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Chlorinated Solvents has been widely used in industries with degreased work tasks. It became popular in the beginning of the 19^th century when the industry was developing fast. The most popular chlorinated solvent has been trichloroethylene (TRI). Because of the common use of the agent, soil and groundwater contamination with TRI has been one of the most occurred contaminations around industrial sites. TRI has some special abilities that make it a difficult contamination compound. It is hard to imagine its distribution pathways and it is a carcinogenic compound with many other hazardous properties. Because of its abilities the environmental and health department of Vasteras wanted to have a compilation over the companies in Vasteras that have been using TRI and that is the subject of this study. This compilation was based on a so called TRI list that had been assembled by the county  administration of Varmland who had get facts from the Swedish producer of TRI Uddeholm AB. This list tells some of the costumers that Uddeholm AB have had through the years. Additionally to this list this study was based on a initial inventory made by the county administration of Vastmanland. The study was made through an archive investigation at the environmental and health department in Vasteras. The investigation showed that most of the companies that had used TRI were known by the environmental, health and safety management. The companies have gone through an environmental investigation and therefore the TRI use was known. There were a few company properties that had a confirmed TRI contamination. This had been confirmed by soil samples that had been taken and analysed. There were some companies that had used TRI according to the TRI list but the information about the company was too thin to find the location of the company. The result of this study shows that there are many properties that have had a company with TRI use during the 1900^th century. This study will help the future environmental work at these properties if there is a change in a property use for example.