COSHH compliance: questions and solutions for spill control

COSHH (Control of Substances Hazardous to Health) is a key UK requirement for managing hazardous substances and protecting people from exposure. In day-to-day operations, COSHH compliance is closely tied to spill control because leaks and spills can create immediate inhalation, skin contact, slip, fire and environmental risks. This page answers common COSHH questions with practical spill management solutions for industrial sites, plant rooms and utilities, including cooling water systems where treatment chemicals are stored and dosed.

Question: What does COSHH compliance mean for spill management?

Solution: Treat spill prevention and spill response as core controls within your COSHH risk assessment. COSHH expects you to identify hazardous substances, assess the risk of exposure, and implement controls so exposure is prevented or adequately controlled. In spill control terms, this normally includes:

Preventing releases with bunding, drip trays and safe storage layouts.
Containing spills quickly using spill kits, absorbents and drain protection.
Cleaning up safely with the right absorbent type and disposal method.
Training and procedures so staff know what to do and when to escalate.
Inspection and maintenance of containers, dosing equipment, pipework and control measures.

In practice, COSHH compliance is improved when you can demonstrate you have matched the hazards (for example corrosive, toxic, oxidising, flammable) to the correct spill control equipment and written response steps.

Question: Which substances trigger COSHH duties on industrial sites?

Solution: Many everyday industrial chemicals fall under COSHH, including cleaning chemicals, oils, solvents, acids and alkalis, coolants, paints, and water treatment products. A common high-risk area is water treatment and cooling systems where biocides, anti-scalants, corrosion inhibitors and pH adjusters may be stored, transferred and dosed. These can be harmful by skin contact or inhalation, and some can react with other chemicals if mixed.

Use Safety Data Sheets (SDS) to confirm hazards and response guidance. COSHH risk assessments should reflect real tasks such as delivery, decanting, drum changeovers, IBC handling, and dosing pump maintenance.

Question: How do I choose the right spill kit for COSHH compliance?

Solution: Select spill kits based on chemical compatibility, expected spill volume, and where the spill could travel (especially drains and door thresholds). Common choices include:

Chemical spill kits for acids, alkalis and aggressive water treatment chemicals. These are typically used in plant rooms, chemical stores, dosing skids and near delivery points.
Oil and fuel spill kits for hydrocarbons where water is present, such as workshop areas, generator compounds and mobile plant.
General purpose spill kits for non-aggressive liquids like coolants and water-based products (confirm against SDS).

Match kit capacity to credible worst-case spills. For example, if you routinely handle 25L drums, ensure the spill kit absorbent capacity comfortably covers a full container spill plus overspray and cleanup waste. Consider multiple smaller kits positioned at points of use rather than one remote kit that delays response.

For product selection and categories, see Spill Kits and Spill Absorbents.

Question: What role does bunding play in COSHH compliance?

Solution: Bunding is a primary control for preventing hazardous liquids from spreading and creating exposure or entering drains. Use bunded storage for drums and IBCs, bunded pallets for chemical stores, and bunded drip trays beneath dosing pumps, transfer points and valves.

For COSHH, bunding helps you demonstrate you have engineered controls in place, not only reliance on PPE and cleanup. It also supports environmental protection duties that often sit alongside COSHH at site level.

Explore options for Bunded Pallets, Drip Trays and Spill Containment.

Question: How do I stop spills entering drains and causing a secondary incident?

Solution: Drain protection should be planned in advance, not improvised mid-incident. If liquids reach surface water drains, you can escalate a workplace exposure incident into an environmental incident. Use:

Drain covers or drain mats positioned near external drains in yards and loading areas.
Drain blockers for rapid sealing when a spill occurs.
Spill socks and absorbent booms to divert or dam spills and protect thresholds and drains.

Keep drain protection equipment close to delivery points and chemical handling areas. In COSHH terms, this reduces the spread of hazardous substances and limits the area where people can be exposed.

See Drain Protection for common options.

Question: What is a practical COSHH spill response procedure?

Solution: Your procedure should be simple, rehearsed and matched to the hazards on site. A practical approach for spill control that supports COSHH compliance is:

Stop the source if safe to do so (upright the container, isolate a pump, close a valve).
Assess the hazard using labels and SDS (corrosive, toxic, flammable, oxidiser).
Protect people keep non-essential staff away, ventilate if appropriate, use correct PPE.
Protect drains deploy drain covers or blockers first where there is a risk of run-off.
Contain the spill with socks/booms to stop spread.
Absorb and collect using the correct absorbents for the substance.
Decontaminate the area where required and manage residues safely.
Dispose legally bag and label contaminated waste, store securely and follow your waste contractor guidance.
Report and review record the incident, investigate causes and update COSHH controls.

Where strong acids, alkalis or reactive chemicals are present, include escalation steps (for example, isolate the area and contact a competent responder). Always follow site rules and SDS guidance.

Question: How does COSHH apply to cooling tower and water treatment areas?

Solution: Cooling tower and water treatment operations often involve regular chemical deliveries, drum and IBC changeovers, and dosing equipment that can drip or leak. This creates recurring exposure opportunities which COSHH is designed to control. Practical measures include:

Bunded chemical storage for oxidising or corrosive dosing products.
Drip trays under dosing pumps, calibration columns and connection points.
Clearly labelled chemical spill kits positioned at the dosing skid and at delivery points.
Routine inspection of hoses, pumps, non-return valves, and fittings.
Drain protection for external plant areas and washdown points.

This reduces the likelihood of chemical contact injuries and helps prevent contaminated run-off. For operational context and examples, see Serpro guidance on cooling tower spill control.

Question: What evidence supports COSHH compliance during audits?

Solution: Audits typically look for a clear link between hazards, controls and real working practice. Useful evidence includes:

Up-to-date COSHH assessments for each hazardous substance and task.
Current SDS available at point of use.
Training records for spill response and PPE selection.
Spill kit location plans and inspection checklists (stock levels, condition, expiry where applicable).
Maintenance and inspection records for bunds, pallets, drip trays and dosing equipment.
Incident and near-miss reports with corrective actions.

Where you provide spill control measures, ensure signage and responsibilities are clear. COSHH compliance improves when supervisors can demonstrate that spill response steps are understood and routinely followed.

Question: Which official guidance should I reference for COSHH and chemical safety?

Solution: Base your procedures and assessments on recognised UK guidance, then tailor it to site-specific operations and substances. Key sources include:

HSE COSHH overview and assessment guidance: https://www.hse.gov.uk/coshh/
HSE COSHH essentials (control approach and task-based advice): https://www.hse.gov.uk/coshh/essentials/
UK REACH and chemical safety information (substance controls and SDS context): https://www.hse.gov.uk/reach/

Always align spill control actions to your SDS and site rules. If there is a conflict, follow the more stringent requirement and seek competent advice.

Next steps: build a COSHH-ready spill control setup

If you are upgrading your COSHH controls, focus on the highest-risk points first: chemical storage, transfer and dosing areas, delivery locations, and any place a spill can reach a drain. Then standardise your spill kits, bunding and drain protection so staff can respond consistently.

Relevant categories include spill kits, absorbents, drip trays, bunded pallets and drain protection.