UK COSHH Data Sheet Reference

Chlorine Dioxide Tablets (Water Sanitiser) COSHH Data Sheet UK

Q: What PPE is needed for Chlorine Dioxide Tablets (Water Sanitiser)?

The recommended PPE for Chlorine Dioxide Tablets (Water Sanitiser) typically includes: Nitrile gloves; Eye protection (splash goggles); Respiratory protection if working in enclosed water tank. Actual requirements depend on the specific workplace exposure and must be confirmed by the assessor.

Q: What are the emergency procedures for Chlorine Dioxide Tablets (Water Sanitiser) exposure?

Skin contact: Rinse with plenty of water. Seek medical attention if burns visible. Eye contact: Rinse immediately with water for at least 15 minutes. Get emergency medical attention. Inhalation: Move to fresh air immediately. Seek medical attention urgently - chlorine dioxide can cause pulmonary oedema. Ingestion: Rinse mouth. Do not induce vomiting. Get emergency medical attention. For any serious exposure, call 999 in the UK.

A HSE-format UK COSHH data sheet reference for Chlorine Dioxide Tablets (Water Sanitiser) (also known as Chlorine Dioxide, ClO2, Water Sanitiser). Covers workplace exposure limits from HSE EH40/2005, GHS hazard classification, control measures, PPE, storage, spillage and emergency procedures. Use the data here to complete your own COSHH assessment, or generate a workplace-specific PDF in 5 minutes.

Saad

Founder, coshhassessments.co.uk

@saad7038 on X·About·Updated 21 July 2026

Baseline Risk Rating

Medium-High

CAS Number: 10049-04-4

Physical Form: Tablets or granules that dissolve to release chlorine dioxide in solution

Common Names: Chlorine Dioxide, ClO2, Water Sanitiser, Milton Tablets, Legionella Treatment

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Important noteThis reference summary is compiled from HSE EH40/2005 and publicly available manufacturer Safety Data Sheets. It is not the manufacturer's official SDS for any specific product. Before relying on any COSHH assessment based on this data, cross-check against the SDS supplied with the specific product you use in your workplace. See our methodology page for how we source and verify data.

GHS Hazard Classification

Oxidiser (Ox. Sol. 2), Acute Toxicity Cat 3 (H331 gas), Skin Corrosive/Irritant (H314/H315 in solution), Serious Eye Damage (H318).

Health Effects

Used for water tank sanitisation, ice machine cleaning, and Legionella control in catering and cleaning. Gas release is dangerous in confined spaces. Solution is corrosive to skin and eyes.

Routes of Exposure

Inhalation of gas (if released)
Skin contact (solution)
Eye contact

Workplace exposure to Chlorine Dioxide Tablets (Water Sanitiser) is regulated under the Control of Substances Hazardous to Health Regulations 2002. Employers must reduce occupational exposure to as low as reasonably practicable, following the HSE hierarchy of control.

Recommended Control Measures

Applied in the HSE hierarchy of control order: eliminate, substitute, engineering, administrative, PPE.

Use in ventilated area, never in confined space without ventilation
Never mix with acid or bleach
Follow dose instructions exactly
Rinse surfaces thoroughly after contact time

Recommended PPE

Nitrile gloves
Eye protection (splash goggles)
Respiratory protection if working in enclosed water tank

Emergency Procedures

Skin contact: Rinse with plenty of water. Seek medical attention if burns visible.

Eye contact: Rinse immediately with water for at least 15 minutes. Get emergency medical attention.

Inhalation: Move to fresh air immediately. Seek medical attention urgently - chlorine dioxide can cause pulmonary oedema.

Ingestion: Rinse mouth. Do not induce vomiting. Get emergency medical attention.

UK emergency: 999. Medical advice: NHS 111. Poisons information for healthcare professionals: TOXBASE.

Data Sources

HSE Legionnaires guidance L8; manufacturer SDS; catering industry water safety guides

Frequently asked questions

Is a COSHH assessment required for Chlorine Dioxide Tablets (Water Sanitiser)?

Yes. Any UK employer whose staff work with Chlorine Dioxide Tablets (Water Sanitiser) must hold a written COSHH assessment under the Control of Substances Hazardous to Health Regulations 2002, Regulation 6. The assessment must be reviewed at least annually and immediately if circumstances change. You can generate one free (watermarked) using our tool.

What is the Workplace Exposure Limit for Chlorine Dioxide Tablets (Water Sanitiser)?

Workplace Exposure Limits (WELs) for Chlorine Dioxide Tablets (Water Sanitiser) are published by HSE in EH40/2005. Values come as an 8-hour time-weighted average (TWA) and 15-minute short-term exposure limit (STEL). Where a formal WEL has not been set for this substance, we mark the field as "Not established" and rely on hazard-based controls following the hierarchy of control.

What PPE is needed for Chlorine Dioxide Tablets (Water Sanitiser)?

The recommended PPE typically includes: Nitrile gloves; Eye protection (splash goggles); Respiratory protection if working in enclosed water tank. Actual PPE requirements depend on how Chlorine Dioxide Tablets (Water Sanitiser) is used in your specific workplace, how often, and existing engineering controls. Your COSHH assessment should specify PPE only after engineering and administrative controls have been considered.

Do I need health surveillance for workers using Chlorine Dioxide Tablets (Water Sanitiser)?

Health surveillance under COSHH 2002 Regulation 10 is required for substances that are respiratory sensitisers, skin sensitisers, or carcinogens where exposure is significant. If Chlorine Dioxide Tablets (Water Sanitiser) appears on the HSE health surveillance list for your industry, workers with regular exposure should have baseline and annual monitoring.

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