Table of Contents
- 1. Baseline Audiometric Testing and Your Compliance Obligations
- 2. Annual Audiometric Testing Standards for Ongoing Monitoring
- 3. Noise Level Assessment and Exposure Monitoring Requirements
- 4. Employee Training on Hearing Protection Methods
- 5. Proper Hearing Protective Equipment Selection and Use
- 6. Required Follow-Up for Standard Threshold Shifts
- 7. Documentation and Record Keeping Best Practices
1. Baseline Audiometric Testing and Your Compliance Obligations
Noise-induced hearing loss remains one of the most common occupational injuries, yet many workplaces underestimate its impact. The damage is permanent, irreversible, and entirely preventable when you implement a proper hearing conservation program. OSHA’s occupational noise standard (29 CFR 1910.95) requires a hearing conservation program for any workplace where employees are exposed at or above an 8-hour time-weighted average (TWA) of 85 dBA. Understanding these seven core requirements isn't just about regulatory compliance; it's about protecting your team's long-term health and avoiding costly citations, workers’ compensation claims, and lost productivity. For the full training program behind these seven requirements, see our complete guide to hearing conservation safety training for workplace compliance.
Once an employee’s exposure is at or above the 85 dBA action level, OSHA requires a valid baseline audiogram within 6 months of first exposure (1910.95(g)(5)). If a mobile test van is used, the baseline may be obtained within 1 year, but the employee must wear hearing protectors from the 6-month point until the baseline is done. The baseline must be preceded by at least 14 hours without exposure to workplace noise; hearing protectors may be used to meet this requirement.
Audiometric tests must be performed by a licensed or certified audiologist, otolaryngologist, or other physician, or by a technician certified by the Council for Accreditation in Occupational Hearing Conservation (CAOHC) or who has demonstrated competence (1910.95(g)(3)). Testing covers at least 500, 1000, 2000, 3000, 4000, and 6000 Hz in each ear, and the result becomes the reference point for every later test.
Your obligations include ensuring tests are performed by a qualified person using properly calibrated equipment, keeping the results, and making records available to employees on request. Many safety managers overlook the documentation step, which can create serious gaps during OSHA inspections. Explaining baseline results to employees in practical terms is also a good practice that builds buy-in for the program.
What to do next: Schedule baseline tests promptly once noise monitoring shows exposure at or above 85 dBA. Train supervisors and HR staff on what counts as covered noise exposure so you don't miss anyone who should be tested.
2. Annual Audiometric Testing Standards for Ongoing Monitoring
Annual audiometric tests are the backbone of your hearing conservation program. They measure whether employees' hearing has changed from baseline and allow you to catch early warning signs of damage.
OSHA requires an audiogram at least annually after the baseline for every employee exposed at or above an 8-hour TWA of 85 dBA (1910.95(g)(6)). Annual tests follow the same procedures as the baseline, and each annual audiogram is compared to the baseline to determine whether a standard threshold shift has occurred.
A standard threshold shift (STS) is a change in hearing threshold, relative to the baseline, of an average of 10 dB or more at 2000, 3000, and 4000 Hz in either ear (1910.95(g)(10)); an allowance for aging may be applied. If an annual test shows an STS, the employer may obtain a retest within 30 days and use the retest result. Unless a physician determines the shift is not work-related or aggravated by occupational noise, the employee must be informed in writing within 21 days of the determination (1910.95(g)(8)).
Track these results consistently across your workforce. A spreadsheet or other recordkeeping system you maintain helps you identify trends, flag employees who need follow-up, and demonstrate due diligence if questioned.
What to do next: Establish a schedule that spreads testing throughout the year to avoid administrative bottlenecks. Communicate dates and expectations to employees well in advance so they can plan for the test without disrupting operations.
Get the complete strategic picture behind hearing conservation compliance in our guide to effective hearing conservation training for OSHA-regulated workplaces.
3. Noise Level Assessment and Exposure Monitoring Requirements
You cannot implement a hearing conservation program without knowing your actual noise levels. Under 1910.95(d), when information indicates that any employee’s exposure may equal or exceed an 8-hour TWA of 85 dBA, the employer must develop and implement a monitoring program to identify employees for inclusion in the hearing conservation program. Your employer, not individual workers, determines the hearing protection requirements for your workplace based on that noise monitoring.
Monitoring is not a one-time check. Use sound level meters or noise dosimeters, or hire an industrial hygienist, to measure noise during typical work activities. Be thorough: measure during peak production, different shifts, and varying conditions because noise fluctuates. Document everything, including equipment, location, time of day, and conditions.
If monitoring shows exposure at or above 85 dBA, the full hearing conservation program applies. Monitoring must be repeated whenever a change in production, process, equipment, or controls increases noise exposure enough that additional employees may be covered or the attenuation provided by their hearing protectors may be inadequate (1910.95(d)(3)). Employees exposed at or above 85 dBA must be notified of the monitoring results (1910.95(e)), and affected employees or their representatives may observe the monitoring (1910.95(f)).
Pay attention to impulse noise (sharp, sudden sounds from impact tools) and intermittent noise. OSHA requires that all continuous, intermittent, and impulsive sound levels from 80 to 130 dBA be integrated into the noise measurements (1910.95(d)(2)(i)). If your facility uses jackhammers, nail guns, rivet guns, or stamping equipment, make sure your measurement method captures impulse noise.
What to do next: If you're uncertain about noise levels, hire a qualified industrial hygienist or acoustical consultant; a professional assessment typically costs far less than the consequences of inadequate monitoring. Document all findings in writing and repeat assessments when operations change.
4. Employee Training on Hearing Protection Methods
OSHA requires a training program for all employees exposed at or above an 8-hour TWA of 85 dBA, repeated annually and updated as protective equipment and work processes change (1910.95(k)). Training must cover the effects of noise on hearing; the purpose of hearing protectors, the advantages, disadvantages, and attenuation of various types, and instructions on selection, fitting, use, and care; and the purpose of audiometric testing, with an explanation of the test procedures.
Effective training goes beyond handing out earplugs. Employees need to understand how noise damage accumulates, why their particular workplace presents a risk, and what happens if they don't use protection consistently. Many workers underestimate occupational hearing loss because the damage is silent and gradual; your training bridges that awareness gap.
Cover these topics in every session:
- How noise damages the inner ear and why damage is permanent
- The relationship between decibel levels and exposure time
- How to insert foam earplugs correctly (insertion depth and technique matter enormously)
- When to wear protection and why consistency is non-negotiable
- The limitations of different protection types
- How to care for reusable earplugs and when to replace them
- What to do if hearing protection is uncomfortable or doesn't fit well
- Why audiometric testing is done and what the test involves
Training should be language-appropriate and literacy-appropriate. Use visuals, demonstrations, and interactive elements. Many workers learn best by seeing and doing, not just listening to a lecture.
Conduct initial training before exposure and annual refresher training. Document who attended, what was covered, and when. Employers must also make a copy of the noise standard available to affected employees and post a copy in the workplace (1910.95(l)). If OSHA inspects and finds untrained employees in noise-exposed areas, that can result in a citation.
What to do next: Develop or purchase standardized training materials that cover OSHA specifics while remaining relatable to your workforce. National Safety Compliance’s Hearing Safety Training Video & Program (English and Spanish) includes a PowerPoint presentation, quiz, and attendance log to help you train efficiently and document each session, and Hearing Conservation Training Booklets come in packages of 10. Browse all hearing conservation training products.
Pair your hearing conservation program with OSHA's respirable crystalline silica training requirements, since both hazards frequently occur in the same high-noise environments.
5. Proper Hearing Protective Equipment Selection and Use
Selecting and using the right hearing protection is where theory meets reality. OSHA requires employers to make hearing protectors available at no cost to all employees exposed at or above an 8-hour TWA of 85 dBA, to replace them as necessary, and to ensure they are worn (1910.95(i)). Wearing them is mandatory for employees exposed at or above the 90 dBA permissible exposure limit, and for employees exposed at or above 85 dBA who have not yet had a baseline audiogram after 6 months or who have experienced an STS. Employees must be given the opportunity to select from a variety of suitable hearing protectors.
The two primary types are earplugs and earmuffs. Foam earplugs are affordable and convenient but only work if inserted properly; most workers insert them too shallowly, reducing effectiveness by half or more. Earmuffs are easier to fit correctly but can be uncomfortable during long shifts or warm weather. Many facilities use a combination: earplugs inside the facility and earmuffs for especially loud tasks.
Hearing protectors must attenuate employee exposure to an 8-hour TWA of 90 dBA or below, and to 85 dBA or below for employees who have experienced an STS (1910.95(j)). NIOSH recommends dual protection (earplugs plus earmuffs) when exposures exceed 100 dBA TWA.
Noise Reduction Rating (NRR) labels on protection equipment indicate lab-measured performance, but real-world results are typically much lower due to improper insertion, fit gaps, and employee variation, which is why OSHA guidance commonly derates the NRR by 50%. A foam earplug rated NRR 30 might deliver only 15 to 20 decibels of actual protection if not inserted correctly. Account for this when selecting equipment.
Individual fitting and selection matter. Some workers have small ear canals that make certain earplugs ineffective; others have difficulty with earmuff seals. Offer variety so each employee can find protection that fits well and that they'll actually wear consistently.
What to do next: Have trained personnel help each employee select and fit protection correctly. Provide multiple brands and types so employees have genuine options. Replace damaged or worn protection immediately; don't ask employees to reuse degraded equipment.
6. Required Follow-Up for Standard Threshold Shifts
When an annual audiogram shows a standard threshold shift, OSHA requires specific follow-up unless a physician determines that the shift is not work-related or aggravated by occupational noise (1910.95(g)(8)):
- Employees not using hearing protectors must be fitted with them, trained in their use and care, and required to use them.
- Employees already using hearing protectors must be refitted and retrained, and provided with protectors offering greater attenuation if necessary.
- The employee must be referred for a clinical audiological evaluation or an otological examination, as appropriate, if additional testing is necessary or if the employer suspects that a medical pathology of the ear is caused or aggravated by wearing hearing protectors.
- The employee must be informed of the need for an otological examination if a medical pathology of the ear unrelated to the use of hearing protectors is suspected.
If a later audiogram shows that the shift is not persistent, the employee must be informed of the new results, and hearing protector use may be discontinued for an employee exposed below 90 dBA.
Note that 1910.95 does not contain a medical removal requirement; some employers choose to reassign employees with worsening hearing to lower-noise work as a company practice. Separately, an STS must be recorded on the OSHA 300 log when the employee’s total hearing level is also 25 dB or more above audiometric zero, averaged at 2000, 3000, and 4000 Hz, in the same ear (29 CFR 1904.10).
Document all threshold shifts, notifications, referrals, medical opinions, and actions taken. This record demonstrates your commitment to employee health and provides protection if claims arise later.
What to do next: Establish clear procedures for responding to STS findings before you encounter one. Build relationships with occupational health providers who understand these requirements and can conduct timely evaluations.
7. Documentation and Record Keeping Best Practices
OSHA requires comprehensive documentation of your hearing conservation program, and the quality of your records can make or break compliance during an inspection.
Keep these documents organized and accessible:
- Baseline and annual audiometric test results for each employee (organized by employee name and date)
- Records of noise exposure assessments and sound level measurements (with dates, locations, equipment, and methodology noted)
- Training attendance logs including employee names, dates, topics covered, and trainer information
- Written notification letters to employees regarding threshold shifts, medical referrals, and follow-up appointments
- Medical evaluations and audiologist recommendations
- A written hearing conservation program policy describing your procedures, responsibilities, and timelines
- Records of hearing protection distributed (type, quantity, issue date, and employee receiving it)
Retention periods are set by 1910.95(m): keep noise exposure measurement records for at least 2 years and audiometric test records for the duration of the affected employee’s employment. Audiometric records must include the employee’s name and job classification, the test date, the examiner’s name, the date of the last acoustic or exhaustive calibration of the audiometer, and the employee’s most recent noise exposure assessment. Many facilities maintain digital copies to prevent loss and facilitate searches during inspections.
Auditing your records annually helps identify gaps before OSHA does. Walk through a few employees' files from start to finish and verify that every required step is documented. If you find missing baseline tests, lost training records, or undocumented threshold shifts, address them immediately.
What to do next: Develop a centralized record-keeping system, whether digital or physical, that tracks every requirement across all employees. National Safety Compliance training program kits include attendance logs and quizzes that fit directly into your training records.
Building and maintaining a hearing conservation program requires discipline, consistency, and attention to detail. The seven requirements outlined here work together: you assess noise, test baseline hearing, train employees, provide protection, monitor annually, respond to changes, and document everything. Skip any step and you create compliance gaps and leave employees vulnerable to preventable harm.
Safety managers juggle competing priorities, but hearing conservation is non-negotiable. Noise-induced hearing loss is cumulative and irreversible; an employee you protect today avoids permanent disability decades later.
Start with a noise assessment if you haven't done one recently. Schedule baseline testing for any new or untested employees. Ensure annual testing is locked into your compliance calendar. Train your team thoroughly and refit their protection. Most importantly, establish documentation habits that make your program auditable and defensible.
National Safety Compliance offers the Hearing Safety Training Video & Program and Hearing Conservation Training Booklets to support the training element of your program. For organizations training on many topics, the All Access Pass gives one trainer or supervisor unlimited use of 50+ courses to train the entire organization and includes all updates and new releases during the subscription period.
Confirm that hearing conservation training is properly scheduled in your annual OSHA training requirements roadmap to stay compliant through 2026.