I would like to know the standards of laws and ordinances regarding soil contamination.

There are soil content standards or soil elution standards for specific hazardous substances. If the excess of the standard is reported to Yokohama City by a survey of soil contamination based on laws or ordinances, it will be designated as an area.
<Type of reference value>
・Soil content standard: Values determined from the viewpoint of health effects of direct intake of contaminated soil
・Soil elution standard: Values determined from the viewpoint of health effects of ingestion via groundwater

Specific Hazardous Substances and Designated Criteria

Designation criteria
Specific hazardous substances	Soil content standards （㎎/㎏）	Standard for Soil Elution （㎎/ℓ）	Second elute volume standard （㎎/ℓ）	Groundwater standards （㎎/ℓ）	Remarks
Chloroethylene	No, no	0.002 or less	0.02 or less	0.002 or less	Added on April 1, 2017
Carbon tetrachloride	No, no	0.002 or less	0.02 or less	0.002 or less	There are specific hazardous substances in decomposed products
1,2-dichloroethane	No, no	0.004 or less	0.04 or less	0.004 or less	No, no
1,1-dichloroethylene	No, no	0.1 or less	1 or less	0.1 or less	・There are specific hazardous substances in decomposed products ・Changed the standard value on August 1, 2014
1,2-dichloroethylene	No, no	0.04 or less	0.4 or less	0.04 or less	・There are specific hazardous substances in decomposed products ・Changed from cis-1,2-dichloroethylene to 1,2-dichloroethylene on April 1, 2019
1,3-dichloropropene	No, no	0.002 or less	0.02 or less	0.002 or less	No, no
Dichloromethane	No, no	0.02 or less	0.2 or less	0.02 or less	No, no
Tetrachloroethylene	No, no	0.01 or less	0.1 or less	0.01 or less	There are specific hazardous substances in decomposed products
1,1,1-trichloroethane	No, no	1 or less	3 or less	1 or less	There are specific hazardous substances in decomposed products
1,1,2-trichloroethane	No, no	0.006 or less	0.06 or less	0.006 or less	There are specific hazardous substances in decomposed products
Trichloroethylene (*)	No, no	0.01 or less	0.1 or less	0.01 or less	・There are specific hazardous substances in decomposed products ・Changed the standard value on April 1, 2021
Benzene	No, no	0.01 or less	0.1 or less	0.01 or less	No, no
Cadmium and its compounds(*)	45 or less	0.003 or less	0.09 or less	0.003 or less	Changed the standard value on April 1, 2021
Hexavalent chromium compounds	250 or less	0.05 or less	1.5 or less	0.05 or less	No, no
Cyanide compounds	50 or less As a free cyan	Not detected	1.0 or less	Not detected	No, no
Mercury and its compounds	15 or less	0.0005 or less, In addition, alkyl mercury is not detected	0.005 or less, In addition, alkyl mercury is not detected	0.0005 or less, In addition, alkyl mercury is not detected	No, no
Selenium and its compounds	150 or less	0.01 or less	0.3 or less	0.01 or less	No, no
Lead and its compounds	150 or less	0.01 or less	0.3 or less	0.01 or less	No, no
Arsenic and its compounds	150 or less	0.01 or less	0.3 or less	0.01 or less	No, no
Fluorine and its compounds	4,000 or less	0.8 or less	24 or less	0.8 or less	No, no
Boron and its compounds	4,000 or less	1 or less	30 or less	1 or less	No, no
Zimazine	No, no	0.003 or less	0.03 or less	0.003 or less	No, no
Chiuram	No, no	0.006 or less	0.06 or less	0.006 or less	No, no
Thiobencarb	No, no	0.02 or less	0.2 or less	0.02 or less	No, no
Polychlorinated biphenyl (PCB)	No, no	Not detected	0.003 or less	Not detected	No, no
Organic phosphorus compounds (paration, methylparation, methyldi Meton, and EPN)	No, no	Not detected	1 or less	Not detected	No, no

※As of April 1, 2021, the standards for cadmium and its compounds and trichlorethylene have been changed.

Standards for trichlorethylene, cadmium and its compounds (prior to March 31, 2021)
Specific Hazardous Substances and Designated Criteria	Soil content standards （㎎/㎏）	Standard for Soil Elution （㎎/ℓ）	Second elute volume standard （㎎/ℓ）	Groundwater purification standards （㎎/ℓ）
Trichloroethylene	No, no	0.03 or less	0.3 or less	0.03 or less
Cadmium and its compounds	150 or less	0.01 or less	0.3 or less	0.01 or less

Standards for dioxins (only applicable to ordinances)

Dioxins
Items	Standards for Soil Contamination （ｐｇ-TEQ／ｇ）	Groundwater purification standards （ｐｇ-TEQ／ℓ）
Dioxins	1,000 or less	1 or less

Related Websites

・Specific Hazardous Substances and Designated Criteria

Inquiries to this page

Green Environment Bureau Water and Soil Environment Division

Phone: 045-671-2494

Fax: 045-671-2809

E-Mail address mk-dojo@city.yokohama.lg.jp

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