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
Acceptability of storing Class II combustible liquids in DOT/NRTL approved polyethylene containers. 1910.106(d)(2)(i)
Storage of flammable liquids and corrosives in the same cabinet. 1910.106, 1910.1200(g)
Double-walled tanks do not reduce the minimum separation distances for flammable and combustible liquids. 1910.106(f)(3)(i)
Clarification of requirements for daily disposal of combustible wastes. 1910.106(e)(9)(iii)
OSHA regulation of liquified paving asphalt; not covered by 1910.106. 1910.106
Bonding and grounding of plastic containers during transfer of Class I flammable liquids. 1910.106(e)(6)(ii), 1910.106(d)(2)(iii)
Use of plastic containers and drums for flammable liquids storage. 1910.106(d)
The storage of flammable liquids in plastic containers. 1910.106
Coverage of Stored Flammables Under the Process Safety Management Standard. 1910.119(a)(1)(ii)(B), 1926.64(a)(1)(ii)(B), 1910.106
Requirements for electrical wiring in supply and disposal function warehouses containing hazardous materials. 1910.38, 1910.106(d), 1910.106(e)(7), 1910.106(e)(7)(i)
Solvent Distillation Units. 1910.106
The NOWPAK Solvent Dispensing System. 1910.106
Process Safety Management of highly hazardous chemicals standard. 1910.106, 1910.119
The "gas caddy" and OSHA's Flammable and Combustible Liquids Standard. 1910.106
Clarification of the Process Safety Management of Highly Hazardous Chemicals Standard. 1910.106, 1910.119
Applicable regulations and design calculation factors which can be used for tanks and vessels. 1910.106
Shower requirements for the Lead in Construction Standard. 1910.106, 1926.62
Request of Assistance in Evaluating Variance Application Number 2290. 1910.106
Compliance with NFPA 30 revisions in lieu of 1910.106. 1910.106
Spill containment of flammable or combustible liquids when a curb or earth dike is used. 1910.12, 1910.106(d)(6)(iii), 1926.152(c)(3)