COSHH training: what UK employers must actually train, refresh and record

What COSHH covers, and why it matters

COSHH stands for Control of Substances Hazardous to Health. It is both the framework for managing chemical and biological risk at work, and a specific set of regulations: the Control of Substances Hazardous to Health Regulations 2002, made under the Health and Safety at Work etc. Act 1974. The regulations apply to almost every UK workplace where employees are exposed to a hazardous substance in the course of their work.

Hazardous substances include a wider set of materials than most employers assume. The HSE COSHH guidance covers chemicals and cleaning products, industrial solvents, adhesives, paints and pesticides, fumes and gases (welding fume, exhaust, refrigerant vapours), dusts (wood, silica, flour, textile), biological agents (bacteria, viruses, fungi, bloodborne pathogens) and skin sensitisers such as epoxy resins, nickel salts and latex. Asbestos, lead and radioactive substances are covered by their own dedicated regulations.

The scale of harm is significant. The HSE's work-related ill health statistics estimate that around 13,000 deaths a year in Great Britain are linked to past occupational exposure, primarily to chemicals and dust. Of those, around 11,000 are lung disease deaths. A further 22,000 new cases each year of self-reported breathing or lung problems are caused or made worse by work, and an average of 16,000 people a year report skin problems caused or made worse by their job. COSHH training is the first line of prevention against every one of those outcomes.

Is COSHH training a legal requirement?

Yes. Under Regulation 12 of the COSHH Regulations 2002, employers must provide employees who are or may be exposed to substances hazardous to health with "such information, instruction and training as is suitable and sufficient" for them to know the health risks, the precautions to take, and how to use control measures and personal protective equipment properly. This duty sits alongside the general training duty in section 2(2)(c) of the Health and Safety at Work Act 1974.

The COSHH duty is not a one-off. Regulation 12(2) requires the information, instruction and training to be updated to take account of significant changes in the work, and Regulation 12(1)(b) makes clear it must be reviewed regularly. In practice, that means initial training when someone starts a role that involves hazardous substances, refresher training when a new substance or process is introduced, and periodic refreshers to keep knowledge current. Most employers refresh every 1 to 2 years as best practice.

Failure to comply is an offence under section 33 of the Health and Safety at Work Act 1974. The HSE enforcement guide confirms that in the Crown Court, breaches of health and safety regulations carry an unlimited fine, and in serious cases, imprisonment of up to two years for senior individuals. Employers' liability insurance also typically requires evidence of COSHH risk assessments and training records; failure to hold them can invalidate cover.

The 8 core duties COSHH places on employers

The COSHH Regulations 2002 set out a structured approach to managing hazardous substances. The eight duties every employer must meet are:

1. Assess the risk (Regulation 6). A written COSHH risk assessment for every hazardous substance used, produced or released at work, identifying who is exposed, how, and to what extent.
2. Prevent or control exposure (Regulation 7). Apply the hierarchy of control: eliminate the substance, substitute a safer one, use engineering controls (ventilation, enclosure), then administrative controls (procedures, rotas), then personal protective equipment as the last line of defence.
3. Use and maintain control measures (Regulation 8). Employees must use the controls provided; employers must keep them in efficient working order.
4. Examine and test control measures (Regulation 9). Local exhaust ventilation must be thoroughly examined and tested at least every 14 months (more often for some processes), with records kept for at least 5 years.
5. Monitor exposure (Regulation 10). Where the assessment shows it is needed, or where a substance has a workplace exposure limit set out in HSE publication EH40/2005, measure actual exposure and keep the results.
6. Provide health surveillance (Regulation 11). For substances such as isocyanates, wood dust, flour dust, chrome and nickel salts, health surveillance is a legal requirement, not an option.
7. Provide information, instruction and training (Regulation 12). The training duty at the heart of this article.
8. Plan for accidents and emergencies (Regulation 13). Spill response, first aid, emergency procedures and drills.

Well-trained employees are what makes duties 3, 4, 5 and 8 work in practice. Controls that people do not understand, do not trust or cannot use correctly do not protect anyone.

What good COSHH training covers

A COSHH course that meets the Regulation 12 standard should cover the full lifecycle of a hazardous substance in the workplace, not just chemical names and pictograms. The learndirect COSHH Training course works through:

• The legal framework. COSHH 2002, HSWA 1974, employer and employee duties, and the HSE's role.
• Types of hazardous substance. Chemicals, dusts, fumes, gases, biological agents, skin sensitisers, and how they behave in real workplaces.
• Routes of exposure. Inhalation, skin absorption, ingestion, injection through cuts or sharps, and eye contact.
• Acute and long-term health effects. Burns, respiratory distress and poisoning on one hand; occupational asthma, contact dermatitis, cancer, organ damage and reproductive harm on the other.
• Reading chemical labels. The GB CLP hazard pictograms, signal words (Danger, Warning), hazard statements (H-codes) and precautionary statements (P-codes).
• Safety data sheets. The 16 mandatory sections of an SDS, what to look for in each, and where to find them on-site.
• COSHH risk assessment. Hazards, who is exposed, current controls, gaps and actions.
• The hierarchy of control. Why elimination and substitution come first, why PPE is last.
• Selecting and using PPE. Gloves matched to the chemical, respiratory protection with the correct assigned protection factor, eye protection, coveralls, and how PPE is fit-tested and maintained.
• Safe handling, storage and disposal. Segregation of incompatible substances, decanting, containment and waste routes.
• Spillage and emergency response. Alerting others, containing small spills, when to evacuate, when to call 999, and reporting.
• Record keeping. Assessments, monitoring results, training records and health surveillance records.

Who needs COSHH training?

The duty applies wherever hazardous substances are used at work, which is a much wider range of jobs than the phrase "chemical worker" suggests. Roles where COSHH training is essential include:

• Cleaning and facilities. Bleach, degreasers, floor polish, drain cleaner and disinfectants are used daily; cleaners and janitorial staff are consistently in HSE's higher-exposure groups.
• Manufacturing and metalworking. Solvents, metalworking fluids, welding fume, metal dusts and paint spray.
• Construction and demolition. Silica dust, cement, adhesives, solvents, paints and lead in older buildings. Asbestos is covered by separate asbestos awareness training.
• Healthcare and social care. Disinfectants, cytotoxic medications, bloodborne pathogens and glutaraldehyde in endoscopy suites. The HSE estimates around 1,000 nurses a year develop work-related contact dermatitis, mostly from frequent hand washing and disinfectant use.
• Hairdressing and beauty. Peroxide, ammonia, permanent hair dye, acrylate nail products, and the persistent skin and respiratory sensitiser risk that comes with them.
• Hospitality and food service. Kitchen cleaners, grease removers, oven cleaners and pest control chemicals.
• Agriculture and grounds maintenance. Pesticides, herbicides, fertilisers, veterinary medicines and grain and flour dust.
• Laboratories and technical services. Solvents, acids, alkalis, cryogenic gases and biological agents.
• Managers, supervisors and health and safety representatives. Not because they personally handle chemicals, but because Regulation 12 also requires them to understand the risks in the areas they supervise, and to ensure their teams are trained.

If your role involves any recognisable chemical smell, requires you to wear gloves for chemical rather than infection control reasons, or exposes you to visible dust or fume, COSHH training almost certainly applies.

The cost of not doing it properly

The financial and human cost of poor COSHH management is well-documented. HSE's cost of work-related ill health estimates put chemical and dust exposure among the largest contributors to the annual bill for occupational disease, running into billions of pounds a year in healthcare costs, lost output and compensation.

Individual case outcomes reinforce the point. Contact dermatitis from cleaning chemicals routinely ends careers in hairdressing, catering and healthcare. Occupational asthma from flour, isocyanates or welding fume is often irreversible once established. Silicosis from construction dust and mesothelioma from historic asbestos exposure remain among the most serious occupational diseases HSE tracks. And every one of those outcomes is preventable through a competent COSHH risk assessment, appropriate controls, and workers who have been trained well enough to recognise the risks and use the controls correctly.

When to complete or refresh COSHH training

• Before starting work with hazardous substances. Regulation 12 requires training to be in place before exposure begins, not shortly after.
• As part of induction. For any role where chemical or substance handling is a normal feature of the job.
• When new substances or processes are introduced. A new cleaning product, a new supplier's paint system or a change in an industrial process all trigger the update duty in Regulation 12(2).
• When procedures or control measures change. Including changes to PPE, ventilation or emergency response.
• Periodically. HSE does not set a fixed refresher interval, but every 1 to 2 years is the widely-adopted standard, and shorter for higher-risk work.
• After an incident. Any near-miss, spill, exposure event or ill-health case involving a hazardous substance is a trigger to review and refresh training for the affected team.

Why online COSHH training works

COSHH is knowledge-led. The learner needs to understand hazards, labels, safety data sheets, controls and PPE well enough to apply them at work. That kind of content is well suited to online delivery: the learner works through structured modules, tests understanding with scenario-based questions, and produces an audit-ready certificate on completion.

The learndirect COSHH Training course takes around 60 minutes to complete and awards 1 CPD hour on successful completion. It costs £25 (plus VAT) and delivers an instant CPD-certified digital certificate that can be added to a training matrix, uploaded to a compliance system and shown at HSE inspection. Where practical, site-specific instruction on the actual substances in use (safety data sheets, in-house procedures, spill kits) should be layered on top of the online module: the training duty is fully met when the general knowledge and the site-specific detail are both in place.

How COSHH fits alongside other health and safety training

COSHH sits within a wider set of workplace health and safety duties, and works best when the surrounding training is also in place:

• PPE training. COSHH depends on the correct selection, use and maintenance of personal protective equipment, so PPE training is a natural companion module.
• Manual handling training. Moving drums, sacks of powder, gas cylinders and waste containers safely.
• Asbestos awareness training. Asbestos is regulated separately under the Control of Asbestos Regulations 2012 but is often relevant to the same trades that handle other hazardous substances.
• First aid at work training. Chemical burns, eye splashes and inhalation incidents all need trained first-aiders on site.
• Fire warden training. Many hazardous substances are also flammable or reactive, so fire safety and COSHH controls need to work together.

Employers running a compliance training programme typically issue COSHH, PPE and manual handling together as a chemical-handling bundle, with first aid and fire warden training layered in for nominated staff.