Certificate of Fitness W-42

W-42 Supervision of Handling and Use of Corrosives and Oxidizers (Citywide)


A Certificate of Fitness is required for the handling and use of corrosives and/or oxidizers in requiring a FDNY permit. Common corrosives include hydrochloric acid, sulfuric acid, nitric acid, ammonium hydroxide, caustic potash, caustic soda, etc. Common oxidizers include nitrates, hydrogen peroxide, swimming pool chemicals, nitric acid, etc. This W-42 Certificate of Fitness is a citywide Certificate of Fitness. This Certificate of Fitness is NOT authorize to supervise the storage of the corrosives and/or oxidizers.

Certificate of Fitness is valid the specific person to whom it is issued and can be used anywhere within New York City.

  • New Application Fees: $25
  • Renewal Fees: $15
  • Application Reviewed Within: 5 Days
  • Renewal Cycle: 3 Years

Before You Submit Your Application

This Certificate of Fitness can only be obtained by meeting the special qualification requirements. All applicants must review the Notice of Exam.

NYC Fire Department (FDNY)
Public Certification Unit
9 MetroTech Center, 1st Floor
Brooklyn, NY 11201
Phone: (718) 999-1988
Email: pubcert@fdny.nyc.gov or call 311

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