Mold - NYC Health

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Mold

Clean Up Safely After a Flood

Flood water may contain bacteria, petroleum and chemicals. Mold can grow in a flooded home that is not properly cleaned and dried out.

Learn how to safely clean your home after a flood:

Healthy Homes: Mold (PDF)

Other Languages: Español | 繁體中文

CDC Infographic: Eight Tips to Clean Up Mold

Guidance for Building Owners and Property Managers After Flooding
Severe Weather Resources

Mold (mildew), mushrooms and yeast are all types of fungi. Fungi are found both indoors and outdoors. Hundreds of different kinds of mold are commonly found in the United States and New York City.

Exposure to mold can cause or worsen asthma symptoms and allergies, such as hay fever. People who are allergic or sensitive to mold may experience congestion, runny nose, coughing and trouble breathing.

Some people are at risk for more severe reactions to mold, such as fever and shortness of breath. This includes people who are exposed to large amounts of mold at work such as agricultural workers and building demolition workers. People who have had or are undergoing certain medical procedures, such as bone marrow or organ transplants and chemotherapy, are also at risk. Health symptoms usually disappear after the mold has been removed.

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Identifying Mold

Mold can be different colors, including gray, black, green, yellow and orange. It may look furry, slimy or powdery. Some mold has a musty, stale or earthy smell.

Mold usually grows in wet or damp places. It can grow on paper, fabric, wallpaper glue, sheetrock, wood, soap scum, leather and other surfaces. It can grow where there is water, high humidity or damp conditions. Mold grows faster in warm temperatures and high humidity.

Exposure to Mold

You can breathe in mold particles if mold is disturbed or damaged. You can also breathe in tiny spores (similar to seeds) that mold may release into the air. Mold can get on your skin if you touch it. You can swallow mold if you eat moldy or spoiled food. If you think that you have symptoms related to mold exposure, you should see a health care provider.

Building Requirements

Owners of buildings with three or more apartments, or buildings of any size where a tenant has been diagnosed with moderate or severe persistent asthma, are required to keep tenants’ homes free of mold. This includes safely repairing underlying problems like water leaks.

If the area of mold to be fixed is more than 10 square feet in buildings with 10 or more apartments, or in buildings with 25,000 or more square feet of non-residential floor area, building owners or managers are required to use New York State Department of Labor-licensed mold assessment and remediation (or abatement) workers.

For these conditions, licensed mold assessors, remediators and abatement workers are required to file paperwork online through the NYC Department of Environmental Protection’s Mold Abatement website.

For areas to be fixed that are 10 square feet or less, follow the steps in the Mold Prevention and Removal section.

To protect against fraud, New York State law prohibits the same licensed worker from carrying out both the assessment and remediation on a property. For more information on these requirements, including a list of licensed mold assessors and remediation workers, visit the NYS Department of Labor’s Mold Program website.

For more information on controlling and removing mold hazards email NYCHNP@health.nyc.gov or call 311 and ask for the Healthy Neighborhoods Program.

Mold Prevention and Removal

The best way to prevent mold is to remove water and moisture sources.

Fix leaks. If you are a tenant, report the problem to your building manager.

Dry out wet and damp areas like bathrooms, kitchens and basements. You can monitor humidity with a humidity monitor from a hardware store.

Use an exhaust fan that vents to the outside while cooking or bathing.

Open windows to let in fresh clean air from outside.

Only open windows when outdoor air pollution is low. If you live near a high-traffic area, consider where windows are located before opening them. Go to Airnow.gov to check air quality in your area.

Make sure window guards are installed if a child younger than 11 years old lives or spends time in the home. Screens are not a substitute for window guards.

Use a dehumidifier or air conditioner to help lower indoor humidity.

Run your air conditioner on ‘recirculation’ mode on bad air quality days so it does not bring in air from outside.

To safely remove mold:

Keep children and pets away until area is cleaned.

Use water and soap (or dish detergent) to clean mold on walls or other hard surfaces.

Wear waterproof gloves while cleaning.

Dry the cleaned area completely.

Wash and dry (or throw away) sponges or rags used to clean mold.

Also see: CDC Infographic: 8 Tips to Clean Up Mold.

If the mold returns quickly or spreads after cleaning, there may be an underlying problem, such as a water leak. Report the mold problem to your landlord.

If the problem isn’t fixed in a timely way, or if the mold is in a non-residential location, submit a complaint online or call 311.

If large areas of mold are present, you may need outside help such as a professional mold abatement company. Be sure your contractor is licensed and follows NYS Labor Law requirements.

Additional Resources

How to Prevent and Get Rid of Mold in the Home (PDF)

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Keep Homes Free of Mold and Pests: What Property Owners Must Do and Tenants Should Know (Local Law 55) (PDF)

Other Languages:
Español |
한국어 |
العربية |
中文 |
简体中文 |
Kreyòl ayisyen |
Русский |
বাংলা |
Italiano |
Polski |
Français |
ײִדיש |
اردو

Mold Guidelines for Assessment and Remediation (PDF)

Other Languages: Español

EPA: Mold

EPA Moisture Control Guidance for Building Design, Construction & Maintenance

NYC Housing Preservation and Development: Indoor Allergen Hazards (Mold and Pests)

Healthy Homes: Mold (PDF)

Other Languages: Español | 繁體中文

More Information

NYC Healthy Neighborhoods Program: Home Assessments of Asthma Triggers

Indoor Moisture

Indoor Air Quality

Healthy Homes Main Page

Safe and Green Cleaning Products