Air Toxics Notebook
Metal Fabrication - Area Source Categories -  Subpart XXXXXX

Applicability: eCFR Subpart XXXXXX []

Area Sources* of HAPs are subject to this subpart if they are primarily engaged in any of the following activities:
  1. Electrical and electronic equipment finishing operations
  2. Fabricated metal products manufacturing
  3. Fabricated plate work (boiler shops) manufacturing
  4. Fabricated structural metal manufacturing
  5. Heating equipment manufacturing, except electric
  6. Industrial machinery and equipment finishing operations
  7. Iron and steel forging
  8. Primary metal products manufacturing
  9. Valves and pipe fittings manufacturing
This subpart applies to the following operations at Area Sources* that contain or have the potential to emit metal fabrication or finishing metal HAP (MFHAP), which are materials that contain cadmium, chromium, lead, or nickel ≥ 0.1% by weight, or materials that contain manganese ≥ 1.0% by weight:
  1. Dry abrasive blasting
  2. Machining
  3. Dry grinding and dry polishing with machines
  4. Spray-applied painting
  5. Welding

Subject facilities are classified within the following NAICS or SIC codes:
(See attached file: Metal-Fab-6X-APPLICABILITY-ALL.pdf)

This subpart does not apply to:
  1. Research or laboratory facilities
  2. Equipment repair operations, facility maintenance, or quality control activities
  3. Operations performed at on-site installations owned or operated by the Armed Forces, National Aeronautics & Space Administration, or the National Nuclear Security Administration;
  4. Operations that produce military munitions by or for the Armed Forces or equipment directly and exclusively used for transporting military munitions; and
  5. Operations that do not use or emit the listed MFHAPs

*Area Sources of HAPs emit or have the potential to emit:
  • < 10 tons per year of any single HAP, or
  • < 25 tons per year of combined HAPs.
  • Major Sources emit more than Area Sources.
Rules apply to small, area sources? Yes
Known Sources in NDEQ Jurisdiction:
(See attached file: 6X - Initial Notifications Received - 08-10-2011.pdf)

SizeFile Name
7 KB 6X - Initial Notifications Received - 08-10-2011.pdf
Date of Original Final Rule: 7/23/08
Amendments Dates:
State Regulations (Title 129): Title 129, Chapter 28, Section 001.112. Sources are also responsible for ensuring they are in compliance with current federal requirements found for this subpart in the CFR.
Federal Regulations: 40 CFR 63.11514
Related Rules:

NESHAP - 40 CFR Part 63

Subpart HHHHHH - Surface Coating and Paint Stripping (auto body, metal and plastic parts)
Subpart MMMM - Misc. Metal Parts Surface Coating
Regulations and Federal Registers:
eCFR Subpart XXXXXX []

(See attached file: 6X - Fed. Reg. 2008-07-23 - Final Rule.pdf)

(See attached file: 6X - Fed. Reg. 2008-04-03 - Proposed Rule.pdf)

SizeFile Name
251 KB 6X - Fed. Reg. 2008-07-23 - Final Rule.pdf
322 KB 6X - Fed. Reg. 2008-04-03 - Proposed Rule.pdf
Important Dates: Source Classification
  1. Existing Source
    • Commenced construction or reconstruction before April 3, 2008
  2. New Source
    • Commenced construction or reconstruction on or after April 3, 2008
Initial Notification
  1. Existing Source
    • Must notify by July 25, 2011
  2. New Source
    • Must notify by November 20, 2008 or within 120 days of startup, whichever is later.
Compliance Dates
  1. Existing Source
    • Must comply by July 25, 2011
  2. New Source
    • Must comply by July 23, 2008 or upon startup, whichever is later.
Compliance Status Notification
  1. Existing Source
    • Must notify by November 22, 2011
  2. New Source
    • Must notify by November 20, 2008 or 120 days after startup, whichever is later.
Annual Certification of Compliance Report
  1. First report must cover the period beginning on the compliance date through December 31
  2. Subsequent reports must cover January 1 - December 31
  3. Reports must be submitted by January 31
  4. If sources have an operating permit, they may send their annual report along with their certification of compliance report (due March 31)

FAQs, Fact Sheets, and Rule Summaries:
(See attached file: 6X - EPA Q and A 12-2011.pdf)

(See attached file: 6X-APPLICABILITY-ALL.pdf)

(See attached file: 6X - EPA brochure.pdf)

(See attached file: 6X - EPA_flowcharts.pdf)

(See attached file: 6X - EPA method22qa.pdf)

SizeFile Name
353 KB 6X - EPA Q and A 12-2011.pdf
147 KB 6X - EPA brochure.pdf
115 KB 6X - EPA_flowcharts.pdf
43 KB 6X - EPA method22qa.pdf
Presentations, Training and Articles:

(See attached file: 6X - EPA Presentation.pdf)

SizeFile Name
112 KB 6X - EPA Presentation.pdf
Other Information and Resources:
Iowa DNR Area Source NESHAP website [] - fact sheets, guidance documents, and presentations

EPA's Area Source Rule Website [] contains the federal register notices and guidance documents for many of the area source rules

Page Last Updated: 6/11/18