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Your OSHA 300 Log Picks You for the Noise Inspection: What a Hearing Conservation Program Requires Under 1910.95
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Your OSHA 300 Log Picks You for the Noise Inspection: What a Hearing Conservation Program Requires Under 1910.95

Compliance officers open a noise inspection by reading your OSHA 300 Log for threshold shifts. Here is what 1910.95 requires of a hearing conservation program.

by iSi Environmental

A noise inspection does not start with a sound level meter. Under the Kansas City region’s noise emphasis directive, it opens with a document review: the exposure monitoring program, the hearing conservation program, the 1910.1020 access records, and the OSHA 300 Logs, read specifically for standard threshold shifts (CPL 02-11-01L). The walkaround comes after.

That sequence has a consequence most plants never work out. The hearing loss case you correctly recorded on your own 300 Log is an input to the inspection that reads it, and the Chicago region’s version of the program selects establishments by hearing loss rate (CPL 04-00-27). That is no argument for under-recording, a separate violation, but for fixing the exposure before the shift happens. Twelve questions, answered first.

When does a hearing loss case have to go on the OSHA 300 Log?

Only when two conditions are both true. 29 CFR 1904.10(a) requires a work-related standard threshold shift and a total hearing level of 25 dB or more above audiometric zero, averaged at 2000, 3000 and 4000 Hz in the same ear as the shift. A standard threshold shift by itself is not recordable.

Employers miss this both ways. Some never run the audiograms against 1904.10, because the vendor sends a report and nobody owns the step after it. Others record every shift the vendor flags, skipping the 25 dB test. Where a confirming retest confirms the shift, you have 7 calendar days to record the case (1904.10(b)(4)).

Can I age-adjust an audiogram before recording a hearing loss case?

Partly, and the asymmetry is what trips people. Under 1904.10(b)(3) you may age-adjust using Tables F-1 or F-2 of 1910.95 Appendix F when determining whether a standard threshold shift occurred. You may not age-adjust when determining whether total hearing level has reached 25 dB above audiometric zero.

Two determinations, two rules, run on the same audiogram minutes apart. Carry the age correction into both and you under-record; refuse it in both and you over-record. Keep the steps separate in the review procedure, and keep the worksheet.

Is my Kansas, Missouri or Oklahoma plant inside an OSHA noise emphasis program?

It depends on the region, and the picture moved three directions inside five months. Region VII (Iowa, Kansas, Missouri, Nebraska) has run CPL 02-11-01L since February 28, 2022. Region VI (New Mexico, Oklahoma, Texas) has a newer listed directive, DAL-CPL-04-00-004. Region VIII (Colorado) runs CPL 2022-02.

Region VII’s directive carries an expiration date of October 1, 2026 on its own face, OSHA has published no successor, and osha.gov still lists CPL 02-11-01L as the current directive number with no cancellation note (directive record). All three are true. OSHA extends emphasis programs by memo without reposting, and the directives listing shows such an extension on another region’s noise program. Treat Region VII as unsettled, not retired.

Region VI is the opposite signal: the listing carries DAL-CPL-04-00-004, Regional Emphasis Program for High Noise in Manufacturing Industries, dated July 7, 2026. Its PDF was not retrievable, so its effective date, expiration and NAICS targeting are unverified here.

Region VII’s published targeting is verifiable: foundries, machine shops and fabricated metal, structural metals, plastics, wood products, food manufacturing, aerospace products and power generation, plus seven construction categories. iSi covered the earlier reissue in this note on the noise emphasis program. As a methodological comparison only, in a region iSi does not serve, Chicago’s Region V screen selects on hearing loss rate: 8.6 cases per 10,000 full-time manufacturing workers, six times the all-private-industry rate of 1.4.

What exposure level triggers an OSHA hearing conservation program?

An 8-hour time-weighted average of 85 dBA, or equivalently a 50 percent dose, under 1910.95(c)(1). That is the action level, 5 dB below the 90 dBA permissible exposure limit. The program obligation attaches below the legal limit, and the exposure is computed without regard to any attenuation from hearing protectors.

So a plant can be fully compliant with the exposure limit and still owe a complete program. Most noise findings in manufacturing are not overexposures but program deficiencies between 85 and 90 dBA, above the trigger and under the ceiling. No headcount threshold applies either: a 12-person machine shop with one employee over 85 dBA owes the same program a 900-person plant owes.

What are OSHA’s permissible noise exposure limits?

90 dBA for an 8-hour day under Table G-16, the allowed duration halving for roughly every 5 dB: 95 dBA for 4 hours, 100 for 2, 105 for 1, 110 for 30 minutes, 115 dBA for 15 minutes or less (1910.95(a) and Table G-16). Impulse or impact noise must not exceed a 140 dB peak sound pressure level.

Those limits date to OSHA’s 1971 adoption and have not moved. NIOSH recommends 85 dBA with a 3 dB exchange rate instead, worked out with the lifetime risk figures in the exchange rate post. Roughly 27 million U.S. workers are in hazardous noise annually (NIOSH).

Do hearing protectors count toward compliance with the noise PEL?

Not for the trigger, and not as a substitute for controls. 1910.95(c)(1) computes the action-level exposure without regard to attenuation, and 1910.95(b)(1) requires feasible administrative or engineering controls first, with personal protective equipment used when controls do not bring exposure within Table G-16.

Protectors carry obligations of their own: under 1910.95(j)(2) and (j)(3) you evaluate attenuation for the specific environment using the Appendix B methods and reach 90 dBA TWA, or 85 dBA for anyone who has had a shift.

Who is exempt from OSHA’s hearing conservation requirements?

One group only. Under 1910.95(o), paragraphs (c) through (n), which is the entire hearing conservation program, do not apply to employers engaged in oil and gas well drilling and servicing operations. Those employers still owe the Table G-16 limits and the controls-first requirement in (b)(1).

No small-business exemption exists. If you have never monitored you cannot know whether you owe the program: 1910.95(d)(1) obligates monitoring whenever information indicates exposures may reach the action level. If two people an arm’s length apart raise their voices to be understood, that area is likely near 85 dBA.

How soon after hire does the baseline audiogram have to happen?

Within 6 months of the employee’s first exposure at or above 85 dBA, under 1910.95(g)(5)(i), preceded by at least 14 hours free of workplace noise exposure. If you use a mobile test van the deadline extends to 1 year, but hearing protectors become mandatory for any period beyond the first 6 months.

The 14-hour quiet period in (g)(5)(iii) is the detail that quietly ruins programs: a baseline captured at the end of a shift records a temporary shift as true hearing, so every audiogram after it is compared to a depressed baseline. Method is prescribed: 1910.95(h)(1) requires pure tone air conduction testing at 500 through 6000 Hz, each ear separately, which is why booth-less bone conduction platforms do not satisfy it (more here).

What has to happen after a standard threshold shift?

Written notice to the employee within 21 days of the determination, under 1910.95(g)(8)(i). Then fit or refit hearing protectors, retrain the employee, require protector use, and refer for clinical evaluation where needed. An optional retest within 30 days may be substituted as the annual audiogram (1910.95(g)(7)(ii)).

A shift is an average change of 10 dB or more at 2000, 3000 and 4000 Hz in either ear, relative to baseline (1910.95(g)(10)(i)), and that employee’s attenuation target drops from 90 dBA TWA to 85. The follow-up steps are excused only where a physician or licensed audiologist determines the shift is neither work-related nor aggravated by noise. Run the 1904.10 evaluation separately.

How often does noise monitoring have to be repeated?

There is no fixed interval. 1910.95(d)(3) requires repeat monitoring whenever a change in production, process, equipment or controls either exposes additional employees at or above the 85 dBA action level or renders existing hearing protector attenuation inadequate. The trigger is the change, not the calendar.

That makes any new press, line rearrangement or ventilation change a re-monitoring event. 1910.95(d)(1) and (d)(2) require personal sampling where area monitoring is inappropriate, integration of all sound from 80 to 130 dB, and calibrated instruments. Then notify each employee at or above 85 dBA and let affected employees observe ((e) and (f)).

How long do noise and audiometric records have to be kept?

Two different periods, both in 1910.95(m)(3). Noise exposure measurement records: 2 years. Audiometric test records: the entire duration of the affected employee’s employment, after which they transfer to any successor employer. Both are among the first documents a compliance officer requests in a noise inspection.

Content is specified. Each audiometric record carries the employee’s name and job classification, the audiogram date, the examiner’s name, the audiometer’s last calibration date, and the most recent noise exposure assessment. A file of printouts with no exposure assessment attached is incomplete even when the test was perfect.

Is OSHA about to change the noise standard?

No proposal is pending. The hearing conservation amendment, paragraphs (c) through (n), was finalized in 1983 and has not been substantively amended since, and 1910.95 appears on none of the 23 rulemakings listed on OSHA’s deregulatory rulemaking page. The standard is 43 years old in its current form and is moving in neither direction.

The pressure is external rather than regulatory. NIOSH puts about 22 million U.S. workers in contact with ototoxic chemicals annually, an interaction this standard does not address and which iSi covers in the ototoxicity post. A static standard does not mean static exposure science.

What a 1910.95 finding costs in 2026

A serious or other-than-serious violation carries a maximum of $16,550 per violation, a willful or repeat violation up to $165,514, with a willful minimum of $11,823. Those are the 2025 amounts carried forward unadjusted into 2026, because the Bureau of Labor Statistics never produced the October 2025 CPI-U figure the statutory calculation requires and the statute provides no alternative (OSHA memorandum, May 21, 2026). Penalties did not rise this year; iSi has the full federal picture in the penalty freeze post.

The count of findings moves the arithmetic, not the ceiling: a program failing on monitoring, baseline timing, attenuation evaluation, training and recordkeeping is five items, not one.

What the enforcement picture actually looks like right now

The current data cuts against urgency, so it belongs here. Federal enforcement capacity is contracting. Inspections ran 23,531 from April through September 2025 against 29,229 a year earlier, a 20 percent drop, willful citations fell 42 percent, and inspector headcount stood at 736 in January 2026 against 846 in February 2024 per the DOL Inspector General (OSHA statistics). Penalty maximums did not increase, small-employer exposure fell in 2025 as the 70 percent size reduction expanded to employers with 1 to 25 employees (Field Operations Manual Chapter 6), and Region VII’s directive carries an expiration date now passed with no published successor. 1910.95 is not in OSHA’s top ten most cited standards, and no primary source publishes a national citation count or average penalty for it.

The signals running the other way are just as real. Region VI issued a new noise directive dated July 7, 2026, and noise programs appear in nine of OSHA’s ten regions, the agency’s most saturated emphasis topic. Any complaint or referral alleging noise gets a focused noise health inspection under CPL 02-11-01L regardless of NAICS code, and complaints do not track inspection volume. NIOSH stays 5 dB more protective than the exposure limit, about 53 percent of noise-exposed workers do not wear protection, and nothing has surfaced narrowing this standard’s scope.

The conclusion is not that enforcement is coming for you. It is that the obligations are self-executing: the 21-day notice, the 6-month baseline, the 7-day recording deadline and the annual audiogram run off your calendar whether or not anyone inspects.

The hearing conservation program is eight deadlines, not one binder

These programs fail as schedules, not as policies. What lapses is employee-specific and recurring:

  1. 6 months from first exposure at or above 85 dBA: baseline audiogram, after 14 hours of quiet.
  2. 12 months from baseline, then annually: audiogram compared to baseline.
  3. 21 days from a threshold shift determination: written notice to the employee.
  4. 30 days from the annual audiogram: optional confirming retest.
  5. 7 calendar days from a confirming retest: record the case where 1904.10(a) is met.
  6. Annually: training under 1910.95(k)(2) on noise effects on hearing, protector types and their attenuation, selection, fitting and care, and audiometric testing procedures, updated as equipment changes. Note the letter: training is (k); paragraph (j) is hearing protector attenuation.
  7. Annually: audiometer acoustic calibration, plus a daily functional check. Every 2 years: exhaustive calibration (1910.95(h)(5)).
  8. On any production, process, equipment or control change: repeat noise monitoring. Post the standard where employees can reach it (1910.95(l)).

Where this gets handled

iSi Environmental’s industrial hygiene team has run noise dosimetry in 40 states since 2004, across 223 engagements on this standard, in the categories Region VII’s directive names: foundries, machine shops, aerospace fabrication and wood products.

The work is specific. Calibrated full-shift dosimetry on the workers with the highest potential exposure. An attenuation evaluation against measured levels, not the label number on the box. A read of the audiometric files against both the 1910.95 follow-up steps and the 1904.10 criteria. That scope typically starts at $4,050, roughly a quarter of the maximum on one serious finding. The obligations recur, so iSi’s EHS COOP retainer is built for that pattern. In south central Kansas, start with industrial hygiene in Wichita; on the Missouri and Kansas river corridor, industrial hygiene in Kansas City.

Put three things on one table: two years of noise data, baseline dates for everyone hired since, and the 300 Log. Whatever you cannot reconcile, an inspector reconciles for you. Call iSi at (316) 264-7050 to schedule a noise dosimetry assessment and program review.

Frequently Asked Questions

What exposure level triggers an OSHA hearing conservation program?

An 8-hour time-weighted average of 85 dBA, the action level in 29 CFR 1910.95(c)(1), computed without regard to hearing protector attenuation. That is 5 dB below the 90 dBA permissible exposure limit, so a fully compliant plant can still owe the complete program.

When does a hearing loss case go on the OSHA 300 Log?

Only when there is a work-related standard threshold shift and total hearing level is 25 dB or more above audiometric zero in the same ear (29 CFR 1904.10). Record within 7 calendar days of a confirming retest.

How long do noise and audiometric records have to be kept?

Noise exposure measurement records for 2 years; audiometric test records for the entire duration of the affected employee’s employment (1910.95(m)(3)).

Sources

All verified 2026-10-30.