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
Formaldehyde (37% by weight or greater) in the Process Safety Management Standard 1910.119
Hearing Conservation Amendment to the OSHA 200 log. 1904 - Table of Contents
Recording Hepatitis B and HIV occupational exposures. 1904 - Table of Contents
Applicability of bloodborne pathogens to non-incorporated business owners and discarded feminine hygiene products. 1910.1030
Maintaining Medical Records for Employees Subject to Medical Surveillance 1910.120
Clarification of "laboratory" and "process" relative to process safety management standard. 1910.119
Energy control devices lockable design requiremnets. 1910.147
Clarifications of Interpretations and Citation Policy 1910.38, 1910.157
Electrical standards and computer security devices. 1910 Subpart S
HHCs as it applies to storing of flammable liquids. 1910.119
Muriatic acid not subject to Process Safety Management standard. 1910.119
Regulations for scaffold casters. 1910.29, 1926.452(w)
Policy for warning tags on scaffolds. 1926.200
PSM standard and fertilizer storage and mixing facilities. 1910.119
Process Safety Management standard. 1910.119
Display of a nonionizing radiation warning sign meets standard 1910.97
Acceptable job-made extension cords. 1910.303(b)(1)(i), 1910.303(e), 1910.304(a)(2), 1910.305(a)(2), 1910.305(g)(2)(iii), 1926.403(b)(1)(i), 1926.404(a)(2), 1926.405(g)(2), 1926.405(g)(2)(iv), 1926.405(g)(2)(v), 1910 Subpart S, 1926 Subpart K
Application of Process Safety Management of Highly Hazardous Chemicals to the manufacture of explosives and pyrotechnics. 1910.119(a), 1975.1
Soil testing for excavations and confined spaces. 1926.21, 1910.146, 1926.651(g)
Quality of hearing conservation programs & the Standard Threshold Shifts (STS) recording requirement. 1904 - Table of Contents