Dilution: Hazardous materials

Control Measure Knowledge

This control measure should be read in conjunction with Dilution of polluting materials


In certain situations, the best way to deal with domestic quantities of spillage may be to dilute it with a large amount of water. High levels of dilution should ensure that pollutants have little impact on the environment. It is important to consider the pollutant type and quantity, and how sensitive the receiving water is before doing this.

Approval should also be sought from environmental agencies and sewerage company before diluting a spillage unless there is an immediate life risk. In such circumstances, they must be informed as soon as is reasonably practicable. See Guideline notification criteria Appendix 4: DCLG Environmental Protection Handbook for the fire and rescue service.

Strategic Actions

Tactical Actions