Certificate of Fitness for Storage and Handling of Corrosives and Oxidizers (C-42)

The C-42 Certificate of Fitness for the Supervision of Storage, Handling and Use of Corrosives and Oxidizers is required to supervise the storage, handling and use of these materials where a Certificate of Fitness is required by the New York City Fire Code.

The certificate is issued to an individual and is valid only at the specific work location listed on the certificate. Applicants must meet the requirements outlined in the Notice of Exam and Study Materials and pass the required examination.

• Applicants must meet the requirements outlined in the C-42 Notice of Exam and Study Materials and pass the required examination.

• Review the Notice of Exam and Study Materials before submitting your application.

• Gather the required supporting documents, which may include:

  • A completed Certificate of Fitness Application Form
  • A letter of employment or applicable self-employment documentation
  • Two forms of identification, at least one of which must be a government-issued photo identification, such as a driver's license or passport
  • Any additional documentation required by the Notice of Exam and Study Materials

• FDNY will review your application and supporting documentation.
• If FDNY has any questions or requires additional information, the applicant will be contacted within 3–5 business days.
• Applicants who are required to take the examination should follow the examination instructions provided by FDNY.

• The New York City Fire Code and FDNY requirements may change. Certificate of Fitness holders must review and be familiar with the latest Study Materials.
• This certificate must be renewed every three years.
• FDNY will send a Renewal Notice approximately 90 days before the expiration date. The notice includes the certificate number, expiration date, and renewal fee.
• It is the certificate holder's responsibility to renew the certificate within 364 days of the expiration date.
• Certificates that are more than one year past their expiration date cannot be renewed, and a new application will need to be submitted.
• FDNY reserves the right to require applicants to take a re-examination when submitting a renewal application.
• Certificate holders should review the applicable Notice of Exam and Study Materials for current requirements.
• To change your mailing address or work location, or to request a replacement certificate, use the FDNY Business online portal.
• Review the Certificate of Fitness Update Instructions for required documentation and processing steps.
• For work location changes, include a letter from your current employer on company letterhead confirming that you are an employee and stating your new work location. If self-employed, provide a letter requesting the change of work location and a copy of your certificate showing the previous address.

• Gather electronic copies of your supporting documents.

• Pay the $25 application fee online by one of the following methods:

  • Credit card: American Express, Discover, MasterCard, or Visa
  • Debit card: MasterCard or Visa
  • E-Check

• A convenience fee of 2% will be applied to all credit card payments. The application fee is non-refundable.

• City employees may request a fee exemption by uploading a copy of their employee ID and a letter from their City agency on official letterhead confirming that they are a current employee and that the Certificate of Fitness will be used as part of their work-related responsibilities.

• If you are an individual, you can only submit your own application.

• If you are submitting applications on behalf of a company's employees, you must be authorized by the company to act as a Designated Coordinator, and the company must be approved by FDNY. To request approval, email pubcert@fdny.nyc.gov.

• Renew your Certificate of Fitness through the FDNY Business online portal.

• Review the Certificate of Fitness Renewal Instructions before submitting your renewal.

• If you are an individual, make sure you have:

  • Your 8-digit Certificate of Fitness number
  • The last four digits of your Social Security number
  • An email address

• If you are submitting renewals on behalf of a company's employees, the company must be approved by FDNY and have a Company Code. To request approval, email pubrenew@fdny.nyc.gov.

• Pay the $15 renewal fee online by credit card, debit card, or E-Check.

• Renewals submitted more than 90 days, but no more than one year, after the expiration date will incur a $25 penalty in addition to the renewal fee.

• A 2% convenience fee applies to credit card payments. The renewal fee is non-refundable.

• If all requirements are met, the certificate will be mailed within 10 days.