HPD Mold Violation in NYC: What Building Owners Need to Do

Joshua Neuman
Founder, 123inspections.com
August 2026
An HPD mold violation in NYC requires a specific response sequence — ignoring it or remediating without a licensed assessor creates additional violations. Here's the exact compliance sequence required by NYC law.

Understanding HPD Mold Violations


HPD (NYC Housing Preservation and Development) issues mold violations to building owners when mold conditions are found in rental units during inspection. Violations are classified by severity:


Class A (Maintenance): Minor mold conditions. Owner has 90 days to correct.

Class B (Hazardous): Moderate mold conditions presenting a hazard. Typically 30 days to correct.

Class C (Immediately Hazardous): Serious mold conditions presenting an immediate health hazard. 24 hours to correct (or begin emergency correction).


Mold violations under NYC Local Law 55 framework are typically Class B or Class C depending on extent and condition of affected occupants.


The Required Compliance Sequence


This is the legally required sequence for mold violation response. Skipping or reordering steps creates additional violations.


Step 1: Identify and Stop the Moisture Source


Before any mold work begins, find and stop the source of moisture. Common sources in NYC residential buildings:

  • Roof leaks (especially in pre-war buildings with flat or low-slope roofs)
  • Plumbing leaks (pipe joints, drain lines, supply leaks inside walls)
  • HVAC condensation (improperly drained condensate lines)
  • Exterior facade water infiltration (failed caulk at windows, deteriorated brick mortar, cracked parapet)
  • Between-floor leaks (from unit above)
  • Basement moisture through foundation

    • Mold remediation without correcting the moisture source will fail. Mold will return. HPD will issue additional violations. Do not call a remediator before finding the source.


    Step 2: Hire a Licensed Mold Assessor for Pre-Remediation Assessment


    Under NYC Local Law 55 (§27-2056.11), any mold remediation covering more than 10 square feet requires a pre-remediation assessment by a NYS DOL Licensed Mold Assessor. This is not optional.


    The assessment:

  • Documents the type, location, and extent of mold growth
  • Identifies the moisture conditions (should confirm Step 1 finding)
  • Provides a written report that defines the scope of remediation needed
  • The written assessment must be provided to the remediator before work begins

    • The assessor and the remediator must be different companies. A remediator who offers to "assess first" is violating Article 32 if they are also selling you the remediation. Get an independent assessment first.


    Step 3: Hire a Licensed Mold Remediator


    Provide the licensed assessor's written report to a NYS DOL Licensed Mold Remediator. The remediator must:

  • Follow the scope defined in the assessment report
  • Use appropriate containment and personal protective equipment
  • Dispose of mold-affected materials properly
  • Provide documentation of work completed

    • Step 4: Post-Remediation Clearance Inspection


    After remediation is complete, a licensed mold assessor (can be the same assessor or a different one) must conduct a post-remediation inspection to verify:

  • Visible mold has been removed
  • Air sampling shows levels consistent with Condition 1 (normal) findings
  • The remediation area has been properly cleaned and restored

    • The clearance inspection produces a clearance report. This document is your proof that remediation was successful.


    Step 5: File Compliance Documentation with HPD


    After clearance inspection, notify HPD of violation correction. HPD may conduct a follow-up inspection to confirm conditions are resolved. Maintain the following documents:

  • Pre-remediation assessment report (licensed assessor, license number visible)
  • Remediation contractor work documentation
  • Post-remediation clearance report (licensed assessor)

    • Timelines


    Class B violation (30 days): Complete all steps above in 30 days from violation date. This is tight — book assessment and remediation immediately upon receiving the violation.


    Class C violation (24 hours): Emergency response within 24 hours. Typically this means: immediately remediate visible hazard surface, then follow up with licensed assessment and formal remediation.


    Consequences of Non-Compliance


  • Civil penalties: Up to $250–$1,000/day for uncorrected hazardous violations
  • Judgment liens on the property
  • Emergency repair orders (HPD repairs at owner's expense, plus administrative costs)
  • Rent reduction orders for stabilized tenants in affected units
  • In severe cases: buildings may be placed in HPD's Alternative Enforcement Program (AEP), which involves intensive oversight and fee obligations

    • Compliance documentation (assessor report, clearance certificate) is your protection. Without it, HPD has no record that remediation was properly completed.

    Regulations Referenced

    Quick Answers

    What do I do when I receive an HPD mold violation?
    First, identify and stop the moisture source. Then hire a NYS DOL Licensed Mold Assessor for a pre-remediation assessment (required by NYC Local Law 55 for any mold area exceeding 10 sq ft). Hire a separate licensed remediator for the actual work. After remediation, get a post-remediation clearance inspection and file compliance documentation with HPD.
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