Report on IAEA Additional Monitoring of ALPS-Treated Water Release
Overview
The Japan Fisheries Agency announced the publication of a report on additional monitoring conducted by the IAEA in September 2025. The report states that the radiation impact of releasing ALPS-treated water into the ocean is consistent with the conclusions of the IAEA’s comprehensive report from July 2023. Japanese analytical laboratories, IAEA personnel, and laboratories from third countries participated in the selection and analysis of seafood.
Key points
- The full report is available on the IAEA website.
- Seafood was selected from catches landed at fishing ports in Iwaki City, Fukushima Prefecture.
- Experts from third-country analytical laboratories participated from South Korea, Switzerland, China, New Zealand, and Russia.
Overview
The IAEA is conducting additional monitoring under an arrangement agreed by Japan and the IAEA in September 2024 to expand conventional monitoring within the IAEA framework. The Japan Fisheries Agency announced that a report on the results of the monitoring conducted in September 2025 had been published.
Impact
The IAEA states that the contents of this report are consistent with the conclusions of its comprehensive report from July 2023, which found that the radiation impact on people and the environment from releasing ALPS-treated water into the ocean would be negligible.
Details
As part of the additional monitoring, on September 10, 2025, IAEA personnel and experts from third-country analytical laboratories designated by the IAEA selected seafood landed at fishing ports in Iwaki City, Fukushima Prefecture.
The selected seafood was analyzed separately by Japanese analytical laboratories, IAEA personnel, and third-country analytical laboratories. The IAEA published a report on the analysis results on October 28, 2026.