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Compliance and Technical Assistance Program

CTAP > Plating > Chromium Electroplating Operations Chromium Electroplating Operations

Amendments to 40 CFR 63, Subpart N

The U.S. EPA finalized amendments to 40 CFR 63, Subpart N, Chromium Emissions from Hard and Decorative Chromium Electroplating and Chromium Anodizing Tanks on September 19, 2012. The amendments include emission limit reductions, potential changes to testing requirements of chromium emissions, an incorporation of Best Management Practices (BMP) within the Operation and Maintenance Plan (OMP), as well as prohibiting of the use of Perfluorooctane Sulfonic Acid (PFOS).

Reminder: a Notification of Compliance Status report certifying compliance or non-compliance with 40 CFR 63, Subpart N is required to be submitted to IDEM by October 19, 2014. The report should be submitted to:

Indiana Department of Environmental Management
Office of Air Quality Compliance and Enforcement Branch MC 61-50
100 North Senate Avenue IGCN 1003
Indianapolis, IN 46204-2251

A signed scanned copy of this report can also be sent by e-mail to David Rice, Office of Air Quality (DRice at

In addition to the October deadline, after 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. EPA may grant a one (1) year extension form this date to assist with compliance.

Additionally, the Compliance Technical Assistance Program (CTAP) may be contacted at (800) 988-7901 for confidential assistance. 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.


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