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
MSDS requirements for drugs 1910.1200
Post-emergency response and medical surveillance requirements of HAZWOPER 1910.120
Minnesota administers its own occupational Safety & Health Program. 1910.120
MSDS requirements 1910.1200
Response to emergency in "normal work area" definition. 1910.120
Whether an off-site HAZMAT emergency response team may be permitted to all areas of a hazardous waste site in an emergency response action. 1910.120
Labeling requirements of hazardous chemicals. 1910.1200
Fire extinguisher requirements of Hazard Communication Standard. 1910.1200
Emergency response directive 1910.120 review. 1910.120
Hazardous substances found in veterinary practices. 1910.1200
MSDS requirements. 1910.1200
Clarification on first aid requirements for hazardous waste sites. 1910.120, 1910.120(e)(3)(ii), 1910.120(l)(2)(viii), 1910.151, 1910.151(b), 1910.1030
Training requirements for emergency and post-emergency response to marine-based oil spills. 1910.120(a)(3), 1910.120(q)(6)(iii), 1910.120(q)(6)
Meeting labeling requirements of hazard communication standard for slag wool. 1910.1200(f)
Health and safety plans for hazardous waste operations & emergency response. 1910.120
Hazardous waste operations and emergency response lapsed refresher training requirements. 1910.120
Iron oxides as used in pigment coloring operations. 1910.1200(d)(1)
Clarification on training for firefighters and HAZWOPER. 1910.120
MSDS requirements for salt 1910.1200(g)
Definition of an "article" under the hazard communication standard. 1910.1200(b)(6)(iv)