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- Guidance on countermeasures against groundwater pollution
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Guidance on countermeasures against groundwater pollution
Last Updated October 2, 2024
Yokohama City provides guidance to persons responsible for groundwater contamination in accordance with the Ordinance on conservation, etc. of Yokohama City Living Environment (hereinafter referred to as the “Ordinance”).
Notification of Groundwater Pollution Countermeasures
Persons who conduct business or conduct business on land that is deemed to be the cause of groundwater pollution should conduct a survey on the cause of groundwater pollution based on Article 61-2 of the Ordinance. May be instructed. In that case, we will endeavor to notify Yokohama City of a report on the cause of groundwater contamination.
In addition, based on Article 61-3 of the Ordinance, measures must be taken to purify the water quality of groundwater, in which case, it is necessary to submit a groundwater purification measure result report to Yokohama City.
Notification style
In principle, all administrative documents such as the registration form are subject to disclosure. Please read "Handling of Administrative Documents Associated with Information Disclosure System" before creating the registration form.
registration form, please submit at window, mail or Yokohama-shi electronic application, report system (outside site). In addition, when submitting by mail or electronic application, please be sure to consult the details of the notification in advance by e-mail etc.
| Number | Name | Basis clause | Style | Reference Materials |
|---|---|---|---|---|
| 1 | Groundwater Pollution Cause Investigation Report | Ordinance Article 61-2, Paragraph 2 | Detailed Regulations No. 5 Style (Word: 27KB) | Example of entry (PDF: 275KB) |
| 2 | Report on the results of groundwater purification measures | Ordinance Article 61-3, Paragraph 2 | Detailed No. 7 Style (Word: 31KB) | Example of entry (PDF: 279KB) |
※Detailed No. 6 style is missing.
Groundwater purification standards
The ordinance enforcement regulations separate table No. 15 (outside site) stipulates groundwater purification standards for underground infiltration prohibited substances. For points that exceed the groundwater purification standards, we provide guidance to persons responsible for pollution based on the ordinance.
| Types of substances prohibited from infiltration | Standard value | Remarks |
|---|---|---|
| Cadmium and its compounds | As cadmium 0.003 | Revised on October 1, 2012 Before revision 0.01 |
| Cyanide compounds | Not detected. | None |
| Organic phosphorus compounds (limited to palation, methylparation, methyl dimeton and EPN) | Not detected. | None |
| Lead and its compounds | As lead 0.01 | None |
| Hexavalent chromium compounds | As hexavalent chromium 0.05 | None |
| Arsenic and its compounds | As arsenic 0.01 | None |
| Mercury and alkyl mercury and other mercury compounds | As mercury 0.0005 | None |
| Alkyl mercury compounds | Not detected. | None |
| Polychlorinated biphenyl | Not detected. | None |
| Trichloroethylene | 0.01 | Revised on October 21, 2015 Before revision 0.03 |
| Tetrachloroethylene | 0.01 | None |
| Dichloromethane | 0.02 | None |
| Carbon tetrachloride | 0.002 | None |
| 1,2-dichloroethane | 0.004 | None |
| 1,1-dichloroethylene | 0.1 | None |
| 1,2-dichloroethylene | As the total amount of cis and transformers 0.04 | Revised on October 1, 2012 Before revision, “cis-1,2-dichloroethylene: 0.04” |
| 1,1,1-trichloroethane | 1 | None |
| 1,1,2-trichloroethane | 0.006 | None |
| 1,3-dichloropropene | 0.002 | None |
| Chiuram | 0.006 | None |
| Zimazine | 0.003 | None |
| Thiobencarb | 0.02 | None |
| Benzene | 0.01 | None |
| Selenium and its compounds | As selenium 0.01 | None |
| Boron and its compounds | As a boron １ | None |
| Fluorine and its compounds | As fluorine 0.8 | None |
| Ammonia, ammonium compounds, nitrite compounds and nitrate compounds | Nitrite nitrogen and nitrite Total amount of acidic nitrogen 10 | None |
| Dioxins | 1 | None |
| Vinyl chloride monomer | 0.002 | New addition on October 1, 2012 |
| 1,4-dioxane | 0.05 | New addition on October 1, 2012 |
(unit mg/L, pg-TEQ/L for dioxins)
[Remarks]
- "Not detected" means that when measured by the method listed in the column of measurement method, the result falls below the quantitative limit of the method.
- Dioxins are applied only to those pertaining to establishments subject to the dioxin regulatory standards specified in Appendix 11.
※About the details of remarks, please see the regulations enforcement regulations separate table 11, separate table 15 (outside site) about conservation of Yokohama-shi living environment.
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Inquiries to this page
Water and Soil Environment Division, Environmental Conservation Department, Yokohama City Green Environment Bureau
Telephone: 045-671-2494
Telephone: 045-671-2494
Fax: 045-671-2809
Email address: mk-dojo@city.yokohama.lg.jp
Page ID: 294-458-591
