A mold violation in NYC: the citywide numbers.
mold violations HPD has written across the city
See what is open on one building.
A mold violation in NYC is one of 131,470 HPD has written across the city. 12,097 of them are Class C, the immediately hazardous class, 9.2% of the category. Of those Class C violations 2,171 have ever been certified corrected, 17.9%, and 3,973 have stood open more than a year with nothing filed.
What this means
A mold violation means the owner has to correct the condition under the housing maintenance code, and larger mold jobs fall under Local Law 55 as well. HPD tracks each cited condition until the owner certifies the correction.
If you own or manage the building. A mold violation stays open until HPD accepts a certification or closes it, and it comes up at sale, refinance and permit. 2,774 mold violations citywide are already marked Not Complied With.
If you clear violations for a living. 3,973 Class C mold violations are more than a year old with no certification on file, 32.8% of the class. That is the standing work, citywide.
If you rent here. Each of these was confirmed by an HPD inspector. A certification is the owner’s word that the repair was made; it does not show whether the condition is gone.
Mold by borough
The Bronx carries the most mold violations of the five boroughs, 53,918, and Staten Island the fewest at 3,037. Volume is not the same as follow-through: the Bronx certifies 20.6% of its Class C mold violations and Queens 13.1%.
| Borough | Violations | Class C | Class C certified | Median days |
|---|---|---|---|---|
| Bronx | 53,918 | 5,442 | 20.6% | 34 |
| Brooklyn | 40,428 | 3,365 | 16.9% | 33 |
| Manhattan | 19,708 | 1,810 | 15.4% | 33 |
| Queens | 14,379 | 1,117 | 13.1% | 34 |
| Staten Island | 3,037 | 363 | 15.2% | 32 |
Each borough links to its own page for this category, with its month-by-month counts, its streets and every status. Median days is that borough’s median from inspection to a filed Class C certification.
Where mold violations stop
Every mold violation carries a status, and together they show how far the category gets. Violation Closed is the most common; Not Complied With sits on 2.1% of the category, meaning the certify-by date passed unanswered.
| Current status | Violations | Share |
|---|---|---|
| Violation Closed | 59,855 | 45.5% |
| Violation Dismissed | 23,349 | 17.8% |
| First No Access To Re- Inspect Violation | 16,652 | 12.7% |
| Notice Of Issuance Sent To Tenant | 12,243 | 9.3% |
| Defect Letter Issued | 10,908 | 8.3% |
| Not Complied With | 2,774 | 2.1% |
| Violation Will Be Reinspected | 1,606 | 1.2% |
| NOV Sent Out | 1,567 | 1.2% |
The eight most common statuses on mold violations citywide, out of 131,470. Each name links to its own page in the status glossary.
How mold violations compare with the other five categories
This site tracks six categories of HPD housing violation. On the share of Class C violations ever certified corrected, mold violations sit at 17.9%, and the citywide median time to a filed certification is 33 days. Heat and hot water, Lead paint, Vermin and pests, Water leaks, Electrical each have the same tables for their own violations, and the certificate of correction guide compares certification across all six.
Common questions about NYC mold violations
How many mold violations does NYC have?
HPD has written 131,470 mold violations under the housing maintenance code through September 27, 2026, and 12,097 of them are Class C, the immediately hazardous class. That is a count of the city's own published violations in our copy of the data, not an estimate.
Is a mold violation serious?
It depends on the class HPD's inspector assigned. 9.2% of mold violations are Class C, which carries a 24-hour correction window; the rest are Class A or B, at 90 and 30 days. What each class means has its own page.
How long does a mold violation take to clear?
For Class C, the citywide median from inspection to a filed certification is 33 days. 17.9% of Class C mold violations have ever been certified corrected, and 3,973 have stood open more than a year with nothing filed.
Does this page report a mold condition or clear a violation?
No. It counts violations. A condition inside an apartment is reported to 311, and a correction is certified with HPD directly. This site files nothing and represents no one, and nothing here is advice.
What these numbers do not tell you
They do not say whether a condition is gone. A violation with no certification may have been fixed the same week with nothing filed, or never touched, and HPD’s data cannot tell the two apart. They carry no penalty amounts. They say nothing about what an owner intends or what happens next. This page names no building and no owner; to look up one building, use the form above.
Cite this page
ViolationScout, Mold violations in New York City, counts by class, borough and status over HPD's Housing Maintenance Code Violations dataset, filtered to mold. Figures through September 27, 2026, read on September 29, 2026. https://violationscout.com/nyc/mold
Counts of violations whose description matches mold; certified means the violation carries a certified date; median days is the median of certified date minus inspection date over the Class C violations that carry both. Source: NYC Open Data. How every figure here is counted: /methodology.
Every figure here is a citywide count; no building or owner is named on this page. By borough, status codes decoded, the guides, citywide.