The General Duty Clause and Noise Below 85 dBA

OSHA's noise rule under 29 CFR 1910.95 is built around two numbers: 85 dBA, where a hearing conservation program becomes mandatory, and 90 dBA, the permissible exposure limit itself. Employers who measure noise below 85 dBA sometimes treat the question as closed, no monitoring number, no obligation. That's usually right, but not always, because OSHA has a separate authority it can reach for when a workplace has a real noise hazard that the specific standard doesn't quite capture.

What triggers OSHA's hearing conservation program at 85 dBA?

Under 29 CFR 1910.95, an employer must implement a full hearing conservation program, monitoring, audiometric testing, hearing protection, training, and recordkeeping, whenever employee noise exposure equals or exceeds an 8-hour time-weighted average of 85 dBA. That 85 dBA figure is called the action level, and it sits below the 90 dBA permissible exposure limit specifically because OSHA wants the conservation program running before exposures reach the level that's actually prohibited. A facility with exposures consistently at 87 or 88 dBA is fully compliant on the noise limit itself, but is still required to run the entire conservation program because it crossed the lower action level.

What is the General Duty Clause, and when does it apply to noise?

The General Duty Clause, Section 5(a)(1) of the OSH Act, requires employers to provide a workplace free from recognized hazards that are causing or likely to cause death or serious physical harm, and OSHA uses it to address hazards that aren't covered by a specific standard. For noise, that means the General Duty Clause isn't a backstop that lowers the 85 dBA action level for routine 8-hour exposures, the 1910.95 standard already governs that situation directly. Where the General Duty Clause becomes relevant is a workplace with a documented noise hazard that the measurement methodology in 1910.95 doesn't neatly capture, such as short-duration but very high-intensity impulse noise, or a combination of noise sources that a standard time-weighted-average calculation understates relative to the real risk employees face.

Does exposure below 85 dBA ever create an obligation?

Exposure situation	1910.95 obligation	General Duty Clause exposure
8-hour TWA at or above 85 dBA	Full hearing conservation program required	Not applicable, specific standard governs
8-hour TWA below 85 dBA, no unusual hazard	No program required under 1910.95	Minimal, standard exposure is presumed adequately addressed
Below 85 dBA TWA but with recognized impulse or peak hazard	May not be captured by the TWA calculation alone	Employer should evaluate whether a recognized hazard exists regardless of the TWA number
Documented employee hearing loss with exposure below 85 dBA	No automatic trigger under 1910.95	Fact pattern OSHA could examine under the General Duty Clause

Why measuring only the 8-hour average can miss a real hazard

Time-weighted averaging smooths a workday's noise into a single number, which works well for steady industrial noise but can understate the risk from short bursts of very high intensity sound, like a stamping press cycle or a nail gun, that spike well above 85 or even 90 dBA for a few seconds at a time. A shift that averages out to 82 dBA over 8 hours can still include repeated peaks that a hearing conservation professional would flag as hazardous on their own terms, independent of what the daily average says. This is the scenario where the General Duty Clause has room to operate, because the specific standard's TWA-based trigger wasn't designed to capture that kind of exposure pattern, and OSHA's broader authority to address recognized hazards can still reach it.

What should an employer with borderline exposure actually do?

An employer sitting just under the 85 dBA action level shouldn't treat that as a reason to stop paying attention to noise. A dosimetry survey that shows exposures in the low 80s with occasional impulse peaks is a signal to keep monitoring, not a compliance finish line, particularly in facilities where equipment changes, added shifts, or new processes could push exposures upward without anyone re-measuring. Voluntarily extending hearing protection availability and periodic monitoring below the mandatory threshold is one of the cheapest ways to stay ahead of both the specific standard and any General Duty Clause exposure, and it avoids the scenario where an employer has to explain after an injury why they knew exposures were close to the line and did nothing further.

How Foster approaches borderline noise exposure for hearing conservation clients

When we run noise dosimetry for a client and the results come back close to but under 85 dBA, we flag it rather than close the file, because a measurement that's borderline this year can be over the line next year with no change in the underlying equipment, just wear, added shifts, or a process tweak nobody thought to re-survey for. As a mobile provider working across Ohio, Kentucky, and Indiana, we see this most often in facilities that measured once years ago, got a result under the action level, and never repeated the survey. Our audiometric testing and hearing protection recommendations don't wait for a client to cross 85 dBA on paper before we start tracking their trend, because the point of a hearing conservation program is preventing hearing loss, not hitting a specific number on a report.

Frequently asked questions

Is the General Duty Clause used often for noise complaints?

Not routinely. OSHA generally relies on the specific 1910.95 standard for noise enforcement, since it directly addresses the hazard with a defined measurement method and action level. The General Duty Clause is reserved for situations the specific standard doesn't clearly reach.

Can an employer be cited for noise exposure below 85 dBA?

It's uncommon but not impossible if OSHA can show a recognized noise hazard causing or likely to cause serious harm that the specific standard's TWA-based trigger didn't capture. Most compliant employers with exposures genuinely below 85 dBA and no unusual noise pattern won't face this.

Does impulse noise get measured differently than steady noise?

Impulse and impact noise require separate consideration from steady-state time-weighted averaging, since a brief but intense spike can represent a real hazard that an averaged number doesn't reflect well. Employers with this kind of noise source should have it specifically evaluated rather than relying on a standard TWA survey alone.

Should we still offer hearing protection if our exposures are under 85 dBA?

OSHA doesn't require it below the action level, but voluntarily making hearing protection available is inexpensive and reduces both the health risk and any later argument that a known noise issue was ignored.

How often should noise levels be re-measured if we're currently under the action level?

There's no fixed re-survey interval in the standard, but any meaningful change in equipment, process, staffing, or shift length is a reasonable trigger to re-measure, since a borderline result from years ago may no longer reflect current conditions.

Sources

• OSH Act Section 5, General Duty Clause (OSHA.gov)
• Occupational Noise Exposure, Standards (OSHA.gov)
• Occupational Noise Exposure, Overview (OSHA.gov)

Foster Special Instruments provides on-site hearing testing and noise dosimetry, hearing conservation program support, and calibration services across the Cincinnati region. Related reading: our OSHA hearing conservation program checklist. Not sure where your facility stands on the action level? Request a quote for a noise survey.