ISO/TR 26368:2012 — Environmental Damage Limitation from Fire-Fighting Water Runoff

1. The Environmental Challenge of Fire-Fighting Water Runoff

ISO/TR 26368:2012 addresses a critical but often overlooked aspect of fire safety engineering: the environmental damage caused by fire-fighting water runoff. When large volumes of water are applied to extinguish fires, the runoff collects a complex mixture of combustion products, unburned fuels, firefighting foam concentrates, and debris. This contaminated water must be managed to prevent pollution of soil, groundwater, surface waterways, and municipal drainage systems.

The scale of the problem is immense. A typical industrial fire may require thousands of cubic meters of water over several hours or days of firefighting. At the Buncefield oil storage depot fire in the United Kingdom (2005), approximately 30 million liters of fire-fighting water runoff contaminated with petroleum products and firefighting foam required containment and treatment. Similarly, the Sandoz chemical warehouse fire in Switzerland (1986) released pesticide-contaminated firefighting water into the Rhine River, causing massive ecological damage across multiple European countries.

2. Containment Strategies and Best Practices

ISO/TR 26368 provides a comprehensive framework for containing and managing fire-fighting water runoff, organized around the principles of prevention, containment, treatment, and disposal. The most effective strategy is to prevent contaminated water from entering the environment at the point of generation.

Source control measures include permanent firewater containment structures such as dikes, curbing, and retention basins incorporated into the design of facilities handling hazardous materials. These structures must be sized to hold the expected firewater volume, typically calculated as the firewater flow rate multiplied by the expected fire duration, plus a safety margin for foam solutions and rainwater.

Temporary containment measures are needed for facilities without permanent systems or for incidents exceeding permanent capacity. These include rapidly deployable barriers (inflatable dams, portable spill booms), excavation of temporary retention ponds, and diversion to lined lagoons or holding tanks. The selection of temporary measures depends on site topography, soil permeability, available response time, and the volume of water expected. Pre-positioning of containment equipment at strategic locations around the facility can significantly reduce deployment time during an incident.

Foam management is a particular challenge because AFFF containing fluorosurfactants is highly persistent and can contaminate groundwater at parts per trillion levels. ISO/TR 26368 addresses the need to contain foam-laden runoff separately and consider fluorine-free alternatives where feasible.

3. Integrating Environmental Protection into Emergency Planning

The most important contribution of ISO/TR 26368 is its emphasis on proactive planning rather than reactive response. Environmental protection must be integrated into emergency response plans from the beginning.

Pre-incident planning requires facilities to conduct environmental risk assessments that identify sensitive receptors (waterways, groundwater aquifers, protected ecosystems) in the surrounding area. The risk assessment should evaluate potential contaminant release scenarios and establish trigger points for escalating protection measures.

Incident command integration requires environmental considerations in the incident command structure. ISO/TR 26368 recommends designating an environmental monitoring officer within the incident management team to monitor runoff containment, coordinate with environmental agencies, assess downstream impacts, and advise on tactical decisions.

Post-incident remediation planning should begin during firefighting. Samples of contained runoff should be collected for analysis as soon as possible to characterize contaminants and determine appropriate treatment methods. The report provides guidance on sampling protocols, analytical parameters, and treatment options including on-site treatment, off-site disposal at permitted facilities, and monitored natural attenuation for low-risk scenarios. A clear chain of custody for samples and proper documentation of containment measures is essential for regulatory compliance and potential liability defense.

Regulatory compliance is woven throughout the report. Many jurisdictions require facilities to have firewater containment plans as part of environmental permits. These plans must demonstrate that the facility can contain the calculated firewater volume for the worst-case fire scenario and that the contained water can be properly managed and disposed of. Failure to contain runoff can result in significant fines, cleanup costs, and liability for natural resource damage. The report emphasizes that regular testing and maintenance of containment systems is equally important as their initial design, as blocked drains, corroded valves, or compromised dikes can render even well-designed systems ineffective when most needed.

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