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Indiana Department of Environmental Management

Compliance and Technical Assistance Program

CTAP > Plating > Chromium Electroplating Operations Chromium Electroplating Operations

Amendments to 40 CFR 63, Subpart N

As of September 21, 2015 additions of Perfluorooctane Sulfonic Acid and Perfluorooctane Sulfonate (PFOS) to any chromium electroplating and/or anodizing tank are prohibited. The U.S. Environmental Protection Agency (U.S. EPA) may grant a one year extension from this date to assist with compliance.

On April 7, 2016, the California Air Resources Board (ARB) approved three Non-Perfluorooctane Sulfonic acid (PFOS) based chemical fume suppressants for use in specific chrome plate operations (two products for decorative operations and chromic acid anodizing, and one product for hard chrome plating). These products, as well as their corresponding surface tension requirements, have been added to the list of already approved fume suppressants [PDF].

California’s requirements are more stringent than the federal rule (NESHAP, Subpart N), so these approved suppressants can be successfully used in Indiana and other states seeking to comply with Subpart N. Additionally, the attached list includes company and product information for Non-PFOS based wetting agents/fume suppressants/surfactants [PDF].

For further information as to non-PFOS alternatives, please contact Compliance Technical Assistance Program (CTAP) staff (800-988-7901, A CTAP consultation request can be made as well.

Emission Limit Reductions

By September 19, 2014, existing operations must meet the following limits:

  • Regarding open & enclosed hard chromium electroplating tanks:
    • large – reduced from 0.015 to 0.011 mg/dscm
    • small – reduced from 0.030 to 0.015 mg/dscm
  • Regarding decorative electroplating/chromium anodizing:
    • reduced from 0.010 to 0.007 mg/dscm

Immediately upon startup, new operations must meet the following limits:

  • Hard chromium electroplating:
    • 0.006 mg/dscm
  • Decorative Electroplating/Chromium Anodizing:
    • reduced from 0.010 to 0.006 mg/dscm

Testing Requirements for Chromium Emissions

If a facility completed its performance test for chromium emissions after January 25, 1995 and those results meet the lower limits, that facility is not required to re-test. However, if the test occurred prior to January 25, 1995, the facility is required to re-test.

Best Management Practices Requirements

BMPs must be added to your O&M Plan and put into practice no later than March 19, 2013.

For specific information concerning the amendments, please review Changes to 40 CFR 63, Subpart N [PDF].

For basic information on how to comply with the regulation, please review A Guidebook on How to Comply with the Chromium Electroplating and Anodizing National Emission Standards for Hazardous Air Pollutants [PDF], revised September 2004.


U.S. EPA Resources

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