COSHH Training: What the Law Requires and Does Online Training Count?

What Is COSHH Training?

COSHH training is the instruction, information, and guidance that employers must provide to employees who may be exposed to hazardous substances at work. It is a legal requirement under the Control of Substances Hazardous to Health Regulations 2002, specifically Regulation 12.

Without training, your COSHH assessments are incomplete — you have identified the risks and specified controls, but you have not ensured your employees understand what those controls are or why they matter. An HSE inspector will ask your staff questions, not just look at your paperwork.

What Does the Law Actually Say?

Regulation 12(1) of the COSHH Regulations states:

"Every employer who undertakes work which is liable to expose an employee to a substance hazardous to health shall provide that employee with suitable and sufficient information, instruction and training."

"Suitable and sufficient" is deliberately broad — the law does not prescribe a specific format, length, or qualification. What it requires is that training is appropriate for:

The nature and degree of exposure the employee faces
The specific hazards of the substances they handle
The control measures in place in your workplace

Regulation 12(2) sets out what information employees must receive. They must be told:

The names of the hazardous substances they work with and the health risks involved
Any Workplace Exposure Limit (WEL) that applies
The significant findings of the relevant COSHH assessment
The results of any exposure monitoring (and told promptly if the limit is exceeded)
The collective results of any health surveillance (without identifying individual workers)

Regulation 12(3) adds that training "shall be adapted to take account of significant changes in the type of work carried out or working methods used" — meaning it is not a one-off exercise.

What COSHH Training Must Cover

Regardless of format, your COSHH training must ensure employees understand:

1. The substances they work with

Name every hazardous substance they use, produce, or could be exposed to. This includes process-generated substances — a joiner training new staff must cover wood dust, not just bottled chemicals. Show them the actual products, labels, and Safety Data Sheets.

2. The specific hazards

Use plain language. "This product is a respiratory sensitiser — repeated inhalation can cause occupational asthma that may be permanent" is meaningful. A list of H-phrases without explanation is not training. Cover all relevant routes of exposure: inhalation, skin contact, eye contact, ingestion.

3. The control measures

Walk through every control in the COSHH assessment:

Ventilation — where it is, how to turn it on, why it matters
PPE — what type, where to get it, how to put it on correctly, when to replace it
Safe procedures — dilution ratios, storage rules, substances that must never be mixed
Disposal — how to dispose of waste chemicals safely

Do not just point at equipment. Demonstrate how to use it.

4. Emergency procedures

Every employee must know what to do if they:

Get a chemical on their skin or in their eyes
Breathe in fumes and feel unwell
Witness or cause a chemical spill
Encounter an unknown substance

Include first-aid locations, emergency contacts, and when to evacuate rather than respond.

5. Health surveillance (where required)

If employees are exposed to substances that trigger health surveillance requirements — respiratory sensitisers like isocyanates, flour dust, or wood dust; or substances requiring regular health checks — explain what monitoring will happen and why early reporting of symptoms matters. For a full rundown on COSHH training for new employees, see our COSHH training checklist for new starters.

Does Online COSHH Training Count?

Yes — online COSHH training certificates are legally valid, but only if the training meets the "suitable and sufficient" standard. The law does not require face-to-face delivery. What it requires is that employees actually understand the hazards and controls relevant to their work.

In practice, generic e-learning modules have a significant limitation: they are not specific to your workplace, your products, or your COSHH assessments. An online COSHH course that covers "bleach is a hazardous substance" is very different from training that covers your specific cleaning products, your ventilation setup, and your emergency procedures.

When online COSHH training is adequate:

You use it as a foundation — it covers the legal framework, the hierarchy of control, and PPE principles
You supplement it with workplace-specific instruction covering your actual products, assessments, and controls
Employees work through it before any exposure to hazardous substances

When online COSHH training is not sufficient on its own:

Employees work with high-hazard substances (carcinogens, respiratory sensitisers, Group 2-4 biological agents)
The work involves substances with tight Workplace Exposure Limits requiring practical monitoring awareness
Your workplace has complex control systems (LEV, enclosed processes) that require physical demonstration

For a cleaning operative handling diluted all-purpose cleaner, a short online module plus a supervisor walkthrough is probably enough. For a welding supervisor handling isocyanate primers in a manufacturing plant, an online module alone would not meet "suitable and sufficient."

Do COSHH Training Certificates Expire?

COSHH training certificates from commercial providers typically have an expiry date of one to three years. This is the provider's recommendation, not a statutory requirement. The law requires that training is repeated "at appropriate intervals" (Regulation 12(3)) whenever there are significant changes.

Regulation 12(3) does not set a fixed annual interval — it requires training to be adapted whenever there are significant changes. Good practice, however, is to refresh training at least annually as a prompt to catch drift; additionally, refreshers are warranted:

Whenever a new hazardous substance is introduced
When a product, supplier, or formulation changes (the hazard profile may have changed)
After an incident, near-miss, or health complaint related to chemical exposure
When a COSHH assessment is reviewed and updated

A commercial certificate with an expiry date is useful as a calendar prompt, but it does not replace the obligation to retrain after material changes — and it does not excuse you from retraining if a new substance is introduced the day after the certificate was issued.

How to Document COSHH Training

Undocumented training is unenforceable training. If an HSE inspector asks to see your COSHH training records and you cannot produce them, the inspector has no evidence that training happened.

For each training session, record:

Field	What to capture
Employee name	Full name of the trainee
Date of training	Must be before first exposure
Trainer name and role	Who delivered the training
Topics covered	Hazards, controls, PPE, emergency procedures
Substances covered	List the actual products by name
Assessments shown	Reference the COSHH assessment numbers or titles
Employee signature	Confirms they received and understood the training
Trainer signature	Confirms the training was delivered

Keep records for as long as the employee is employed, plus a reasonable period after they leave. COSHH does not specify an exact retention period, but employment tribunals and HSE investigations can go back several years.

Common COSHH Training Failures

These are the gaps that produce enforcement action and compensation claims:

Training after first exposure. "We will cover it in induction next week" is a breach of Regulation 12 if the employee handles chemicals before that induction.

Generic training not linked to actual products. An e-learning certificate that does not reference your specific substances, your actual COSHH assessments, or your control measures is insufficient as standalone training.

No record of training. Even excellent verbal training cannot be demonstrated without documentation. Inspectors and employment tribunals will not accept "we told them."

No refreshers after product changes. Staff trained on one cleaning product range but using a different one since last year have not been trained on their current products.

Training that covers bottled chemicals only. Many employers train staff on liquid products but omit process-generated substances — wood dust, flour dust, welding fume. These are COSHH substances and employees must be trained on them.

Making COSHH Training Manageable

For a small business, COSHH training does not need to be elaborate. A 20-minute walkthrough of each relevant substance, the hazards, the controls, and the emergency procedures — delivered by a supervisor who has read the COSHH assessments — satisfies the law if it is specific, timely, and recorded.

COSHHmate is being built to keep your COSHH assessments in one place, accessible to everyone on the team. Showing a new employee their relevant assessments on screen and walking through the key points becomes the training — and the assessment record becomes evidence that the training was specific and accurate.

If you want COSHH compliance that does not rely on one person knowing everything, join the waitlist to find out when COSHHmate launches.

This guide is for information only and does not constitute legal advice. COSHH obligations depend on the specific substances, quantities, and work processes in your workplace. The definitive source is the Control of Substances Hazardous to Health Regulations 2002 and the HSE's Approved Code of Practice L5.