Mold in an NYC Apartment: Landlord Responsibility and 311 Steps

TL;DR: If you see a leak or signs of mold, notify the landlord and keep a written record. Ask what water or moisture source was identified and how it will be fixed—not only whether the wall will be cleaned or painted. If the hazard is not fixed, or the work is not being done safely, NYC HPD says to file a complaint online or call 311.

NYC's mold rules are not one universal deadline or one procedure for every building. Local Law 55 applies to owners of buildings with three or more apartments. NYC Health also identifies coverage for a building of any size when a tenant has been diagnosed with moderate or severe persistent asthma. A separate contractor rule applies when the mold area is more than 10 square feet and the property has either 10 or more residential units or 25,000 or more square feet of non-residential floor area.

The practical rule is simpler: source before surface. NYC Health says the best way to prevent mold is to remove water and moisture sources. A fresh coat of paint may finish a repair, but it does not answer whether the leak, condensation, or other moisture source was found and corrected.

First, describe what you observe

Discoloration, bubbling paint, a musty odor, damp drywall, or a returning stain deserves attention. Report the location and condition rather than trying to label the material yourself.

Focus your report on what you can observe:

the exact room and surface;
when you first noticed it;
whether the area is wet, growing, or returning;
any active or recent leak;
damaged paint, plaster, drywall, flooring, or caulk; and
what prior cleaning, patching, or painting was done.

If you have symptoms or a medical concern, speak with a health-care provider. A building complaint record cannot diagnose an illness or establish its cause.

Ask the source-before-surface question

When management proposes cleaning, patching, or painting, ask:

“What water or moisture source was identified, what work will correct that source, and what affected material will be cleaned, removed, dried, or replaced before the surface is closed and painted?”

That question does not assume every paint job is improper. Paint can be the final step after a sound repair. The point is to make the hidden step explicit.

Useful follow-ups include:

Was the source a plumbing leak, roof or facade leak, condensation, ventilation problem, or something else?
Is the source active, and when will it be corrected?
How will the area be dried before it is closed?
What material is being removed or retained?
Does the building-and-area threshold require licensed mold professionals?
Who will confirm that the source work and surface work were completed?

Keep the answer in writing. Photograph the condition before and after work without disturbing the surface.

Know which NYC scope applies

Buildings with three or more apartments

HPD says Local Law 55 of 2018 requires owners of buildings with three or more apartments to keep tenants' apartments free of mold and pests. The duty includes safely fixing the conditions that cause the problem.

This is why a surface-only description may be incomplete. The official guidance expressly includes the underlying condition.

A diagnosed asthma exception for smaller buildings

NYC Health says the mold requirement also applies to a building of any size when a tenant has been diagnosed with moderate or severe persistent asthma. If this describes your household, ask the health-care provider and the City about the current documentation and inspection process rather than assuming a photo or self-reported symptom establishes coverage.

The property-size and 10-square-foot contractor threshold

NYC Health says an owner must hire a New York State Department of Labor-licensed mold assessor and mold remediator when there is more than 10 square feet of mold and the property has either 10 or more apartment units or 25,000 or more square feet of non-residential floor area. The assessor and remediator must be independent of each other.

Both the affected area and one of the property-size thresholds matter. Do not shorten the rule to “anything over 10 square feet needs licensed contractors” or “every 10-unit building always needs licensed contractors.”

This is an owner requirement. It is not an instruction for a tenant to hire, supervise, or pay the contractors.

Report the condition in a usable way

Send a short written notice to the owner or management company. Include facts rather than a diagnosis you cannot support.

Subject: Water/moisture and possible mold condition at [address, apartment]

On [date], I observed [dampness/discoloration/returning spots/bubbling paint/leak] at [exact location]. The area [is wet/is growing/returned after prior work]. Please confirm the water or moisture source, the work planned to correct it, and how the affected material will be handled before patching or painting. I am attaching dated photos. Please reply with the access and repair plan.

Save the message, photos, replies, work orders, and dates when workers entered. If a condition changes, add a new dated photo rather than replacing the old one.

For a broader documentation and escalation sequence, use the NYC apartment repair paper-trail guide.

When to use 311

HPD's current tenant guidance says to notify the landlord if you observe a leak, signs of mold growth, or pests. If the landlord does not fix the hazard, or if repair work is not being done safely, file a complaint online or call 311.

When making the complaint:

give the exact address and apartment number;
describe the observable leak, dampness, damage, or suspected mold area;
state whether you notified the owner and what happened;
describe any unsafe work you observed; and
keep the Service Request number and submission date.

Do not promise yourself an inspection date or outcome. A 311 complaint creates an official service request; HPD determines the response under its current procedures.

You can also search HPD Online for complaints and violations at the property. A complaint means a condition was reported. Read it separately from a violation or a corrected status.

What not to assume about deadlines or remedies

There is no safe basis for telling every NYC renter that every mold condition must be fixed within one universal 30-day period. Violation classifications, correction dates, building scope, inspection findings, and other facts can change the applicable process.

Do not stop paying rent, hire a remediator and deduct the bill, break a lease, or assume relocation or damages based only on this guide. Those steps can have serious legal and financial consequences. If the condition remains unresolved, use current HPD and 311 channels and get case-specific advice from a qualified tenant attorney or housing organization.

A practical repair-review checklist

Before treating the job as complete, ask whether the record shows:

[ ] the reported leak, dampness, or suspected mold location;
[ ] the identified water or moisture source;
[ ] the source repair, not only surface work;
[ ] drying and handling of affected material;
[ ] the building's residential unit count;
[ ] an estimate of the affected area when the 10-square-foot threshold may matter;
[ ] licensed, independent assessor and remediator details when both thresholds apply;
[ ] dated before-and-after photos;
[ ] the work order or written completion description; and
[ ] a 311 Service Request number if the hazard was not fixed or work was unsafe.

The goal is not to become a mold professional. It is to preserve a clear record and ask whether the repair addressed the cause.

Mold questions NYC renters ask

Does an NYC landlord have to fix mold?

HPD says Local Law 55 requires owners of buildings with three or more apartments to keep apartments free of mold and safely fix the conditions causing it. NYC Health also identifies coverage in a building of any size when a tenant has diagnosed moderate or severe persistent asthma. Other building categories may involve different rules, so keep the scope attached.

Is painting over mold illegal?

A photo of fresh paint cannot establish what work happened underneath or whether a law was violated. Ask what moisture source was identified, what source repair occurred, and how affected material was handled before the surface was closed.

How long does a landlord have to fix mold in NYC?

Do not rely on a universal “30 days” answer. The applicable timing can depend on the building, condition, inspection, violation classification, and current agency process. Notify the owner promptly, preserve the record, and use 311 if the hazard is not fixed or work is unsafe.

Does 311 provide a free mold inspection?

HPD tells tenants to file a complaint online or call 311 when the owner does not fix the hazard or work is unsafe. That creates a City service request; it is not a promise of a particular inspection time, test, remediation service, or result. NYC Health separately says a doctor can request a free home environmental inspection for a tenant or child with asthma through the Health Department's registry.

Do all mold jobs require licensed contractors?

No. The specific HPD rule cited here applies when a residential property has 10 or more units and there is more than 10 square feet of mold. In that situation, the owner must use independent New York State Department of Labor-licensed mold assessment and remediation contractors.

Can I withhold rent because of mold?

Do not make that decision from an online checklist. Withholding rent can trigger a nonpayment case and depends on facts and legal defenses. Use the owner, 311, HPD, and qualified legal-advice channels for your situation.

Search broadly, then verify the apartment

Set up RentReboot alerts to discover apartments that match your preferences. Before you commit to a unit, check the address, tour carefully, document promised repairs, and use official records for conditions that listing photos cannot resolve.

General information, not legal or medical advice. Official guidance and your building's facts can change; recheck current NYC Health, HPD, and 311 instructions before acting.

Primary sources

Retrieved August 11, 2026.