COSHH stands for Control of Substances Hazardous to Health. It is a set of UK health and safety regulations designed to protect workers from the harmful effects of hazardous substances in the workplace. The law requires employers to prevent or adequately control exposure to chemicals, fumes, dusts, vapours, mists, gases, and biological agents such as bacteria and viruses.
Under COSHH, businesses have a legal duty to assess risks, implement control measures, and provide training to employees. Breaches can result in unlimited fines and even imprisonment, making compliance essential for any workplace where hazardous substances are present.
What Does COSHH Stand For? The Simple Acronym and Legal Meaning
The acronym COSHH is used across UK workplaces to refer to the legal framework for managing substances that can harm health. Its full name – Control of Substances Hazardous to Health – reflects both its purpose and its scope.
| Element | Details |
|---|---|
| Acronym | Control of Substances Hazardous to Health |
| Purpose | Protect workers from health risks caused by hazardous substances |
| Legal Status | UK statutory instrument (SI 2002/2677 as amended) |
| Scope | All workplaces where hazardous substances are present (chemicals, fumes, dusts, biological agents) |
Key Insights
- COSHH is a UK-specific regulation; other regions have equivalents like OSHA HazCom in the USA.
- The “3 main regulations” often refer to the COSHH Regulations 2002, the requirement to assess risks, and the hierarchy of control measures.
- No single mandatory qualification for COSHH risk assessors exists; competence is defined by knowledge, training, and experience.
- Employers must document risk assessments if they have five or more employees, but all are legally required to perform them.
- COSHH covers more than just chemicals – it includes any substance that can harm health, such as biological agents, dusts, and gases.
- Training under COSHH is a legal duty for all employees exposed to hazardous substances.
Snapshot Facts
| Fact | Detail |
|---|---|
| Year introduced | 1988 (revised 2002, 2004, 2020) |
| Enforcing authority | Health and Safety Executive (HSE) / local authorities |
| Number of main requirements | 8 key steps (often summarised as 5 steps of risk assessment) |
| Penalties for non-compliance | Unlimited fines, imprisonment up to 2 years |
| Exemptions | Asbestos, lead, radioactive substances (covered by other regulations) |
| Geographical scope | Great Britain (2002 Regulations); Northern Ireland (2003 Regulations) |
What Are the Main Regulations of COSHH and How Many Requirements Do Employers Face?
The Three Core Regulations of COSHH
When people refer to the “3 main regulations” of COSHH, they typically mean the overarching COSHH Regulations 2002 (SI 2002/2677), the legal duty to carry out a risk assessment, and the requirement to apply a hierarchy of control measures. The regulations themselves contain several parts, but these three form the backbone of compliance.
Key Employer Requirements Under COSHH
Employers must assess and manage the risk from hazardous substances. The core duties include:
- Carry out COSHH risk assessments to identify hazardous substances and evaluate exposure risks.
- Prevent exposure where possible, or otherwise control exposure to a level that is as low as reasonably practicable.
- Put control measures in place and keep them effective, maintained, and in good working order.
- Provide information, instruction, and training to employees about the hazards and the controls.
- Plan for accidents and emergencies involving hazardous substances.
- Monitor exposure and carry out health surveillance where appropriate.
- Supervise workers to make sure controls are used correctly.
What Does COSHH Cover? Substances, Hazards and Activities
COSHH applies to a broad range of substances and materials, including liquids, solids, fumes, dusts, vapours, fibres, nano-particles, mists, gases, and biological agents. According to the Health and Safety Executive for Northern Ireland, it is not limited to substances with a hazard label; health hazards can also arise from work processes that create exposure. Common examples include chemicals, cleaning products, paints, fumes, dusts, laboratory materials, and biological agents.
COSHH requires a hierarchy of control measures: elimination and substitution are preferred over engineering controls and personal protective equipment. PPE is considered the last line of defence, not the first.
Who Needs COSHH Training and What Qualifications Are Required for Risk Assessments?
COSHH Risk Assessment: Competence vs. Formal Qualifications
No specific certificate is mandated by law to perform a COSHH risk assessment. The HSE expects the person carrying out the assessment to be “competent” – defined by their knowledge, training, and experience. Many employers choose accredited courses such as NEBOSH or IOSH to demonstrate competence, but the law does not prescribe a single qualification.
COSHH Training Requirements for Employers and Employees
Training is a specific employer duty under COSHH. Workers must be given information, instruction, and training so they understand the hazards, the safe working methods, and how to use control measures correctly. In practice, COSHH training commonly covers:
- What the substance is
- Health effects and warning signs
- Safe handling and storage
- Use of PPE and control equipment
- Spill, accident, and emergency procedures
- Where to find safety information and assessments
COSHH training is not a one-off event. It must be refreshed whenever work activities change, new hazardous substances are introduced, or after an incident that reveals a gap in knowledge.
When Was COSHH Introduced and How Has It Evolved Over Time?
The COSHH regulations have developed significantly since first being enacted. The following timeline highlights the key milestones.
- – First COSHH Regulations introduced (SI 1988/1657)
- – Amendments to extend to biological agents
- – Current COSHH Regulations consolidated (SI 2002/2677)
- – Minor amendments on symbols and definitions
- – Updated after Brexit; retained as UK law
- – Ongoing guidance updates by HSE
What Is Certain and What Remains Unclear About COSHH Requirements?
| Topic | Certainty |
|---|---|
| What COSHH stands for | High – universally agreed: Control of Substances Hazardous to Health. |
| Qualifications for risk assessment | Medium – no mandatory certificate; competent person defined by employer; industry-recognised courses exist but not legally required. |
| Whether COSHH applies to all substances | High – covers any substance that can harm health, but specific exclusions (asbestos, lead, radiation) apply. |
| Number of employer requirements | Medium – the 8-step approach is a widely used framework; the legal text has a different structure, but HSE promotes 8 steps. |
How Does COSHH Fit Into UK Health and Safety Legislation?
COSHH works alongside other UK regulations such as DSEAR (Dangerous Substances and Explosive Atmospheres Regulations), REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals), and RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations). While DSEAR focuses on fire and explosion risks, COSHH addresses health hazards from exposure. REACH governs the supply and use of chemicals, and RIDDOR requires reporting of work-related ill health.
A common misconception is that COSHH only applies to chemicals in labelled containers. In reality, it covers any process that creates dust, fumes, or biological exposure – from woodworking to healthcare waste handling. Since its introduction, COSHH has contributed to a reduction in occupational diseases, though the HSE continues to update guidance to reflect new substance classifications and post-Brexit regulatory adjustments.
Many believe COSHH only applies to chemicals in labelled containers. In reality, it covers any process that creates dust, fumes, or biological exposure – from woodworking to healthcare waste handling.
What Are the Official Sources for COSHH Information?
The following quotes from authoritative bodies summarise the core of COSHH.
“COSHH is the law that requires employers to control substances that are hazardous to health.”
— HSE COSHH page
“COSHH stands for ‘Control of Substances Hazardous to Health’ and is a set of regulations put in place to protect workers from ill health.”
“COSHH is a key piece of UK legislation that requires employers, by law, to protect their employees from hazardous substances.”
— Skills for Health
What Should You Do Next to Ensure COSHH Compliance?
For employers, the first step is to conduct a COSHH risk assessment using HSE’s free templates. Employees should request COSHH training from their employer and know their rights. For learners, enrolling in an accredited course (e.g., IOSH, NEBOSH, or CITB) can build competence. Stay updated with HSE’s regulatory changes and new substance classifications.
For more on UK regulatory acronyms, see What Does ASMR Stand For – Complete Definition and Meaning.
Frequently Asked Questions About COSHH
How many requirements does COSHH place on the employer?
The HSE outlines 8 key steps: (1) identify hazards, (2) decide who might be harmed, (3) evaluate risks, (4) record findings, (5) implement controls, (6) monitor exposure, (7) provide information/training, (8) review regularly.
What does COSHH cover?
COSHH covers substances that can harm health, including chemicals, fumes, dusts, vapours, mists, gases, biological agents, and nanomaterials. It excludes asbestos, lead, and radioactive substances (covered by other regulations).
Are COSHH regulations the same across the UK?
Yes, the COSHH Regulations 2002 apply to England, Scotland, Wales, and Northern Ireland (with minor variations in Northern Ireland’s equivalent SI).
Do I need a certificate to do a COSHH risk assessment?
No specific certificate is required by law, but you must be competent. Many choose accredited training (e.g., NEBOSH, IOSH) to demonstrate competence.
Is COSHH only for chemical substances?
No, it covers any substance hazardous to health, including biological agents (e.g., viruses, bacteria), dusts, and even some physical agents like noise (though noise is regulated separately).
What are the penalties for not complying with COSHH?
Non-compliance can lead to unlimited fines and imprisonment of up to two years, depending on the severity of the breach.
Who enforces COSHH?
The Health and Safety Executive (HSE) and local authorities enforce COSHH across different workplace settings.
Does COSHH apply to self-employed people?
Yes, self-employed individuals working with hazardous substances are also covered by COSHH regulations.
What is a Workplace Exposure Limit (WEL)?
A WEL is the maximum concentration of a substance that workers can be exposed to over a specific period, as set under COSHH.
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Oscar Brooks covers local business, housing, jobs and property across Hampshire.