Declared national stockpiles of chemical weapons have now been destroyed under the Chemical Weapons Convention (CWC)—but that does not mean every chemical weapon or related danger has disappeared. The Organisation for the Prohibition of Chemical Weapons (OPCW) verified destruction of the last weapon in those declared stockpiles on 7 July 2023, at the Blue Grass Chemical Agent-Destruction Pilot Plant in Kentucky.
What “all declared stockpiles destroyed” means
The CWC entered into force in 1997 and bans chemical weapons. The OPCW implements the convention and verifies the destruction of declared stockpiles. On 7 July 2023, it confirmed that the final weapon in the declared national stockpiles had been destroyed and verified. The OPCW called the milestone important, while continuing its broader work to prevent chemical weapons from returning.
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The scale of the completed programme is reflected in two OPCW figures. In its 7 July 2023 announcement, the organisation reported that it had verified the destruction of 72,304.34 metric tonnes of stockpiled chemical weapons since the CWC entered into force. Its statistics dashboard reports 72,304 metric tonnes declared and destroyed, or 100% of declared stockpiles, as of 31 December 2025. The later figure is rounded; it is not a conflicting total.
How were chemical weapons destroyed?
There was no single process applied identically to every munition and agent. Destruction programmes used controlled methods suited to the materials and facilities involved, under OPCW verification. The organisation describes approaches including high-temperature destruction and lower-temperature neutralisation followed by treatment of the resulting by-products. Those by-products also require treatment and final disposal under national regulations.
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This distinction matters: destroying a weapon or neutralising its agent is not necessarily the final step. Remaining materials and by-products must be managed safely, and facilities remain subject to verification and closure processes. The precise method used at a particular site depends on its official site records; a general description should not be taken as a claim that every facility used the same technology.
Why destruction was a major undertaking
Eliminating declared arsenals meant handling large quantities of hazardous agents and munitions through controlled programmes rather than simply disposing of conventional equipment. The OPCW’s work combined destruction with verification, while national programmes had to address the treatment and disposal of materials left by the process. The treaty’s achievement is therefore not only that declared stockpiles were destroyed, but that their elimination was subject to an international verification regime.
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What risks and work remain
The 2023 milestone applies specifically to declared stockpiles from States Parties. It does not establish that every chemical weapon anywhere has been found or destroyed. The OPCW continues to address old and abandoned chemical weapons, non-stockpiled weapons, ongoing verification, and the possibility that chemical weapons could re-emerge. Its statistics page, with figures through 31 December 2025, also records continued inspection activity.
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Sources and further reading
- OPCW: All declared chemical weapons stockpiles verified as irreversibly destroyed (7 July 2023)
- OPCW: Eliminating Chemical Weapons
- OPCW by the Numbers (data as of 31 December 2025)
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