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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Date Title Standard Number
Exits must not be locked or obstructed. 1910.36(d)
Hazwoper EPA and OSHA jurisdictional issues. 1910.120
Fixed ladders in outdoor advertising. 1905 - Table of Contents
Baseline to use when measuring occupational related hearing loss for OSHA recordkeeping purposes. 1904 - Table of Contents
Washington's Response to Federal Program Change (CPL 2-2.51) 1910.120
Changing tines/capacity of powered industrial trucks. 1910.178
Audiometric test results recording on the OSHA 200 log. 1904 - Table of Contents
OSHA 200 log and hearing loss. 1904 - Table of Contents
OSHA 200 Log and hearing loss. 1904 - Table of Contents
Employees who become ill or injured on the job. 1910.151
Sharp knives and utensils in the workplace 1910.132
Underground storage tanks and 1910.120. 1910.120
Modified approach to lifting several steal beams at one time. 1926.550, 1926.251
Use of automatic equipment for the machining of connecting rods, crankshafts, cylinder heads and engine blocks. 1910.147
Questions relating to occupational hearing loss. 1904 - Table of Contents
Geographic definitions, multi-functional setting; refresher training. 1910.120
Use of ladders positioned against columns 1926.1053(b)
When a lifesaving skiff is to be considered as being "immediately available" 1926.106
Use of crane or derrick suspended personnel platforms accessing a worksite. 1926.32
New manlift installations. 1910.68(b)(3)