Follow-up survey of polluted wells in FY2019

Last update date April 2, 2024

On this page, in Hino 5-chome, Higashimatanocho, Totsuka-ku, Nakatakita, Izumi-ku, Nakatakita, Izumi-ku, Nakata-Kita, Izumi-ku, where groundwater contamination was confirmed. The measurement results of 1-chome, Izumi-ku (former Izumi-cho), Araicho, Hodogaya-ku are shown.

Follow-up survey results of polluted wells for groundwater quality (FY2019)
Survey point number	Standard value	705	720	722	723	724	726	729	741
Prefectural mesh number	Nothing	0476	0349	1400	1400	1400	1400	1309	1484
Ward name	Nothing	Konan Ward	Totsuka Ward	Izumi Ward	Izumi Ward	Izumi Ward	Izumi Ward	Izumi Ward	Hodogaya Ward
Street name	Nothing	5, Hino	Higashimatanocho	1, Nakatakita	1, Nakatakita	1, Nakatakita	1, Nakatakita	2, Izumichuokita	Niimachi
Date of collection	Nothing	October 8, 2019	October 8, 2019	October 17, 2019	October 17, 2019	October 17, 2019	October 17, 2019	October 17, 2019	October 17, 2019
Cadmium (environmental standard items)	0.003	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
All cyanes (environmental standard items)	Not detected	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Lead (environmental standard items)	0.01	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Hexavalent chromium (environmental standard items)	0.05	Unexamined	<0.02	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Arsenic (Environmental Standard Items)	0.01	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Total mercury (environmental standard items)	0.0005	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
PCBs (environmental standard items)	Not detected	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Dichloromethane (environmental standard items)	0.02	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Carbon tetrachloride (environmental standard items)	0.002	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Vinyl chloride monomer (environmental standard items)	0.002	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	0.0003
1,2-dichloroethane (environmental standard items)	0.004	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
1,1-dichloroethylene (environmental standard items)	0.1	0.0003	0.0005	<0.0002	<0.0002	<0.0002	<0.0002	<0.0002	Unexamined
1,2-dichloroethylene (environmental standard items)	0.04	0.046	0.0006	0.016	0.0043	0.015	0.0027	<0.0004	0.12
1,1,1-trichloroethane (environmental standard items)	1	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
1,1,2-trichloroethane (environmental standard items)	0.006	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Trichloroethylene (Environmental Standards)	0.01	0.050	0.0032	0.0022	0.0009	0.0023	0.0006	<0.0002	0.042
Tetrachloroethylene (Environmental Standards)	0.01	0.082	0.012	0.32	0.15	0.28	0.15	0.084	Unexamined
1,3-dichloroppine (environmental standard items)	0.002	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Tylum (environmental standard items)	0.006	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Shimadine (environmental standard items)	0.003	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Thiobencarb (environmental standard items)	0.02	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Benzene (environmental standard items)	0.01	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Selenium (environmental standard items)	0.01	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Nitrate nitrogen and nitrite nitrogen (environmental standard items)	10	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Fluorine (environmental standard items)	0.8	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Boron (environmental standard items)	1	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
1,4-dioxane (environmental standard items)	0.05	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Chloroform (city original)	0.06	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined	Unexamined
Electric conductivity (mS/m) (General item)	Nothing	51.9	14.3	21.9	29.2	21.6	22.6	25.0	16.8
pH (general items)	5.8 or more 8.6 or less	6.8	6.6	7.2	6.5	6.8	6.3	7.0	7.0
Water temperature (°C) (General item)	Nothing	25.0	25.0	19.2	19.1	19.7	19.5	17.7	17.4
Odor (general items)	Nothing	Odor-free	Odor-free	Odor-free	Odor-free	Odor-free	Odor-free	Odor-free	Odor-free
Appearance (general items)	Nothing	Pale yellow and transparent	Colorless and transparent	Colorless and transparent	Colorless and transparent	Colorless and transparent	Colorless and transparent	Colorless and transparent	Colorless and transparent

(Concentration unit: mg/L)

The pH value is the standard value for tap water quality.

The reference value for chloroform is the guideline value for monitoring items (outside site).

For inquiries to this page

Yokohama City Green Environment Bureau Environmental Conservation Department Water and Soil Environment Division

Phone: 045-671-2494

Fax: 045-671-2809

Email address: mk-dojo@city.yokohama.lg.jp

List of related pages Open the menu in the related page list

Guidance on groundwater pollution countermeasures
Investigation of groundwater pollution conducted in Yokohama City
Fiscal 2023 Somei Somei Somei
Fiscal 2022 Somei Somei Following Survey
Fiscal 2021 Somei Somei Somei FY2021
Following Survey of Contaminated Wells in FY2020
Follow-up survey of polluted wells in FY2019

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Page ID: 728-722-285