COSHH: The Complete Guide to Chemical Safety at Work

The COSHH regulations UK are a key part of workplace health and safety law. They require employers to control substances that can harm workers’ health. Whether you run an office, construction firm, school, salon or manufacturing site, understanding COSHH is essential for legal compliance and employee protection. This guide explains what COSHH is, who needs it, and what steps businesses must take to meet their obligations.

What Is COSHH?

COSHH stands for the Control of Substances Hazardous to Health. The regulations were introduced under the Health and Safety at Work etc. Act 1974 and require employers to prevent or reduce workers’ exposure to hazardous substances.

Hazardous substances can include:

• Chemicals

• Cleaning products

• Fumes

• Dust

• Vapours

• Gases

• Biological agents (such as bacteria and viruses)

• Substances produced during work activities (e.g. wood dust, welding fumes)

If a substance can cause ill health through inhalation, skin contact or ingestion, it is likely covered by COSHH regulations UK.

Who Needs to Comply with COSHH Regulations UK?

Most UK workplaces must comply with COSHH regulations UK. If your business uses, creates or stores hazardous substances, COSHH will apply.

This includes:

• Offices using cleaning chemicals or printer toner

• Hair and beauty salons using dyes and treatments

• Construction companies dealing with dust and cement

• Manufacturing sites handling industrial chemicals

• Healthcare providers exposed to biological hazards

• Schools and laboratories using science chemicals

Even small businesses and sole traders have duties under COSHH if hazardous substances are involved.

Employer Responsibilities Under COSHH

Employers must take several steps to comply with COSHH regulations UK:

1. Carry Out a COSHH Risk Assessment

A COSHH risk assessment identifies:

• Hazardous substances used or produced

• How workers may be exposed

• The health risks involved

• Control measures needed

This assessment must be recorded if you employ five or more people.

2. Prevent or Control Exposure

Employers must either eliminate the hazardous substance or control exposure. This may include:

• Substituting with a safer alternative

• Using ventilation systems

• Providing suitable personal protective equipment (PPE)

• Implementing safe handling procedures

• Limiting the number of exposed employees

Control measures should follow the hierarchy of control, prioritising elimination and substitution over PPE.

3. Provide Information, Instruction and Training

Employees must understand:

• The risks associated with substances

• How to work safely

• What control measures are in place

• What to do in an emergency

Clear COSHH training is essential for compliance and accident prevention.

4. Monitor Exposure and Health

In some cases, employers must carry out health surveillance. This is common where workers are exposed to:

• Asthma-causing substances

• Skin sensitisers

• Hazardous dusts

• Biological agents

Monitoring ensures early signs of work-related illness are detected.

5. Maintain and Review Controls

Control measures must be regularly checked and maintained. COSHH assessments should also be reviewed if:

• Work processes change

• New substances are introduced

• An incident occurs

• New health risks are identified

What Is Included in a COSHH Assessment?

A thorough COSHH assessment typically includes:

• Name of the substance

• Hazard classification

• Safety Data Sheet (SDS) reference

• Routes of exposure

• Existing control measures

• Required additional controls

• Emergency procedures

Safety Data Sheets provided by suppliers are a crucial source of information when completing assessments.

What Substances Are Not Covered by COSHH?

COSHH does not cover:

• Asbestos (covered by separate regulations)

• Lead (covered by specific lead regulations)

• Radioactive substances

However, most other hazardous workplace substances fall under COSHH regulations UK.

Why COSHH Compliance Matters

Failure to comply with COSHH regulations UK can lead to:

• Employee illness or long-term health conditions

• Enforcement notices

• Unlimited fines

• Prosecution

• Reputational damage

More importantly, proper COSHH management protects workers from serious conditions such as occupational asthma, dermatitis and lung disease.

How Often Should COSHH Assessments Be Reviewed?

There is no fixed timeframe, but best practice is to review COSHH assessments:

• Annually

• When processes change

• After accidents or near misses

• When new information becomes available

Regular reviews ensure ongoing compliance with COSHH regulations UK.

Common Mistakes Businesses Make

Many organisations fall short by:

• Copying generic assessments

• Failing to update assessments

• Ignoring substances produced during work (e.g. dust)

• Relying solely on PPE

• Not providing adequate training

Effective COSHH management requires a proactive and site-specific approach.

Final Thoughts

COSHH regulations UK are fundamental to workplace safety. Any business that uses or creates hazardous substances must assess risks, implement controls, train staff and regularly review procedures.

By understanding your duties under COSHH and maintaining clear documentation, you not only stay legally compliant but also create a safer and healthier working environment for everyone.