OSHA Letters of Interpretation

OSHA standards can’t spell out every situation. When an employer, worker or union asks how a rule applies to a specific case, OSHA may answer in a letter of interpretation. These letters are public and searchable, and they’re one of the best ways to settle “does this rule apply to us?” questions.

• Employers
• Workers

What they are

• Written answers from OSHA to specific questions about its standards and policies.
• Published on OSHA’s website, searchable by standard number and keyword.
• Examples of topics: whether a task counts as construction or maintenance, when fall protection is required on a specific structure, whether an injury is recordable, and how often equipment must be inspected.

What they are not

• Not new rules. They explain existing requirements; they can’t create new ones.
• Tied to the facts in the letter. If your situation is different, the answer may be different.
• Not always current. Standards change, and later letters or rules can supersede old ones. OSHA notes some letters as superseded or archived.
• Not binding on state plans. State plan states may interpret their own rules differently.

How to use them

1. Find the standard that applies. See How to Read an OSHA Standard.
2. Search OSHA’s interpretations page by the standard number (for example, 1926.501) or keywords.
3. Read the facts carefully and compare them to your situation.
4. Check the date, and look for newer letters on the same question.
5. Keep a copy with your safety records if you rely on it.

Other OSHA guidance

• The preamble to a standard explains OSHA’s reasoning when the rule was issued.
• Directives and compliance instructions tell inspectors how to enforce a standard.
• FAQs are published for many standards, such as silica and recordkeeping.

Asking your own question

Anyone can write to OSHA’s Directorate of Enforcement Programs with a question about how a standard applies. Describe the situation clearly and cite the standard. Answers can take months, so for urgent questions call your OSHA area office or your state plan, or use free on-site consultation. See Free OSHA Consultation.

Last updated: October 2, 2026