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Cases / Protected area / relocation · Japan · 2014–2026

Okinawa pays for US base PFAS treatment as Henoko cost rises to 930 billion yen

Short record: the main facts, with sources. A full case file has not been prepared.

Nature's voice · report
No measurement of the harm done to me here is on record.
Did nature suffer? Not measured.
What the record lacks: 3 none on record · 1 insufficient · 1 not measured See the gaps

Okinawa's prefectural government has paid for PFAS water treatment linked to US base contamination, after on-base inspection requests were rejected four times since 2016. The Henoko base relocation cost estimate rose from 350 billion yen in 2014 to 930 billion yen in 2019.

What?
Okinawa's prefectural government has paid for PFAS treatment linked to US base contamination, while the Henoko relocation cost has risen and its landfill is 17.5% complete. Ryukyu Shimpo
Where?
Okinawa, Japan (US bases; Henoko on the same island) Ryukyu Shimpo
When?
Inspection requests since 2016; treatment costs to date and projected over ten years; Henoko estimates for 2014 and 2019; landfill status in March 2026. Ryukyu Shimpo
Who?
Gained
  • US military — Base-related PFAS treatment costs have been carried by the prefecture rather than the US, according to the reporting Ryukyu Shimpo
Lost
  • Okinawa prefectural taxpayers — Paid 1.2 billion yen for PFAS treatment so far Ryukyu Shimpo
Harmed
  • Residents whose drinking water contained PFAS — Treatment was needed; the reporting does not describe health effects Ryukyu Shimpo
Why?
Not stated in the sources reviewed.
How?
On-base inspections were refused, PFAS treatment costs passed to the prefecture, and the relocation cost estimate was revised upward while landfill progress is slow. Ryukyu Shimpo
6 of 6 questions answered from the record

What happened

The record, in order.

Ryukyu Shimpo and Akahata reported that Okinawa's prefectural government had paid 1.2 billion yen for PFAS treatment of drinking water, and expects to pay 8 billion yen or more over the next ten years.

The same reporting says the prefecture requested on-base PFAS inspections four times since 2016, and each request was rejected.

Akahata reported in May 2026 that the Henoko cost estimate had risen from 350 billion yen in 2014 to 930 billion yen, and that landfill was 17.5% complete by March 2026.

    In court and with insurers

    Every proceeding and every insurer decision on record.

    Lawsuits and rulings

    No court case on record. No court has ruled on this case.

    Insurers

    No insurer decision on record.

    What we don't know

    Undisclosed, unproven, untried: recorded as data.

    Nature

    • Not measured Harm to nature: The record holds no measurement of harm to nature.

    Record

    • Insufficient Reported but not verified: the US Department of Defense's remaining environmental cleanup cost was about USD 48.7 billion as of 30 September 2024; the DENIX table could not be checked.
    • None on record The sources reviewed do not include the text of the Status of Forces Agreement (SOFA), so its effect on PFAS cleanup is not established here.
    • None on record The sources reviewed do not confirm which base or activity caused the PFAS contamination.
    • None on record The sources reviewed do not say whether the 1.2 billion yen covers all Okinawa bases or only drinking water.

    Did the harm stop?

    Not stated in the sources reviewed.

    Who paid?

    Not stated in the sources reviewed.

    Sources

    Voices on record: — Company or project— Government and regulators— Courts✓ Press and investigations— Communities and civil society— Researchers

    Press and investigations

    Connected cases

    Related matters, and cases linked to this one through the same organisations, with the role each played in both.
    Terms used on this page

    Science and environment

    PFOA (C8) and PFAS
    PFAS are a large family of human-made chemicals that persist in the environment and the body; PFOA, also called C8, is one of them and was used to make Teflon.
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