Production and storage facilities handling dangerous chemicals and explosives must be placed in locations where they cannot pose a risk of damage to human health, the environment or property in their vicinity. Correspondingly, when the areas surrounding these facilities are planned or built, it is important to ensure that the risk caused by them is sufficiently taken into consideration.
A basic requirement for the siting of a new production plant is that the planning in the area permits it. The area must be reserved for industrial and storage operations, in which case its plan symbol is “T”, for example. The plan symbol T/Kem is recommended for sites that pose a major accident risk (an industrial or storage building area where a major plant that manufactures or stores dangerous chemicals can be located). Without specifically justified grounds, a production plant (facility handling or storing dangerous chemicals or gases) may not be located on a major groundwater area or other groundwater area suitable for water supply.
When production plants are sited, the impacts of possible accidents in the production plant to the plant's surroundings and the development of these accidents with regard to time must be taken into consideration. Siting of the plant is reviewed from the point of view of the accident risk caused by chemicals (thermal radiation, pressure shock, health impacts, environmental impacts). The siting must especially take into consideration vulnerable areas surrounding the establishment (e.g. residential areas, schools, hospitals, care facilities, day care centres), that might be in danger as a result of an accident, and sites that may cause a further risk to the operations of the production plant (e.g. other industrial facilities). The chemical safety statutes require co-operation among establishments located close to each other in the prevention of accidents.