Inspection of radioactive materials in tap water

Last Updated September 18, 2024

Regarding radioactive materials in tap water, the Ministry of Health, Labour and Welfare's notice “Settings of Management Target Values for Radioactive Materials in Tap Water” (No. 0305 No. 2 of Kensui dated March 5, 2012 (PDF: 393KB)) sets new management target values from April 1, 2012, and the notification shows inspection methods. Based on this notice, Yokohama City conducts inspections of radioactive materials in tap water. For recent test results, see the measurement results of radioactive materials in tap water and raw tap water.

Summary of management target values for radioactive materials in tap water and test results at water purification plants in Yokohama City

Overview of test results
Management target value	Inspection results of water purification plants in Yokohama City
10 becquerels/kg or less (Total of cesium-134 and 137)	Tap water	Raw tap water
10 becquerels/kg or less (Total of cesium-134 and 137)	Not detected	Not detected

※Please see here for changes in management target values.
https://translate-en.city.yokohama.lg.jp/kurashi/sumai-kurashi/suido-gesui/suido/faq/houshaseiQA.html

※In addition, please see homepage of Kanagawa wide area water supply corporation from the following link for test result of radioactive material in water purification plant of Kanagawa wide area water supply corporation which supplies tap water to Yokohama-shi.

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
※Please be careful not to make a mistake.

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