HSE Laboratory Safety Guidance for Chemical Spill Control

Working with chemicals in laboratories demands strict control of spills, leaks and contamination. This page explains HSE-aligned laboratory safety guidance in a practical question-and-solution format, with a focus on spill control, spill kits, drip trays, bunding, drain protection and environmental compliance for UK labs.

For additional background on lab spill response and selecting the right products, see our guide: Spill Control in Laboratories.

Question: What does HSE expect from a laboratory spill control approach?

Solution: HSE expects laboratories to reduce risk so far as is reasonably practicable by planning for foreseeable spills, controlling exposure, and preventing pollution. In practice, this means you should:

• Carry out a suitable and sufficient risk assessment covering chemical spills, biological spills (where applicable), and housekeeping failures (leaking bottles, failed tubing, overfilled waste containers).
• Provide appropriate spill kits located near risk points, matched to chemical types and volumes.
• Train staff in safe response, including when to escalate and evacuate.
• Prevent releases to drains and the environment using drain protection and good storage/bunding.
• Maintain emergency arrangements and review after incidents.

Key references include the HSE health and safety management framework (Plan-Do-Check-Act) and COSHH principles for controlling exposure to hazardous substances.

Citations: HSE - Managing for health and safety; HSE - COSHH.

Question: Which laboratory areas should be prioritised for spill prevention?

Solution: Focus first on locations where spills are more likely and where consequences are higher:

• Goods-in and chemical storage rooms: handling, decanting and incompatible storage are common causes of spills.
• Wet chemistry benches and fume cupboards: routine dispensing, reactions and transfers increase small-to-medium spill probability.
• Solvent stores and flammable cabinets: flammability and vapour risks mean you need fast containment and safe clean-up methods.
• Waste accumulation points: poor labelling, incompatible mixing, or overfilling containers can create sudden leaks.
• Areas near drains: sinks, floor drains and service ducts can turn a minor spill into a pollution incident.

A practical site example is a teaching lab with multiple benches: placing spill kits only in the prep room often fails, because the spill occurs at the bench. A better solution is a bench-level kit for minor spills and a larger corridor or prep-room kit for escalation.

Question: What is the right spill kit for a laboratory?

Solution: Choose spill kits by chemical compatibility, absorbency capacity and deployment speed. Most UK labs use a combination of:

• Chemical spill kits for acids, alkalis and general laboratory chemicals.
• Oil and fuel spill kits where workshop activity, pumps or generators are present (common on R&D sites).
• General purpose spill kits for water-based liquids and non-aggressive fluids.

Make sure the kit contains PPE, disposal bags and clear instructions. If your lab handles strong acids/alkalis or oxidisers, treat selection as a technical decision: confirm absorbent suitability and whether neutralisers are appropriate for your procedures.

Internal links: Spill Kits

Question: How should a laboratory respond to a chemical spill safely?

Solution: Apply a simple, trained sequence that reduces harm and prevents escalation:

1. Stop and assess: identify the substance (label/SDS), approximate quantity, and immediate hazards (vapour, ignition sources, reactivity).
2. Protect people: restrict access, ventilate if safe to do so, and use suitable PPE. Do not improvise if the spill is beyond competence or control.
3. Control the source: uprighting a container or closing a valve can reduce volume if safe.
4. Contain: use absorbent socks/booms to stop spread, with extra focus on doorways and routes to drains.
5. Absorb and collect: apply compatible absorbents, then collect residues into suitable waste bags/containers.
6. Decontaminate: clean the surface in line with your procedure and SDS advice; avoid creating secondary hazards.
7. Dispose and record: dispose of contaminated absorbents as hazardous waste where applicable and record the incident for review.

This aligns with HSE expectations for planned emergency arrangements and COSHH control measures, supported by training and supervision.

Citations: HSE - COSHH; HSE - Successful health and safety management (HSG65 replacement guidance).

Question: How do we prevent spills entering drains in a laboratory?

Solution: Drain protection should be planned before an incident happens. Practical measures include:

• Drain covers and drain protection products positioned near floor drains where liquid could migrate quickly.
• Spill berms or temporary bunding at thresholds where liquids can escape a room.
• Good housekeeping and sealed transport containers for moving chemicals between rooms.

Where your lab connects to surface water drainage, pollution risk is often higher. Blocking a drain early can be the difference between a contained spill and a reportable environmental incident.

Internal links: Drain Covers

Citations: UK Government - Prevent pollution to surface water and groundwater.

Question: Do drip trays and bunding really matter for laboratory compliance?

Solution: Yes. Drip trays and bunding reduce the likelihood of a spill reaching walkways, electrics, drains or stored incompatibles. They also demonstrate proactive control of foreseeable leaks from bottles, carboys, pumps and waste containers.

• Use drip trays under small containers, dosing points and bench reagent bottles where minor drips are expected.
• Use bunded spill pallets or bunded shelves in stores for larger containers and repeated handling.
• Segregate incompatible chemicals with physical separation and dedicated containment where required by your risk assessment.

For many labs, the most common spill is not a dramatic accident but a slow leak that is noticed late. Secondary containment is the simple control that limits the consequences.

Internal links: Drip Trays; Bunded Spill Pallets

Question: What training and documentation should a lab have for spill incidents?

Solution: A robust laboratory spill control programme includes:

• Spill response training tailored to lab activities (bench work, stores, waste handling, out-of-hours work).
• Easy access to SDS information so staff can confirm hazards quickly.
• Clear escalation rules (when to isolate, when to call facilities/security, when to evacuate, when to contact emergency services).
• Inspection and restocking checks so spill kits, PPE and drain covers are ready for use.
• Incident reporting and review to prevent recurrence (root cause and corrective actions).

Citations: HSE - Managing for health and safety.

Question: When is a spill too dangerous for lab staff to clean up?

Solution: Do not attempt clean-up if any of the following apply:

• The substance is unknown, or the label/SDS is not available.
• There is a fire, strong fumes, suspected toxic vapour exposure, or oxygen displacement risk.
• The chemical is reactive (for example, violent reaction with water, oxidising agents, or incompatibles present).
• The volume exceeds the capacity of your spill kit and trained personnel.
• There is a risk to drains, the public, or areas outside the lab.

Set a written threshold in your lab procedure so people are not forced into on-the-spot judgement under stress. Escalation is also a compliance strength: it demonstrates control, supervision and safe decision-making.

Question: How do we choose where to locate spill kits in a laboratory?

Solution: Place spill response equipment where it is needed within seconds, not minutes. Typical lab placements include:

• At lab entrances (rapid access without moving through a contaminated area).
• Near chemical stores and decanting points.
• Adjacent to waste storage and collection points.
• Near known drain locations, with a dedicated drain cover close by.

As a rule of thumb, staff should not have to walk through a spill to reach the spill kit. Use signage and standardised kit contents so users are not searching for the right item during an incident.

Question: How can we evidence continuous improvement after a lab spill?

Solution: Close the loop with practical corrective actions:

• Update risk assessments and procedures based on actual causes (container choice, storage layout, transfer method, training gaps).
• Adjust product selection (for example, add chemical absorbent pads, more socks, or dedicated drain protection).
• Introduce small engineering controls such as drip trays under dosing points or bunded storage in cupboards.
• Schedule periodic spill drills for common scenarios (bench solvent spill, acid spill near sink, waste leak in store).

This approach supports HSE expectations for monitoring and review, and helps maintain safe, compliant operations.

Find the right spill control equipment for laboratories

If you are updating your lab spill control plan, start with the core items: chemical spill kits, drip trays, bunding and drain protection. The right selection depends on the chemicals used, typical volumes, drain proximity, and staff competence.

• Spill Kits for laboratories
• Drip trays for benches and stores
• Bunded spill pallets and secondary containment
• Drain covers and drain protection

Note: This information supports good practice but does not replace your site-specific risk assessment and local rules. Always follow your SDS and internal procedures.