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How do I document mold or unsafe conditions in a rental?

Updated July 1, 2026United States

Short answer

Photograph and video the mold or hazard clearly and with the date visible, note where it is, how long it's been there, and any health effects, and report it to your landlord in writing right away asking for it to be fixed — keeping a copy. Record the likely cause too, like a leak or poor ventilation, and keep documenting as it changes. There's no single national standard for mold in rentals, and habitability rules vary by state and city, so check your local rules and consider a tenant-rights organization — and if it's serious or ignored, your local housing or health department may be able to inspect and create an official record.

With mold and safety hazards, the record does two jobs: it pushes for the repair, and it protects you if the condition — or your health — gets worse.

Step by step

  1. Photograph and video the problem, dated

    Capture the mold or hazard with wide shots for location and close-ups for detail, with the date recorded. Come back and re-photograph over time — showing that it's spreading or recurring is often more powerful than a single image.

  2. Write down the details

    Note where it is, when you first noticed it, and the likely cause if you can see one (a leak, condensation, a ventilation problem). Record any health effects for you or your household factually — and see a doctor for genuine health concerns; a medical note is its own kind of record.

  3. Report it to your landlord in writing — immediately

    Describe the problem, ask specifically for it to be assessed and remediated, and give a reasonable timeframe. Keep a copy. Written, dated notice is what most rules expect before anything else happens, and it starts the clock.

  4. Preserve evidence of the cause

    Photograph leaks, water stains, damaged materials and any related repair history. If mold keeps coming back after a surface clean, the underlying cause is the real issue — and documenting it matters.

  5. Consider an official inspection

    For serious or ignored problems, a local housing-code or health department may inspect and can cite violations, which creates an independent, official record. Look up your city or county office to see what's available.

  6. Be cautious with remedies

    As with any repair, options like withholding rent or repair-and-deduct depend on your state and city and carry real risk if used wrong — confirm local rules or get advice first. And don't disturb heavy mold yourself in a way that could be unsafe; that's a job to document and report, not to tackle blindly.

  7. Keep documenting until it's resolved

    Track every report, response, inspection and repair through to the end. Whether it finishes as a fix or a dispute, one organized record carries you through it.

Plain-English terms

Warranty of habitability
In many states, a landlord's duty to keep a rental livable and safe. Serious mold or hazards can breach it — but whether it applies, and what it covers, varies by state and city.
Remediation
Properly fixing the problem — for mold, that usually means addressing the moisture source and safely removing the growth, not just wiping the surface.
Code enforcement / health department
Local government offices that can inspect a rental for health and safety violations and document them officially. A complaint can create an independent record.
Constructive eviction
When conditions are so unsafe or unlivable that it's treated as if the landlord forced you out. The bar is high and the standard is state-specific.
Quiet enjoyment
Your right to use and enjoy your home. Serious, unaddressed hazards can interfere with it, though what follows from that depends on your state.

The tool for this

buildmyevidence

This guide tells you what to do. buildmyevidence does it with you — dated photos of the mold and how it spreads, your written reports, and the landlord's response, all in one case file. Every entry is dated for you.

  • Dated photos that show the problem — and how it spreads over time
  • Every written report and the landlord's response, kept together
  • Export a complete, organized record for an inspector, health department, or small claims
See buildmyevidence

Related questions

This is general information to help you keep your own records — not legal or medical advice. There is no single national mold standard for rentals and habitability rules vary by state and city — check your local rules, a tenant-rights organization, and a doctor for health concerns.