Preventing occupational hearing loss starts at the noise source, not at the worker's ear. OSHA 1910.95 embeds the hierarchy of controls into its requirements. According to CDC/NIOSH, approximately 22 million U.S. workers face hazardous noise annually — and virtually all occupational hearing loss is preventable with proper implementation of this hierarchy.
The Noise Hierarchy of Controls
| Level | Example | OSHA Requirement |
|---|---|---|
| Engineering controls | Acoustic enclosures, vibration isolation, quieter equipment | Required above 90 dBA PEL where feasible |
| Administrative controls | Job rotation, reduced shift duration, scheduled quiet periods | Required above 90 dBA PEL where feasible |
| HPD | Earplugs, earmuffs with verified attenuation | Available at 85 dBA; mandatory above 90 dBA PEL or after STS |
| Audiometric surveillance | Annual audiograms; STS detection | Required for all workers at or above 85 dBA action level |
The Six Required Program Elements
- Noise monitoring — Characterize each job classification's actual exposure
- Audiometric testing — Baseline at hire; annual comparison; STS detection within 21 days
- Hearing protection devices — Variety at no cost; mandatory at PEL; attenuation verified
- Training — Annual training on noise effects, HPD use, audiometric purpose
- Recordkeeping — Monitoring records 2 years; audiometric records duration of employment
- Access — Workers and OSHA can access records within required timelines
Why HPD Alone Doesn't Prevent Hearing Loss
HPD reduces noise exposure only when worn correctly throughout the entire exposure period. Workers who remove earplugs briefly in high-noise areas negate a significant share of their protection. Individual fit testing identifies workers who are not achieving adequate attenuation with their selected HPD before their audiogram reveals the failure. See: HPD fit testing: complete employer guide.
The Audiometric Program as the Prevention Safety Net
Even with controls and HPD, some workers develop threshold shifts. Annual audiometric surveillance catches the Standard Threshold Shift (10 dB average at 2000, 3000, and 4000 Hz) when it first appears — while there is still time to intervene by refitting HPD, adding engineering controls, or reassigning the worker. The audiogram is the evidence the prevention program is working, and the early warning when it isn't. See: standard threshold shift: OSHA definition and action steps.
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