For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.
Water Works Bureau Customer Service Center
Telephone: 045-847-6262 Fax: 045-848-4281
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Last Updated December 18, 2024
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In response to the growing interest in organic fluorine compounds that have been reported recently, we are pleased to announce City of Yokohama, Water Works Bureau's test results for organic fluorine compounds that have received many inquiries.
In Yokohama City, since 2011, PFOS and PFOA have been inspected among organic fluorine compounds (PFAS) of tap water and tap water (water before water purification treatment) at three water purification plants in the city. . Until now, the provisional target value (50 ng / L) set by the government has never been exceeded. In addition, since FY2022, PFHxS has been inspected (the target value has not been set for PFHxS).
Detailed data is posted in the test results of organic fluorine compounds at water purification plants.
Please refer to the water quality inspection point for the water distribution area of the water purification plant.
For Q & A about organic fluorine compounds, see the page on organic fluorine compounds in tap water.
PFOS, PFOA, and PFHxS of tap water and raw tap water at 3 water purification plants in the city inspected after 2021 were all below the lower limit of quantification. The lower limit of quantification is the minimum concentration that City of Yokohama, Water Works Bureau can measure accurately.
In addition, as a reference, we will post the PFOS, PFOA, and PFHxS test results of tap water and raw tap water from 2022 by the Kanagawa Prefectural Wide Area Water Supply Corporation, which supplies tap water to Yokohama City. PFOS, PFOA, and PFHxS of tap water and raw tap water supplied to the city inspected after 2022 were all below the lower limit of quantification. The lower limit of quantification is the minimum concentration that can be accurately measured by the Kanagawa Prefectural Wide Area Water Supply Corporation.
Test results of 2024 organic fluorine compounds (water purification plant) (PDF: 105KB)
Test results of organic fluorine compounds in 2023 (water purification plant) (PDF: 83KB)
Test results of organic fluorine compounds in 2022 (water purification plant) (PDF: 81KB)
Test results of organic fluorine compounds in 2021 (water purification plant) (PDF: 111KB)
Water Works Bureau Customer Service Center
Telephone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.
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Water Quality Division, Water Works Bureau Water Purification Department
Telephone: 045-371-5656
Telephone: 045-371-5656
Fax: 045-371-6942
Email address: su-suishitsu@city.yokohama.lg.jp
Page ID: 947-721-211