mix bleach, ammonia, disinfectant, fragrance, pesticide, paint, or degreaser; do not choose a cleaner until the source, material, extent, occupants, and EPA or professional route are known.

Stop and get help when

  • Use a professional route for sewage, floodwater, HVAC contamination, hidden or widespread growth, porous structural material, recurring water, vulnerable occupants, or unknown hazardous material
  • Leave immediate electrical, structural, or rapidly spreading water danger

Who to call: Use emergency help for immediate danger and the responsible owner plus qualified plumbing, envelope, HVAC, remediation, electrical, or public-health support for the source and cleanup scope.

Reviewed sources