Previously TCP has been used as as a degreaser, paint remover, and cleaning agent. Currently TCP is utilized as a chemical intermediate in the manufacture of various organic chemicals. The result of these uses is occurrence at Superfund sites in Southern California since the late 1990s. In the Great Central Valley of California much of the occurrences are a result of TCP being an impurity in a soil fumigant used to control nematodes. This occurrence is mainly in the Merced, Kern, and Fresno counties as a result of land application in agricultural areas.