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
Voluntary safety and health audits under the Occupational Safety and Health Act 1910.1020, 1910.95, 1910.119, 1910.120, 1910.132, 1910.134, 1910.137, 1910.146, 1910.147, 1910.272, 1910.1025, 1926.20
Process Safety Management of highly hazardous chemicals standard. 1910.106, 1910.119
Worker protection for employees incinerating hazardous waste on cement plant property. 1910.119, 1910.120, 1910.1200
Clarification of the Process Safety Management of Highly Hazardous Chemicals Standard. 1910.106, 1910.119
Process Safety Management regulations and directives. 1910.119
Process Safety Management (PSM) of Highly Hazardous Chemicals. 1910.119
Process safety management at what point a work site change would no longer be considered a modification but a new facility. 1910.119
Process Safety Management (PSM) at work sites. 1910.119
Interpretation of the process safety management of highly hazardous chemicals standard. 1910.119
Applicability of the PSM standard to storage and transfer of flammable liquids. 1910.119(a)(1)(ii)(B)
OSHA's Standard Process Safety Management of Highly Hazardous Chemicals. 1910.119
Carburization process and the applicability of Process Safety Management for Highly Hazardous Chemicals. 1910.119
Challenge Testing as a Substitute for Annual Refresher Training. 1910.119, 1910.269
Interpretation of the Process Safety Management Highly Hazardous Chemicals standard. 1910.119
The (PSM) for Highly Hazardous Chemicals Standard and its applicability to the specific scenarios outlined. 1910.119, 1910.1200
Clarification on whether the ozone process described is covered by the PSM Standard. 1910.119
Interpretation of the Process Safety Management of Highly Hazardous Chemicals Standard. 1910.119, 1910.147
Clarification of the Process Safety Management standard with regard to material and energy balances. 1910.119
Three scenarios and questions regarding on-site natural gas in pipe lines used as a fuel and as a feed stock. 1910.119
The term "interconnection" as it would apply to utilities, steam and electric, used in a covered process. 1910.119