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.

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How to Request a Letter of Interpretation

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Date Title Standard Number
Responsibilities for hospitals to comply with HAZWOPER standard. 1910.120
Revision of STD 1-11.5 as a result of DOT changes.
Testing of type C soil is not necessary if employees are adequately protected. 1926.650, 1926.652
Error corrected in response of Sept. 4, 1990 concerning fire hazard associated with TCE 1910.120
Interpretation of 1910.147, related to floating fish processors. 1910.147
Training required for emergency response at industrial facilities 1910.120, 1910.134
Securing a personal fall arrest lanyard to a portable hook ladder as a safety measure 1910 - Table of Contents
Recording Of Hearing Loss and Cumulative Trauma Disorders 1910.95
Grain elevator inspection activities 1910.272
OSHA's Hazard Communication Standard as it applies to the janitorial service industry. 1910.1200
Development of increasing safety use of cranes
Emergency response by fire company and utility workers, and required training. 1910.120
Whether or not OSHA Standard 1910.147, lockout/tagout would apply to motor vehicles. 1910.147
Use of link chains as lanyards and contractor's responsibility to supply safety nets for worker protection 1926.104
Outer Shipping Container Labeling 1910.1200
Eight hours refresher training per year required specific to job responsibilities at a TSDF. 1910.120
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)
Training and certification procedures of Hazwoper. 1910.120, 1910.120(q), 1910.120(q)(6)(v), 1910.120(q)(7), 1910.120(q)(8)
Unfavorable Review Commission Decision. 1910.107(b)(5)(iv)
Regulations For Cotton Waste Operations 1910.1000, 1910.1043