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

Filters


Date Title Standard Number
Whether the OSHA HAZWOPER standard applies to the remediation of unexploded conventional ordnance at military sites. 1910.120, 1926.65
Hazard Communications Standard. 1910.1200
The requirement for change rooms whenever employees are required to wear personal protective clothing. 1910.120, 1910.141
The coverage of the Hazard Communications Standard (HCS) to crude oil, natural gas, and natural gas condensate. 1910.1200
Standards and regulations applicable in the U.S. for sale, import, handling, and transportation of various chemicals. 1910.1200
Labeling of Latex 1910.1200
OSHA's Hazard Communication Standard. 1910.1200, 1910.1200(b), 1910.1200(b)(6)(vii), 1910.1200(b)(6)(ix), 1910.1200(d), 1910.1200(f), 1910.1200(g)
OSHA's Hazard Communication Standard, the requirements for MSDS. 1910.1200
The (PSM) for Highly Hazardous Chemicals Standard and its applicability to the specific scenarios outlined. 1910.119, 1910.1200
OSHA's Hazardous Waste Operations and Emergency Response Standard. 1910.120
Clarification of OSHA's Hazard Communication Standard with regards to the carcinogenicity of wood dust 1910.1200
MSDSs for chemicals purchased prior to 1985. 1910.1200
Clarification of the OSHA reference to welding rods in a March 21, Memorandum to Regional Administrators. 1910.1200
Letter requesting that OSHA exempt animal feed ingredients from the requirements of 29 CFR 1910.1200, the Hazard Communication Standard. 1910.1200
Interpretation of OSHA requirements for personal protective equipment to be used during marine oil spill emergency response operations 1910.120, 1910.132
Clarification on who must receive first responder awareness level training. 1910.120
The OSHA Hazardous Waste Operations and Emergency Response (HAZWOPER) regulation. 1910.120
OSHA PPE standard requirements for hazard assessment and employee training and the OSHA HAZWOPER standard requirements. 1910.120, 1910.132
The application of the OSHA HAZWOPER standard to employers of transfer facilities. 1910.38, 1910.120, 1910.120(a)(2)(iii), 1910.120(p), 1910.120(p)(8), 1910.120(p)(1)
Relationship between training requirements for those who will perform permit space rescue services in accordance with PRCS and the Hazardous Waste and Emergency Response standard. 1910.146, 1910.120