ＰＦＡＳの地下水調査、２４２地点で暫定目標値超過　環境省

　環境省は２５日、発がん性が疑われる有機フッ素化合物「ＰＦＡＳ」について、全国の地下水や河川の調査結果を発表した。２０２３年度は東京、神奈川、大阪、広島、沖縄など２２都府県の２４２地点で国の暫定目標値を超えた。いずれも飲用ではなかった。このうち今回新たに超過が確認されたのは４２地点だった。
　ＰＦＡＳはかつて、はっ水加工や泡消火剤などに使われてきた。国は２１年までに代表物質「ＰＦＯＳ」と「ＰＦＯＡ」の製造・輸入を禁止。両物質の合算で１リットル当たり５０ナノグラム（ナノは１０億分の１）の暫定目標値を設定している。
　３９都道府県が２３年度に２０７８地点で実施した測定結果を同省がまとめた。濃度が最も高かったのは大阪府摂津市の地下水で、目標値の５２０倍に当たる２万６０００ナノグラム。米軍基地が集中する沖縄県嘉手納町では、測定した全１３地点で目標値を超えていた。（2025/04/25-10:14）

Concentrations of PFAS, potentially carcinogenic chemicals, in groundwater and river water exceeded Japan's provisional standard at 242 locations in 22 of the country's 47 prefectures in fiscal 2023, an Environment Ministry survey showed Friday.
   None of the groundwater or river water was used for drinking. Of the 242 sites in the 22 prefectures including Tokyo, Kanagawa, Osaka, Hiroshima and Okinawa, the PFAS levels were newly found to have exceeded the standard at 42 locations.
   PFAS, or perfluoroalkyl and polyfluoroalkyl substances, were once used for water-repellent finishing and foam-extinguishing agents. The country had banned the production and import of PFOS and PFOA, both of which are main components of PFAS, by 2021.
   The government has set a provisional target of limiting the combined amount of PFOS and PFOA to 50 nanograms per liter of tap water.
   The ministry survey is based on the results of measurements conducted by 39 prefectures at 2,078 sites in fiscal 2023, which ended in March 2024. Groundwater in the city of Settsu, Osaka, had the highest concentration, at 26,000 nanograms, 520 times the standard. PFAS concentrations exceeded the standard at all 13 sites surveyed in the town of Kadena, Okinawa, home to many U.S. military bases.