OSHA interpretive letters: Practical compliance guidance at your fingertips
Is an underground utility system a permit-required confined space? Can forklift operators be evaluated virtually? How does an employee’s cochlear implant affect audiometric testing? If you’ve ever struggled to understand how an OSHA standard applies to YOUR workplace, you’re not alone!
Fortunately, the agency regularly posts answers to questions posed by employers, employees, and other stakeholders. Those answers come in the form of letters of interpretation (LOIs).
How LOIs can help you
LOIs provide supplementary guidance explaining how a standard, regulation, and/or statute applies to a particular workplace situation or hazardous condition. OSHA may also use LOIs to further explain its compliance directives. Perhaps more importantly, because OSHA’s regulations often lag years or even decades behind advances in technology, equipment, machinery, and work practices, LOIs can help bridge those gaps.
OSHA makes clear that its requirements are set by standards, regulations, and statutes. Therefore, you need to know that interpretative letters don’t change the meaning of those requirements. Put another way — LOIs do not create further obligations for you. Always review the standards, regulations, and statutes for definitive compliance mandates.
At the same time, you may wish to revisit the interpretive letters. They are not set in amber. As standards, regulations, and statutes change, OSHA may update or archive existing LOIs in response to new or revised obligations. Text may be struck out, or there may be an “ARCHIVE” notice stamped at the top of the letter. Archive notices alert you that information no longer reflects current policy but may be useful for historical or research purposes.
Recent LOIs
This year’s LOIs include the ones listed in the table. We anticipate more letters to come in the future. Be sure to look not just at the current year of LOIs but at previous years’ letters too to see what’s new. That’s because OSHA often posts LOIs long after they were sent to the stakeholder(s).
| LOI date | 29 CFR | Letter title and brief summary |
| 1/3/2025 | 1910.146 | Permit required confined space This LOI addresses questions about the permit required confined space standard as it relates to a steam, chilled, and hot water utility system connecting multiple buildings that contain in-ground utility vaults and piping, valves, and connections. OSHA states that employers must determine whether a confined space meets the definition of a permit required confined space under 1910.146(b), including whether the area contains a “recognized serious safety or health hazard.” If the definition is met, and entry is authorized, employers must isolate the permit space prior to entry. |
| 2/5/2025 | 1904 1910.502 | Enforcement stay of the COVID-19 recordkeeping and reporting requirements under 29 CFR 1910.502 OSHA will not enforce COVID-19 recordkeeping and reporting requirements under 1910.502 and will not cite employers for violations of the requirement to establish, maintain, and provide copies of a COVID-19 log under paragraphs (q)(2)(ii) and (q)(3)(ii)-(iv) or to report COVID-19 fatalities and hospitalizations under paragraph (r). OSHA will continue to enforce applicable recordkeeping and reporting requirements under 29 CFR 1904. |
| 4/1/2025 | 1910.178 | Requirements of powered industrial truck training program implementation OSHA clarifies that trainees may only operate a powered industrial truck under the direct supervision of a person with the knowledge, training, and experience to train operators and evaluate their competence. Virtual evaluation, such as live streaming via a cellphone or tablet, is not acceptable. |
| 4/29/2025 | 1904 1904.29 1904.32 1904.35 1904.40 1904.41 | Software used to generate Equivalent OSHA Forms 300 and 300A If forms generated by a company’s software meet the requirements for equivalent forms at 1904.29 and 1904.32, then these forms could be used by employers to satisfy OSHA recordkeeping requirements for maintaining OSHA Form 300 and Form 300A. The LOI also provides further detailed guidance on recordkeeping requirements. |
| 5/8/2025 | 1910.1028 1910.1051 | Engineering controls under the Benzene and 1,3-Butadiene standards OSHA explains that 1910.1028 and 1910.1051 are performance-oriented standards and as such allow for various types of engineering and work practices for benzene and 1,3-butadiene. Specifically, under these standards the following types of valves are considered forms of engineering controls: bellow and non-bellow, leak-proof and non-leak proof, and double-seal and non-double seal. |
| 6/11/2025 | 1910.95 | Audiometric testing of a worker who may have a cochlear implant Employees with cochlear implants (CI) should leave their device turned on during the audiometric test instructions and then turn the device off after the instructions have been given. For purposes of 1910.95, OSHA would not consider an audiogram to be valid if the CI is left on during the test. A qualified occupational hearing professional should be consulted to recommend appropriate hearing protection such as may be specifically designed for people with a CI or to assess whether the employee’s inability to wear hearing protection with the CI processor would cause additional hearing loss. |
| 6/17/2025 | 1910.25 | Stair angle and tread depth requirements This LOI explains how stair tread depth must be measured in order to provide adequate stepping space and to protect employees from falling. OSHA says its intention for the 9.5-inch minimum tread depth requirement in 1910.25 is consistent with national consensus standards for standard stairs (ANSI A1264.1 and NFPA 101). |
| 7/28/2025 | 1904 1904.7 | Red light therapy wraps OSHA states that LED (light emitting diode) red light therapy and red light therapy wrap technology don’t constitute first aid for purposes of OSHA’s recordkeeping requirements. The agency has no plans to initiate rulemaking to add LED red light therapy to the first aid list in 1904.7. |
| 7/30/2025 | 1910.95 1910.95(b)(1) 1910.95(d)(2)(i) 1926.52 1926.52(e) | 140 decibels (dB) impact/impulse policy under the noise standard This LOI discusses OSHA’s enforcement of the 140 dB peak sound pressure level in 1910.95 and 1926.52. |
| 8/1/2025 | 1910.134 1910.134(c) 1910.134(e) 1910.134(e)(5) 1910.134(e)(5)(i) 1910.134(e)(5)(iii) 1910.134(e)(6) 1910.134(e)(6)(i)(A) | Whether the respiratory protection medical evaluation may consider factors beyond respirator use This LOI addresses the following questions: 1. To what extent does OSHA's Respiratory Protection standard require that the physician or other licensed health care professional's medical evaluation for respirator use include consideration of factors beyond respiratory protection that affect fitness to safely perform the expected job tasks while wearing a respirator? 2. Is there a reasonable expectation that the employer will provide functional job descriptions to include more than the narrowly specified information required by 1910.134(e)(5)(i)? |
| 8/25/2025 | 1910.332(b) 1910.333 1910.333(a)(1) 1910.333(a)(2) 1910.333(c) 1910.333(c)(2) | Electrical busway hot swappable plug-in units The insertion or removal of a hot swappable plug-in unit for an electrical track busway is covered under 1910.333. Under 1910.333(a)(1), live parts to which an employee may be exposed must be deenergized before the employee works on or near them, unless the employer can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations. If the exposed live parts are not deenergized, other safety-related work practices must be used, in accordance with paragraph (a)(2), to protect employees who may be exposed to electrical hazards. |
| 9/29/2025 | 1926.62 1926.62(h)(1) 1926.62(i)(2)(i) 1926.62(i)(4)(ii) 1910.1025 1910.1025(h)(1) 1910.1025(i)(2)(i) 1910.1025(i)(4) | Clarification of “as free as practicable” lead contamination on surfaces OSHA explains that employers must have a regular, rigorous housekeeping schedule to meet the intent of the general industry and construction standards and to protect employees. |



















































