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
HHCs as it applies to how high must the percentage of a chemical be to require compliance. 1910.119
Propane as a fuel for ovens; Chlorine storage exceeding 1500 pounds. 1910.119
Interpretation of the Process Safety Management standard. 1910.119
Interpretation of the Process Safety Management standard. 1910.119
Outer Continental Shelf lands--OSHA and the U.S. Coast Guard. 1910.119
Solutions of hydrogen chloride in water. 1910.119
Solutions of hydrogen chloride in water do not apply to Process Safety Management Standard. 1910.119
When steam boilers fired by flammable liquids or natural gas are subject to the PSM standard. 1910.119
Steam boilers fired by flammable liquids or natural gas and the PSM standard. 1910.119
Employee participation requirements of the Process safety management standard. 1910.119
Flammable liquid processes and the Process Safety Management standard. 1910.119
PSM threshold quantity; EPA regulated and permitted RCRA Hazardous waste treatment. 1910.119
Storage of Pentane in excess of 10,000 pounds. 1910.119
Typical processes in a paint manufacturing facility. 1910.119
Natural gas distribution and transmission facilities. 1910.119
Natural gas facility process hazard analysis requirements. 1910.119
Process safety management standard and a "retail establishment" definition. 1910.119
PSM Standard does not apply to 10,000 pounds of hydrocarbon fuel on site used solely as a fuel for a furnace. 1910.119
Propane delivery, total aggregate quantity less than 10,000 pounds. 1910.119
Training requirements of PSM. 1910.119