Veterans who served at K2 or around PFAS often hear that no presumption means no claim. That is not the full picture. Recognition is still developing, and veterans who document their exposure now, through the screening, site records, and dated symptom notes, are the ones who benefit fastest when the rules expand. Sometimes that includes effective dates that reach back.
Where these exposures stand today
Two toxic exposure areas come up often for newer generations of veterans: service at Karshi-Khanabad in Uzbekistan, known as K2, and exposure to PFAS, a family of long-lasting industrial chemicals. The rules in both areas are still developing. Part of the picture is recognition. Part is work in progress.
K2 (Karshi-Khanabad)
K2 was a base in Uzbekistan used early in post-2001 operations. Veterans who served there have reported a range of illnesses. The site had documented environmental hazards including fuel, solvents, and other contaminants. VA acknowledges K2 service as a potential exposure and encourages affected veterans to get the toxic exposure screening and to file claims. Some K2-related conditions may be addressed through PACT Act pathways and individual claims, but a broad K2-specific presumptive list is still limited. The practical takeaway: do not wait for a perfect presumption to document your service and symptoms.
PFAS
PFAS, sometimes called forever chemicals, were used in firefighting foam and many base operations, and have been found in drinking water at some installations. The health research is active, and VA tracks it through its public health program. As of now, PFAS exposure is not a blanket presumptive on its own. A PFAS-based claim usually rests on the standard evidence: a current diagnosis, evidence of exposure during service, and a medical opinion linking the two.
Why documentation matters now
When the presumptive list has not caught up to the science, the veteran with documented exposure is in the strongest position later. That means:
- Get the VA toxic exposure screening and name K2 or the PFAS exposure specifically.
- Save anything that places you at the site or base during the relevant time.
- Keep a record of symptoms and diagnoses, with dates.
- Watch for new presumptive announcements, and revisit a denied claim if the rules change. Effective date rules can reach back.
You can track proposed VA rule changes, including open comment windows, on our rule tracker.
What veterans should expect
These areas can be frustrating because the answer is sometimes "not yet" rather than a clear yes or no. File on the evidence you have, document carefully, and stay alert to changes. The PACT Act showed that recognition can expand quickly. Good records let you benefit from that expansion as soon as it happens.
This is educational. It is not legal advice. A VA-accredited representative can help you build an exposure claim while the rules continue to develop.
Sources
- VA Public Health, Karshi-Khanabad (K2) exposures
- VA Public Health, PFAS exposure
- VA PACT Act and toxic exposure resources
- VA, The PACT Act and your VA benefits