Monitoring
Monitoring activities
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Monitoring overview (PDF)
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(1) TEPCO
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Source Monitoring - Tokyo Electric Power Company Holdings, Inc. (Coming Soon)
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Dilution / Discharge Facility Conditions (Real Time Data) - Tokyo Electric Power Company Holdings, Inc. (English)
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Dilution / Discharge Facility Conditions (Real Time Data) - Tokyo Electric Power Company Holdings, Inc. (Korean)
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Dilution / Discharge Facility Conditions (Real Time Data) - Tokyo Electric Power Company Holdings, Inc. (中国簡体字)
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Dilution / Discharge Facility Conditions (Real Time Data) - Tokyo Electric Power Company Holdings, Inc. (台湾繁体字)
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Dilution / Discharge Facility Conditions (Real Time Data) - Tokyo Electric Power Company Holdings, Inc. (香港繁体字)
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Sea Area Monitoring - Tokyo Electric Power Company Holdings, Inc.
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(2) IAEA
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Real Time Monitoring - IAEA *Same data as Dilution / Discharge Facility Conditions (Real Time Data) of TEPCO
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IAEA Marine Monitoring (Before)
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2025 IAEA Marine Monitoring (Press Release)
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2024 IAEA Marine Monitoring (Press Release)
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2023 IAEA Marine Monitoring (Press Release)
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2022 IAEA Marine Monitoring (Press Release)
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2021 IAEA Marine Monitoring (Press Release)
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IAEA Marine Monitoring (Publication of the Results)
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Release of IAEA report regarding Marine Monitoring in 2023 (January 6, 2025)
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Release of IAEA report regarding Marine Monitoring in 2022 (December 12, 2023)
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Release of IAEA report regarding Marine Monitoring in 2021 (June 27, 2022)
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Interlaboratory Comparison (Publication of the Results)
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Publication of the Results for the IAEA’s Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water (March 25, 2025)
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Publication of the Results for the IAEA’s Interlaboratory Comparison on the Determination of Radionuclides in the Marine Environment (March 25, 2025)
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Publication of the Results for the IAEA’s Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water and the Marine Environment (January 30, 2024)
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Publication of the Results for the IAEA’s First Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water (June 1, 2023)
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Additional Measures (Before / After)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (July 9, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (July 2, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (June 25, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (June 16, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (May 29, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (May 22, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (February 5, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (January 28, 2026)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (December 5, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (November 28, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (September 10, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (August 28, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (June 17, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (June 13, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (April 15, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (April 11, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (Results) (February 21, 2025)
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Additional Measures under the IAEA Framework Related to the Discharge of ALPS Treated Water into the Sea (February 4, 2025)
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Additional Measures (Publication of the Results)
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Publication of the Report on the Analytical Results of the Additional Measures under the IAEA Framework related to the Discharge of ALPS Treated Water into the Sea (May 1, 2026)
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Publication of the reports on the analytical results of the Additional Measures under the IAEA framework related to the discharge of ALPS treated water into the sea (October 7, 2025)
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Publication of the reports on the analytical results of the Additional Measures under the IAEA framework related to the discharge of ALPS treated water into the sea (June 6, 2025)
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(3) Others
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Sea Area Monitoring - MOE and Relevant Ministries
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Sea Area Monitoring - NRA
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Fishery Products Monitoring - Fisheries Agency