Toxic Chemicals Detected in Rivers and Groundwater Across Japan

Apr 25, 2025 | News On Japan

TOKYO - Organic fluorine compounds known as PFAS—suspected to be harmful to human health—have been detected at concentrations exceeding the national provisional target in rivers and groundwater at 242 sites across 22 prefectures, according to a government survey.

Among PFAS substances, two compounds in particular—PFOA and PFOS—are considered hazardous. Japan's Ministry of the Environment has set a provisional target of no more than 50 nanograms per liter for the combined concentration of these two chemicals in rivers and groundwater.

The ministry's fiscal 2023 survey, which examined 2,078 sites in 39 prefectures, revealed that 242 sites in 22 prefectures surpassed the government's target for PFOA and PFOS concentrations.

The highest level was found in groundwater in Settsu City, Osaka Prefecture, measuring 26,000 nanograms per liter—520 times the national target.

The ministry has urged local authorities to ensure that water from these sites is not used for drinking purposes.

Source: TBS

Typhoon No. 25 Threatens Kanto and Izu Islands

Large Typhoon No. 25 was moving northwest over waters south of Japan at 3 p.m. on September 19 and is forecast to strengthen as it approaches Kanto and the Izu Islands from September 20 through September 21, bringing the risk of torrential rain, violent winds and further damage in areas still recovering from last year's typhoon.

Bear Sighting Raises Alarm at Popular Tokyo Hiking Spot

A black bear has been spotted near one of the most popular hiking trails on Mount Takao in western Tokyo, prompting authorities to urge visitors to take precautions ahead of the five-day Silver Week holiday and the approaching autumn foliage season.

Starbucks Considers Selling Majority Stake in Japan Business

Starbucks is considering selling a majority stake in its Japanese business, potentially valued at as much as $3 billion, or about 470 billion yen, as the U.S. coffee chain seeks to concentrate management resources on its struggling North American operations.

Halloween Jumbo Lottery Goes on Sale With 400 Million Yen Top Prize

Japan's Halloween Jumbo Lottery went on sale nationwide on September 16, offering a combined top payout of 400 million yen for the first prize and its adjacent-number prizes.

Shinkansen Introduces New Luxury Private Compartment

A new top-tier "Supreme Class" offering fully private compartments above the level of Green Car service will debut on the Tokaido and Sanyo Shinkansen on October 1, with passengers able to experience the new seating at a demonstration booth at Shin-Osaka Station.

MEDIA CHANNELS

MORE Sci-Tech NEWS

Rare Pod of About 50 Dolphins Spotted in Seto Inland Sea

A rare pod of around 50 dolphins was spotted swimming through the Seto Inland Sea off Ozu, Ehime Prefecture, with dozens of dorsal fins repeatedly breaking the surface as the animals moved together.

Cybercab Arrives in Japan

Tesla unveiled its Cybercab in Japan for the first time on September 11, showcasing an AI-powered autonomous taxi designed without a steering wheel or pedals.

Footage Shows Tokyo Flood Control Tunnel After Heavy Rain

Large volumes of floodwater poured into the Metropolitan Area Outer Underground Discharge Channel in Kasukabe, Saitama Prefecture, following heavy rain on September 7, prompting the massive underground flood-control facility known as the "Underground Temple" to go into operation.

Lights Out for Fluorescent Lamps

Fluorescent lamps that have illuminated Japanese homes and workplaces for decades are approaching the end of production, with Panasonic preparing to wind down a business it has operated since 1951 while experts warn that incorrectly replacing some fixtures with LEDs could create a fire risk.

Dry Fog Finds New Uses in Industry, Farming and Tourism

Osaka-based spray nozzle maker IKEUCHI is expanding applications for its proprietary "Dry Fog," an ultra-fine mist that can cool, humidify and create visual effects without leaving surfaces wet, with the technology now being used in factories, livestock farming, crop cultivation and tourist attractions in Japan and overseas.

Japan Moves to Commercializing Low-Power Optical Computing

Japanese companies are moving closer to commercializing photonics-electronics convergence technology that replaces part of conventional electrical data transmission with optical signals, potentially allowing huge volumes of data to move with lower latency while sharply reducing power consumption as artificial intelligence drives rapid growth in electricity demand from data centers.

Just 27 Centimeters Could Dramatically Reduce Power Consumption

A new generation of optoelectronic integration technology developed over four decades by Japanese companies is moving closer to commercialization, offering a way to transmit huge volumes of data with low latency while sharply reducing the electricity consumed by data centers as artificial intelligence drives explosive growth in computing demand.

CameraJet Connects Cleaning Coaching and Privacy

Dyson CameraJet™ turns the smart toothbrush into an active sensing product, making useful feedback and clear privacy design part of the same engineering brief.

< 2 3 4 5 >