Firewater (fire fighting)

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Firewater refers to water that has been used in firefighting and requires disposal. In many cases it is a highly polluting material and requires special care in its disposal.[1]


In many fire fighting situations, large quantities of water remain after the fire has been extinguished. This firewater contains materials present in the building and also contains dissolved and particulate materials from combustion processes and materials generated through quenching.

Fire water can be particularly polluting when the building or site being extinguished itself contains potentially polluting materials such as pesticides, organic and inorganic chemical reagents, fertilizers, etc. Certain types of premises including farms and the chemical industry pose special risks because of the types of materials present. Premises containing quantities of plastics can also cause severe problems because of the taste and odor imparted to the fire water.

Releasing contaminated fire water into a river or other water source subsequently used to supply drinking water may render the untreated water supply unsuitable for drinking or food preparation. Managing fire water frequently requires that the water be contained on site and then removed from site for specialised treatment. One of the recognised techniques is to contain the fire water in the drainage system using pneumatic bladders or lockable non-return valves which can be activated either automatically or manually.


Firewater containment is the process of containing (fire water) the run-off from fighting fires. Firewater contains many hazardous substances which are the by-products of combustion which turns normally safe materials into toxic, polluting and environmentally damaging substances. The preferred method of firewater containment is to use pneumatic bladders / drain stoppers that block the outflow from the drain or pneumatic non-return valves both of which can convert the drains into containment vessels (called sumps) from which the firewater can be pumped away into tankers for safe disposal.

Fire water containment is one of the many environmental factors that is considered alongside spill and pollution containment as an essential part of any company's environmental policy for ISO14001 accreditation.