How to Audit Your Hearing Conservation Program

Noise is a common workplace hazard in manufacturing, construction, transportation, utilities, and industrial maintenance. From air compressors and pumps to power tools and heavy equipment, many operations expose employees to noise levels that can cause permanent hearing damage over time.

Unlike an injury that happens in an instant, noise-induced hearing loss often develops gradually. Employees may not recognize the damage until it begins affecting conversations, communication on the job, or their quality of life outside work.

For employers, preventing hearing loss requires more than providing earplugs and scheduling annual training. A successful hearing conservation program includes exposure monitoring, appropriate controls, hearing protection, audiometric testing, employee education, and accurate records.

Regularly reviewing these elements helps safety managers identify gaps before they become larger problems. It also helps ensure that hearing protection practices keep pace with changes in equipment, work processes, and employee responsibilities.

This guide explains the key requirements of OSHA’s general-industry noise standard and provides a practical checklist for reviewing your hearing conservation program.

Understanding OSHA’s Occupational Noise Requirements

OSHA’s Occupational Noise Exposure Standard, 29 CFR 1910.95, establishes requirements for managing workplace noise in general industry. Construction and other work environments may be subject to different or additional requirements.

Two important exposure thresholds are the action level and the permissible exposure limit.

The 85 dBA Action Level

When employee noise exposure equals or exceeds an eight-hour time-weighted average (TWA) of 85 decibels on the A-weighted scale, employers must implement a hearing conservation program under OSHA’s general-industry standard.

The program includes:

• Monitoring employee noise exposure.
• Providing audiometric testing at no cost to employees.
• Making appropriate hearing protectors available.
• Providing annual hearing conservation training.
• Maintaining required exposure and audiometric records.

The 85 dBA action level is a trigger for the hearing conservation program. It is not a guarantee that exposure below that level is harmless in every circumstance.

The 90 dBA Permissible Exposure Limit

OSHA’s general-industry standard establishes a permissible exposure limit (PEL) of 90 dBA over eight hours, using its specified measurement criteria.

When noise exposure exceeds the levels permitted under the standard, employers must use feasible engineering or administrative controls. If those controls cannot reduce exposure sufficiently, hearing protection must be provided and used as required by the standard.

OSHA uses a five-decibel exchange rate for its permissible exposure calculations. In comparison, the National Institute for Occupational Safety and Health (NIOSH) recommends an 85 dBA eight-hour exposure limit using a more protective three-decibel exchange rate.

Under the NIOSH approach, each three-decibel increase represents a doubling of sound energy and cuts the recommended exposure duration in half.

Employers can review the NIOSH guidance on understanding noise exposure to learn more about exposure limits and measurement settings.

Understanding the difference between regulatory requirements and recommended practices helps employers build programs that meet applicable standards while taking a more protective approach where appropriate.

Five Core Areas to Review During a Hearing Conservation Audit

A hearing conservation audit should evaluate how the program operates in practice, not just whether the required documents exist.

1. Noise Monitoring and Exposure Assessments

An effective program starts with understanding where hazardous noise occurs and which employees may be exposed.

OSHA requires employers to develop and implement a monitoring program when information indicates that employee exposure may equal or exceed the 85 dBA action level.

Depending on the work environment, monitoring may include area noise surveys, personal dosimetry, or a combination of both.

During your audit, review the following:

• Noise exposure records: Confirm that measurements identify employees who need to be included in the hearing conservation program.
• Equipment and work areas: Review noise levels around pumps, compressors, generators, power tools, production equipment, and other significant sources.
• Personal exposure monitoring: Determine whether individual sampling is needed when employees move between work areas or experience changing noise levels throughout a shift.
• Changes in operations: Check whether new equipment, modified processes, or changes to existing controls require additional monitoring.

Noise assessments should reflect actual working conditions. A measurement taken in an empty facility or during a period of reduced production may not accurately represent employee exposure during a typical shift.

For additional information, OSHA provides guidance on monitoring noise levels.

2. Engineering Controls and Work Practices

Hearing protection is an important part of noise prevention, but reducing noise at its source should also be a priority.

OSHA requires feasible engineering or administrative controls when employee exposure exceeds the levels established in its noise standard.

Engineering controls may include:

• Installing acoustic enclosures or sound barriers.
• Using vibration isolation to reduce noise from equipment.
• Maintaining machinery to address excessive noise caused by worn or damaged components.
• Replacing noisy equipment with quieter alternatives when practical.

Administrative controls may include adjusting work schedules, limiting the time employees spend in high-noise areas, or restricting access to noisy operations.

During an audit, review whether identified noise hazards have been evaluated for possible controls and whether existing controls remain effective.

Pay particular attention to temporary work areas, maintenance activities, and mobile operations where noise conditions may differ from those in permanent facilities.

3. Hearing Protection Selection and Fit

When employees are exposed to noise at or above the 85 dBA action level, OSHA requires employers to provide suitable hearing protectors at no cost. Employees must also have the opportunity to select from a variety of appropriate protectors.

Common options include foam earplugs, reusable earplugs, earmuffs, and other suitable devices.

The appropriate choice depends on the noise environment, required attenuation, comfort, compatibility with other personal protective equipment, and the employee's ability to use the device correctly.

During your audit, confirm that:

• Hearing protectors are available where employees need them.
• Employees have access to suitable options.
• Devices are fitted correctly and used according to training and workplace requirements.
• Damaged, worn, or unsuitable protectors are replaced.
• The selected protectors provide adequate attenuation for the actual noise exposure.

Noise Reduction Ratings (NRRs) can help compare hearing protectors, but the labeled rating does not necessarily represent the protection an individual employee will achieve in the field. OSHA provides specific methods for evaluating hearing protector attenuation in Appendix B of its noise standard.

Individual quantitative fit testing can provide additional information by measuring the attenuation achieved by a specific employee wearing a specific device. Although this is a useful way to verify fit and identify training needs, it is not a universal requirement under OSHA's general-industry noise standard.

The goal is to provide effective protection without creating unnecessary communication difficulties or encouraging employees to remove their hearing protectors.

4. Audiometric Testing and Standard Threshold Shifts

Audiometric testing helps identify changes in employee hearing over time. For employees covered by the hearing conservation program, OSHA requires a baseline audiogram and annual audiograms thereafter.

The baseline provides a reference point for comparing future test results.

An important part of the review is identifying a Standard Threshold Shift (STS). Under OSHA's standard, an STS is a change in hearing threshold relative to the baseline audiogram, averaging 10 dB or more at 2,000, 3,000, and 4,000 Hz in either ear.

If an STS is identified, employers must follow the standard's requirements for evaluating the results, notifying the employee, and taking appropriate follow-up action.

Depending on the circumstances, follow-up may include:

• Notifying the employee in writing within 21 days of determining that an STS has occurred.
• Reviewing hearing protector selection, fit, and use.
• Considering whether additional evaluation or referral is appropriate.
• Evaluating whether the hearing shift is work-related and whether it meets OSHA recordkeeping criteria.

An STS does not automatically mean the case must be recorded on the OSHA 300 Log. Recordability depends on the applicable criteria, including the employee's hearing level, the change from baseline, and work-relatedness.

During your audit, confirm that baseline and annual audiograms are available, results have been reviewed, and required follow-up actions are documented.

5. Training, Documentation, and Recordkeeping

Employees need to understand why hearing protection matters, how to use it correctly, and how to recognize potential noise hazards.

OSHA requires annual training for employees included in the hearing conservation program. Training must cover the effects of noise on hearing, the purpose and use of hearing protectors, and the purpose and procedures of audiometric testing.

A review of your training records should confirm that:

• Employees receive training at the required intervals.
• Training content reflects the hearing protectors and work processes used at the facility.
• Completion records are accurate and accessible.
• Employees receive instruction on selecting, fitting, using, and caring for hearing protectors.

Record retention is another important part of the audit. Under OSHA's general-industry noise standard, noise exposure measurement records must be retained for at least two years. Audiometric test records must be retained for the duration of the affected employee's employment.

Keep these requirements in mind when reviewing document storage, employee records, and procedures for retrieving information during an inspection.

An Additional Risk to Consider: Ototoxic Chemicals

Noise is not the only workplace hazard that can affect hearing. Certain chemicals, known as ototoxicants, can damage parts of the ear or make employees more susceptible to the harmful effects of noise.

Examples include certain solvents, such as toluene, styrene, and xylene, as well as some metals and their compounds, including lead and mercury compounds.

These substances may be present in industrial cleaners, degreasers, paints, coatings, fuels, and other materials used in manufacturing, transportation, construction, and maintenance.

The risk depends on factors such as the chemical involved, exposure level, and duration. Combined exposure to hazardous noise and ototoxic chemicals can increase the risk of hearing damage.

As part of a broader workplace health review, safety professionals should consider whether employees may encounter both noise and ototoxic chemicals. Review chemical inventories and Safety Data Sheets, evaluate exposure controls, and consult qualified occupational health professionals when additional assessment is needed.

NIOSH provides further information about chemical-induced hearing loss and workplace exposure.

The presence of an ototoxic chemical does not automatically trigger enrollment in OSHA's hearing conservation program regardless of noise exposure. However, it is an important consideration when evaluating the overall risk to employees' hearing.

A Practical Hearing Conservation Audit Checklist

Once you have reviewed the major program components, use this checklist to identify gaps and organize follow-up actions.

Noise exposure

• Current noise assessments reflect actual work conditions.
• Employees who meet the action-level criteria are identified.
• Changes to equipment, processes, and controls have been reviewed.

Noise controls and hearing protection

• Feasible engineering and administrative controls have been evaluated where required.
• Suitable hearing protectors are available at no cost.
• Employees know how to select, fit, use, and care for their protectors.
• Hearing protector attenuation is appropriate for the noise environment.

Audiometric testing

• Required baseline and annual audiograms are available.
• Results have been reviewed for standard threshold shifts.
• Required notifications and follow-up actions are documented.
• Potential recordable cases have been evaluated using OSHA's criteria.

Training and records

• Annual hearing conservation training is current.
• Completion records are accurate and accessible.
• Noise exposure records meet retention requirements.
• Audiometric records are retained for the required duration.

Additional workplace risks

• Potential ototoxic chemical exposures have been considered.
• Employees with combined noise and chemical exposures have been identified for appropriate evaluation.

For each gap identified, assign responsibility, establish a target completion date, and document the corrective action. A checklist is most useful when it leads to measurable improvements rather than becoming another document filed away after the review.

Frequently Asked Questions

When is a hearing conservation program required?

Under OSHA's general-industry noise standard, employers must implement a hearing conservation program when employee exposure equals or exceeds an eight-hour time-weighted average of 85 dBA, or an equivalent 50% noise dose, calculated according to the standard.

Does OSHA require annual hearing tests?

OSHA requires annual audiograms for employees whose noise exposures equal or exceed the action level and who are covered by the hearing conservation program. Audiometric testing must be provided at no cost to employees.

Are hearing protectors required at 85 dBA?

Employers must make hearing protectors available at no cost to employees exposed at or above an eight-hour TWA of 85 dBA. Under the standard, protectors must be worn in specified circumstances, including when required by the noise control provisions or when an employee at or above the action level has not yet established a baseline audiogram or has experienced an STS.

How long must hearing conservation records be kept?

OSHA requires noise exposure measurement records to be retained for at least two years. Audiometric test records must be retained for the duration of the affected employee's employment.

Is hearing protector fit testing required by OSHA?

OSHA's general-industry noise standard requires appropriate hearing protector selection, fitting, and use, but does not universally require individual quantitative fit testing. Fit testing can nevertheless help employers verify the protection achieved and identify opportunities for improved training.

Conclusion: Make Hearing Conservation an Ongoing Priority

Protecting employees from noise-induced hearing loss takes consistent attention to workplace conditions, effective controls, appropriate hearing protection, audiometric testing, and employee education.

A regular hearing conservation audit helps identify outdated assessments, missing records, training gaps, and opportunities to improve protection. It also helps ensure that procedures remain effective as equipment, work processes, and employee responsibilities change.

For organizations with multiple facilities, mobile employees, or changing work environments, consistent training and documentation practices can make it easier to maintain oversight and address gaps across locations.

Sentry Road helps organizations manage safety training and compliance documentation across their workforce. From keeping training records organized to supporting consistent safety training practices, we help companies stay on top of their training responsibilities. Learn more about our approach to safety and compliance training at Sentry Road.

A strong hearing conservation program is more than a regulatory obligation. It is an investment in employees' long-term health, effective communication, and a safer workplace.