About inspection of radioactive material tap water

Last updated on September 18, 2024.

Regarding radioactive material in tap water, the Ministry of Health, Labour and Welfare notified “Settings of Management Target Values for radioactive material in Tap Water” (No. 0305, No. 2 (PDF: 393KB) dated March 5, 2012), and new management target values have been set from April 1, 2012. Based on this notice, Yokohama City conducts inspections of radioactive material of tap water. For recent test results, please refer to the radioactive material measurement results for tap water and raw tap water.

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

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://www.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 inspection 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

Phone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.

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