Legal Requirements for Workplace Noise: Managing Exposure to Noise and Implementing Health Surveillance

Noise is one of the most common workplace hazards, yet is often underestimated because its effects are gradual rather than immediate. Prolonged exposure to excessive noise can result in permanent hearing damage, making it essential for employers to understand noise action levels and implement effective noise management including health surveillance.

This article explains the legal framework for workplace noise, the health risks of prolonged exposure, and the practical and operational challenges organisations face when trying to reduce noise levels at work.

Protecting workers and ensuring compliance

Workplace noise becomes hazardous when employees are exposed to loud sounds overtime. Common high risk sectors include:

• Construction
• Manufacturing
• Engineering
• Aviation
• Agriculture
• Events

Prolonged exposure to excessive noise can cause:

• Noise induced hearing loss (NIHL)
• Tinnitus (ringing, buzzing or whistling in the ears)
• Fatigue, stress and reduced concentration
• Increased risk of accidents due to poor communication

Because hearing damage develops gradually and is irreversible, early detection and prevention are critical.

Legal Requirements for Noise Exposure at Work: Noise Action Levels Explained

Under the Control of Noise at Work Regulations 2005, employers must take specific actions when employee exposure reaches defined levels.

Lower exposure action values

• 80 dB(A) daily or weekly average
• 135 dB (C) peak sound pressure

Examples of equipment that can easily reach the lower action levels:

• Fork lift trucks
• Air compressors
• Vacuum or extraction systems
• Conveyor systems

At this level employers must assess the risk, provide information and training and make hearing protection and consider health surveillance.

Upper exposure action levels

• 85 dB(A) Daily or weekly average
• 137 dB(C) peak sound pressure

Examples of equipment frequently reaching or exceeding this level:

• Angle grinders
• Impact wrenches
• Hammer and rotary drills
• Bench grinders
• Press brakes and power presses
• Injection molding machines

Without effective controls, daily exposure to this and similar equipment can rapidly exceed the legal limit

At this level, employers must:

• Implement a program to reduce noise exposure,
• Clearly identify hearing protection zones (mandatory hearing protection zone)
• Ensure hearing protection is being used and provide mandatory health surveillance (audiometric testing)

If there is a reasonable likelihood that workplace noise could reach or exceed the action level, it is advised to engage with an external specialist to perform a formal noise assessment.

Exposure Limit Values: Legal Maximums

• 87 dB(A) Daily or weekly exposure
• 140 dB (C) peak sound pressure

These limits must not be exceeded, taking into account the protection provided by hearing protection. Exceeding exposure limit values is a breach of legal duties and requires immediate action.

Examples of equipment generating and possibly exceeding noise at this level:

• Jack Hammers
• Piling rigs
• Stone cutting and masonry saws
• Large industrial shredders
• Turbines and generators

Noise at this level can cause damage in a short period of time and require strict control measures, including engineering controls and enforced hearing protection.

Short Duration but High-Peak Noise Sources

Even short bursts of noise can reach dangerous peak sound pressure levels:

• Cartridge operated tools
• Metal stamping and punch presses
• Explosive power fixing tools
• Nail guns

Peak noise can exceed 135-137 dB(C) and poses an immediate risk to hearing if not controlled.

Workplace Noise Health Risks and Long-Term Workforce Effects

Long‑term exposure to workplace noise does not only affect hearing. It is increasingly associated with:

• Chronic fatigue and stress
• Reduced productivity and concentration
• Increased accident risk due to impaired communication
• Employee dissatisfaction and complaints regarding working conditions

From an organisational perspective, unmanaged noise exposure can contribute to employee complaints about noise levels, higher absence rates and potential regulatory enforcement.

Practical Challenges in Reducing Workplace Noise Levels

While legal duties are clear, many organisations face real‑world difficulties in reducing workplace sound levels, including:

• Cost of implementing noise control solutions, such as acoustic enclosures or equipment replacement
• Operational constraints where noisy machinery is essential
• Legacy equipment that predates modern noise‑reduction standards
• Employee resistance to hearing protection due to comfort or communication issues

Despite these challenges, regulators expect employers to demonstrate that they have reduced noise to as low as reasonably practicable (ALARP). It is thus a legal duty from an employer’s perspective.

What is Noise Health Surveillance?

Health surveillance for noise levels involves regular hearing tests (audiometry) to detect early signs of hearing damage. It is particularly important where exposure reaches upper exposure action values or where employees are otherwise at risk.

A typical noise health surveillance program includes:

• Baseline hearing tests
• Periodic audiometric testing (annually or bi-annually)
• Review of results from a competent person
• Clear action where hearing deterioration is identified
• Secure confidential record keeping

Health surveillance helps to identify whether existing noise controls are effective or need improvement.

Conclusion

Many commonly used industrial tools and equipment can reach or exceed action levels, often without obvious warning signs. Identifying noisy equipment, assessing exposure and linking controls to health surveillance is essential to protect workers’ hearing and for legal compliance.