Because of environmental civil oppinions, Ministry of Agriculture, Forestry and Fisheries in Japan, reviesed "the standards for sawn lumber" in 1994. For the possibilities of the use of preservatives out of CCA, by the using of the hazard levels, new products like ACQ, DDAC and emulsified zinc-naphthenate can be used in the standards. Since 1994, the permitable limit of the arsenic in the waste water become severe to 0.1 mg/l, but untill Fev. 1997, it's possible to allow the level of 0.3 mg/l. The Wood Preservers Association in Japan considers the possibility by accerlated fixation of CCA for decreasing the level of the arsenic in waste water of wood preservation industries.

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