Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

NOTICE:

How to Request a Letter of Interpretation

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Date Title Standard Number
Outer Shipping Container Labeling 1910.1200
The health and safety of employees who work in a State building housing the justice of Peace Courts and which is infested with termites. 1975.3(d)
Eight hours refresher training per year required specific to job responsibilities at a TSDF. 1910.120
Unfavorable Review Commission Decision. 1910.107(b)(5)(iv)
Training and certification procedures of Hazwoper. 1910.120, 1910.120(q), 1910.120(q)(6)(v), 1910.120(q)(7), 1910.120(q)(8)
Training requirements for employees in food storage facility where ammonia is used solely as a refrigerant. 1910.120, 1910.120(p)(1), 1910.120(p)(7), 1910.120(p)(8), 1910.120(q), 1910.120(q)(6)(iii), 1910.120(q)(6)(v)
Regulations For Cotton Waste Operations 1910.1000, 1910.1043
Labeling requirements with regard to containers of pesticides 1910.1200
Requirements for minimum illumination at construction sites. 1926.56
MSDS required with initial shipment of chemicals used in humidification systems in office areas 1910.1200
Program directive on de minimis violations.
Favorable Review Commission Decision.
Thomas E. Baca replacing Millicent Woods on the FACOSH.
Favorable Supreme Court Decision.
Favorable Decision in National Engineering & Contracting Co. and Meroe Contracting and Supply v. OSHA.
Regarding labeling requirements of the OSHA's Hazard Communication Standard. 1910.1200
The posting of notices on the application of certain Federal laws. 1903.2
Calendar stacks used in the pulp and paper industry 1910.261, 1910.212
Shielding of drive lines on pivotal sprinklers and an interpretation of the words "guarded by location". 1928.57
Implementation of a comprehensive chemical hygiene plan for lab operations 1910.1450