NYC Mold Certification of Correction: 70-Day Challenge Window

NYC Landlord Filed a Mold Certification of Correction? Here Is Your 70-Day Window to Challenge It

Your landlord told HPD the mold is gone. They might have put paint on the spot. A handyman could have cleaned the wall. A Certification of Correction is now kept, and the time is moving.

If HPD does not come back to check within 70 days, then that problem will close by itself. Your power goes away too. The people who keep their cases open are the ones who challenge the papers fast. They use lab data that the owner cannot say is wrong.

What Happens After Your Landlord Certifies a Mold Violation as Corrected

When HPD finds mold, it gives the property owner a certain number of days to solve it. For Class B cases, where there are 10 to 29 square feet of mold, they get 30 days. For Class C cases, where there is more than 30 square feet of mold, they get 21 days.

After the work is finished, the owner files a Certification of Correction with HPD. This is a signed paper saying the problem is no longer there. You will get a letter in the mail at this time. That letter is not just for show. According to HPD's official process, a certified issue is "deemed complied" and closed 70 days after HPD gets the paperwork, unless someone checks and finds the problem again. That 70 days is your only sure chance to speak up.

The certification does not need any proof that a licensed professional did the work. For buildings with less than 10 units, the owner or super can say it is done themselves. You do not need to give any photos. You do not need to show lab results. A third party does not have to approve it.

The system is built on trust. HPD's FY21 Certification Report shows that this trust is not very strong. That year, there were 159,082 Class C violations. HPD began only 96 false certification cases.

Why Class B and C Mold Violations Still Need Your Challenge

There is one thing about mold. Local Law 55 says that for Class B and C mold violations, HPD must come back and check again before they can close the case. These cases should not close by themselves after 70 days like most other violations do. HPD's allergen hazards page also says this rule is true.

That sounds like it keeps people safe. But what happens in the real world depends on if HPD comes or not. The number of housing code problems went up by 24% in 2024. HPD gave out 895,457 reports that year. This was more than the 722,597 reports from last year, according to a Violation Watch study of HPD data.

That big number means the inspectors have a lot to do. A problem from a renter is what gets your case moving forward. If there is no help from them, your issue stays in line after many other cases.

When you question the certification, HPD writes it down and looks to set up a new inspection with you. Your challenge is what gets HPD to do the re-inspection sooner, which can make a difference for your health.

How to Challenge a Mold Certification Through HPD

When you get the certification letter, you can challenge it by calling HPD or by sending them a letter in the mail. The letter you get has steps on what to do. This is what can make your challenge work.

Call 311 or the HPD Code Enforcement line. Give the address and the number for the problem. Tell them you will contest the certification. Be clear when you give details. Say that the mold can still be seen. Say if the moisture problem was not fixed. Say if the air still smells musty. If you send your answer by mail, use certified mail. That way, you have proof of the date.

What makes a strong challenge better than a weak one is proof. A call that says "the mold is still there" leads to a fight between what you say and what the other person says. But if you call with a lab report that shows high spore numbers, it gives HPD inspectors facts they can check.

What Third-Party Lab Results Prove That an HPD Walk-Through Cannot

HPD inspectors do a quick look at the place. They try to find mold that you can see. If a landlord covered up a wall with paint and there is mold behind it, their look will not show anything. The mold is still there and keeps growing. It sends spores into your air.

A professional mold test from a trusted lab can find things you may not see. Air sampling takes in some air and counts the spores it finds on a slide. The lab then looks at how many spores are inside your home and compares that with a sample they get from outside that same day. If you have two to five times more spores inside than there are outside, it is clear that you still have a problem. Fresh paint cannot lower the number of spores.

Surface swab samples do more. They show the type of mold on a wall, pipe, or vent. That mold info is important in Housing Court. It changes the talk from "I see a stain" to "lab results confirm Stachybotrys on the bathroom ceiling at amounts that the landlord's work did not fix."

This is the kind of proof that can keep a fake certificate from going forward. You can upload it on the HPD portal, add it to a Housing Court filing, or give it to the person who comes for a re-check.

False Certification Penalties Your Landlord Faces Under Local Law 71

Filing a false Certification of Correction is not only about laws around money. Under the NYC Housing Maintenance Code, it is a crime. You may face fines up to $1,000 and can be sent to jail for up to one year if you give false statements on purpose.

Local Law 71 of 2023 made things more strict. According to HPD's October 2024 property owner bulletin, there are new penalties for reporting false mold certifications. These now start at $2,000 and can go up to $10,000. From 2025, if a building keeps sending false certifications, it will not be allowed to self-certify anymore. Instead, there will have to be an inspection before any certification counts.

These penalties only happen if someone finds the false certification. That person is you. Your challenge, supported by lab tests that say something different than what the property owner says, will start the process.

Without the challenge, the certification stays. If there is a challenge, the person who owns the property can get into real money and legal trouble.

Can I Challenge a Class A Mold Violation Certification?

Yes. Class A violations include mold that is smaller than 10 square feet. The city follows the normal rule, giving you 70 days to fix it. They do not check it again after that. This means you have less time to act compared to Class B or C problems. Try to act in the first two weeks after you get the certification letter.

Does HPD Charge Tenants a Fee to File a Certification Challenge?

No, you do not need to pay anything. The challenge is free. Call 311 or send a letter to HPD with your response. The fees in the HPD system are there only for property owners who send a request to remove their case.

What if HPD Does Not Re-Inspect Even After I File a Challenge?

Take the case to Housing Court. Tenants can file an HP Action and ask a judge to tell the owner to do repairs. You can use lab test results, photos, and medical records as proof. Recent rental ripoff hearings have shown that having records about mold problems is very helpful in court. A judge can tell the owner to fix the problem, give fines, or lower the rent.

How Quickly Can I Get Third-Party Mold Lab Results in NYC?

Most accredited labs give you air and surface sample results in 24 to 48 hours. You should book the test right after you get the certification letter. If results are more than a few weeks old, they might not say much. That's because mold conditions can change with the seasons and the amount of humidity in the air.

The Certification Letter Is Not the End of Your Case

That letter from HPD is made to end the file. The person who owns your place wants the file to be closed. HPD wants to clear its wait list and close the file, too. The person with a reason to keep the file open is you.

It's easy to ignore a claim that does not have proof. But when there are lab results, proof of spore levels, and numbers showing wet spots, it is not so simple. If you live in New York City and you got a mold letter but the problem is still in your place, you should get things checked before your time runs out.

Fast Mold Testing gives you trusted lab results in just 48 hours. This will give you the proof you need to keep your case open.