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Water / Soil / Ground Environment

Environmental Quality Standards for
Soil Pollution

Environmental Quality Standards (EQS) for soil pollution were issued in August 1991. As a result of additions made in February 1994, the EQS now regulate 25 substances. Guidelines for Investigation and Countermeasures for Soil and Groundwater Pollution were established in November 1994, to ensure smooth implementation of surveys and countermeasures based on the EQS and Evaluation Standards Relevant to Soil and Groundwater. Administrative guidance is provided to polluters to urge them to clean up polluted soil voluntarily under these guidelines.

Environmental Quality Standards for Soil Pollution

SubstanceTarget level of soil quality examined through leaching 
and content tests
cadmium0.01 mg/l in sample solution and less than 0.4mg/kg in rice for agricultural land
total cyanidenot detectable in sample solution
organic phosphorusnot detectable in sample solution
lead0.01 mg/l or less in sample solution
chromium (VI)0.05 mg/l or less in sample solution
arsenic0.01 mg/l or less in sample solution, and less than 15 mg/kg in soil for agricultural land (paddy fields only)
total mercury0.0005 mg/l or less in sample solution
alkyl mercurynot detectable in sample solution
PCBsnot detectable in sample solution
copperless than 125 mg/kg in soil for agricultural land (paddy fields only)
dichloromethane0.02 mg/l or less in sample solution
carbon tetrachloride0.002 mg/l or less in sample solution
1,2-dichloroethane0.004 mg/l or less in sample solution
1,1-dichloroethylene0.02 mg/l or less in sample solution
cis-1,2-dichloroethylene0.04 mg/l or less in sample solution
1,1,1-trichloroethane1 mg/l or less in sample solution
1,1,2-trichloroethane0.006 mg/l or less in sample solution
trichloroethylene0.03 mg/l or less in sample solution
tetrachloroethylene0.01 mg/l or less in sample solution
1,3-dichloropropene0.002 mg/l or less in sample solution
thiuram0.006 mg/l or less in sample solution
simazine0.003 mg/l or less in sample solution
thiobencarb0.02 mg/l or less in sample solution
benzene0.01 mg/l or less in sample solution
selenium0.01 mg/l or less in sample solution
The above standards are not applicable to:
1) Places where natural toxic substances exist such as near mineral veins, and
2) Places designated for storage of toxic materials such as waste disposal sites.

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