VA Toxic Exposure Claims
Military Toxic Exposure VA Claims: A Veteran's Guide
Medically reviewed by the Patriot Path Medical Team
Licensed MD reviewers • Last updated: July 2026
A military toxic exposure VA claim connects a diagnosed condition to a hazard you encountered in service, burn pit smoke, contaminated water, chemicals, or radiation. If your condition is on a VA presumptive list and your service matches the qualifying window and location, the connection is presumed and a nexus letter is generally not needed. If not, the claim is decided by the medical evidence, and a physician's nexus opinion usually decides it. This guide walks both paths: what counts as toxic exposure, what the PACT Act changed, and exactly when you need medical backup.
A veteran's story
Marcus spent six years turning wrenches on the flight line, hands in degreaser and JP-8 most days, no protective gear anyone thought to question. Fifteen years later a neurologist diagnosed peripheral neuropathy in both feet. His VSO checked the presumptive lists: nothing for jet fuel, nothing for solvents.
He filed anyway, with his diagnosis and his service records. The VA denied the claim. The decision letter said there was no evidence connecting the neuropathy to service, and without a presumption, the VA was not going to make that connection for him.
A physician then reviewed his records, documented the years of solvent and fuel exposure his maintenance logs supported, cited the literature tying chronic solvent exposure to peripheral nerve damage, and gave an opinion in the language the VA requires. On the supplemental claim, the neuropathy was service-connected. Nothing about his exposure had changed. What changed was that a doctor connected the dots on paper.
What Counts as Military Toxic Exposure
Toxic exposure is any contact with a harmful substance during service: what you breathed, drank, touched, or absorbed. Some exposures were obvious at the time, like the black smoke off a burn pit. Others were invisible, like solvent vapor in a maintenance bay or contaminated water coming out of a base tap. Most veterans were never told, and many exposures only became a health problem years or decades later.
The four routes below cover nearly every exposure the VA sees. Each links to a dedicated guide with the service windows, the recognized conditions, and the claim path for that exposure.
Airborne hazards
Burn pit smoke, sand and dust, particulate matter, oil well fires, and diesel exhaust. The dominant exposure of the Gulf War and post-9/11 eras, and the one the PACT Act was largely written for.
Contaminated water
Industrial solvents and fuel compounds in base drinking water, Camp Lejeune being the defining case, and firefighting foam chemicals (PFAS) that reached groundwater on and around installations.
Chemicals handled on the job
Herbicides like Agent Orange, industrial solvents and degreasers, jet fuel and JP-8, asbestos in ships and buildings, and lead. Often a daily, low-grade exposure that adds up over a career.
Radiation
Nuclear weapons testing, cleanup operations at sites like Enewetak Atoll, submarine and reactor work, and occupational sources such as radar and depleted uranium.
Find your exposure and go deep:
- Burn pits and airborne hazards
- Agent Orange
- Camp Lejeune water
- Gulf War illness
- AFFF and PFAS
- Jet fuel and JP-8
- Radiation
- Solvents and asbestos
Or start from the toxic exposures hub and browse every exposure the VA recognizes.
The PACT Act: What It Changed and What It Did Not
The PACT Act of 2022 is the largest expansion of veteran toxic exposure benefits in decades. Its core move is the presumption: for listed conditions and qualifying service, the VA concedes the connection to service instead of making you prove it. The law added more than twenty burn pit and airborne hazard conditions, expanded Agent Orange locations beyond Vietnam, and added hypertension and monoclonal gammopathy of undetermined significance (MGUS) to the Agent Orange list.
For burn pits and airborne hazards, the presumptive list now spans two groups. The illnesses: asthma diagnosed after service, chronic bronchitis, COPD, chronic rhinitis, chronic sinusitis, constrictive or obliterative bronchiolitis, emphysema, granulomatous disease, interstitial lung disease, pleuritis, pulmonary fibrosis, and sarcoidosis. The cancers run by category: brain cancer, glioblastoma, melanoma, pancreatic cancer, and any cancer of the head, neck, respiratory tract, gastrointestinal tract, genitourinary system, reproductive system, or the hematologic and lymphatic systems.
The law also changed the machinery underneath claims. Under 38 U.S.C. 1119, the VA now presumes you were exposed to specific substances if you served in designated locations and periods, which removes the old fight over proving the exposure itself. And under 38 U.S.C. 1168, when you claim a condition tied to a toxic exposure risk activity and the file lacks enough evidence to decide, the VA must give you an exam and obtain a medical opinion on the connection, unless it finds no indication of a link between the condition and the exposure.
What the PACT Act did not do is cover everything. It is a list, and lists have edges. Conditions off the list, exposures without a presumption at all (jet fuel, most solvents, PFAS as of this writing), and service that falls outside a qualifying window are all still decided the old way: on the medical evidence you bring.
Quick check: is your condition on a presumptive list?
Search the three big condition lists here at summary level, then confirm the details, including your qualifying window, on the exposure guide. Gulf War illness, radiation, and the no-list exposures work differently and are noted below.
Burn pits and airborne hazards
- Asthma (diagnosed after service)
- Chronic bronchitis
- Chronic obstructive pulmonary disease (COPD)
- Chronic rhinitis
- Chronic sinusitis
- Constrictive or obliterative bronchiolitis
- Emphysema
- Granulomatous disease
- Interstitial lung disease
- Pleuritis
- Pulmonary fibrosis
- Sarcoidosis
- Brain cancer
- Gastrointestinal cancer of any type
- Genitourinary cancer
- Glioblastoma
- Head cancer of any type
- Hematologic and lymphatic cancers
- Lymphoma of any type
- Melanoma
- Neck cancer of any type
- Pancreatic cancer
- Reproductive cancer of any type
- Respiratory cancer of any type
Agent Orange
- AL amyloidosis
- Bladder cancer
- Chloracne and similar acneiform disease
- Chronic B-cell leukemias
- High blood pressure (hypertension)
- Hodgkin's disease
- Hypothyroidism
- Ischemic heart disease
- Monoclonal gammopathy of undetermined significance (MGUS)
- Multiple myeloma
- Non-Hodgkin's lymphoma
- Parkinson's disease
- Parkinsonism
- Peripheral neuropathy (early onset)
- Porphyria cutanea tarda
- Prostate cancer
- Respiratory cancers (including lung cancer)
- Some soft tissue sarcomas
- Type 2 diabetes
Camp Lejeune water
- Adult leukemia
- Aplastic anemia and other myelodysplastic syndromes
- Bladder cancer
- Kidney cancer
- Liver cancer
- Multiple myeloma
- Non-Hodgkin's lymphoma
- Parkinson's disease
- Gulf War illness presumes patterns of symptoms (undiagnosed illnesses and certain chronic multisymptom illnesses) rather than a fixed condition list. Gulf War guide→
- Radiation has its own defined list tied to radiation-risk activities. Radiation guide→
- AFFF and PFAS, jet fuel, and most solvents carry no presumptive list: those claims run on the direct path. AFFF and PFAS guide→
The five-minute head start
Every veteran enrolled in VA health care is entitled to a free toxic exposure screening, repeated at least every five years. It takes minutes, and it puts your exposure history in your VA medical record, where it supports any claim you file later.
For the toxicology behind the law, see our deep dives on military chemical hazards and the PACT Act and military toxicology.
Presumptive or Not: The Fork That Decides Your Claim
Every toxic exposure claim takes one of two paths, and knowing which one you are on before you file changes what you gather, what you expect, and whether you need a doctor's help. The fork comes down to two questions: is your condition on a presumptive list for an exposure the VA recognizes, and does your service match the window and location for that list?
The presumptive path
- Your condition is on a VA presumptive list and your service matches the qualifying window and location.
- The VA concedes the connection under 38 CFR 3.307 and 3.309. You do not have to prove your service caused the condition.
- You still need two things: a current diagnosis on record and proof of qualifying service, usually your DD-214 and service records.
- A nexus letter is generally not needed. Spending money on one here rarely adds anything.
The direct path (non-presumptive)
- Your condition is off the list, your exposure has no presumption, or your service falls outside a window.
- The claim runs as direct service connection under 38 CFR 3.303(d): diagnosis, in-service exposure, and a medical link between them.
- The VA will not assume the link. The medical opinion connecting your condition to your exposure is the evidence that decides the claim.
- This is where a nexus letter earns its keep, and where most denials happen without one.
Exposure conceded is not connection conceded
One more nuance veterans miss: a presumption of exposure is not a presumption of service connection. The VA conceding you breathed burn pit smoke (38 U.S.C. 1119) does not concede that your particular condition came from it unless that condition is also on the list. Off-list conditions ride the direct path even when the exposure itself is conceded, which is exactly the gap a nexus letter closes.
When a Toxic Exposure Claim Needs a Nexus Letter
A nexus letter is a physician's written opinion connecting your diagnosed condition to your exposure. On the direct path it is usually the single most important document in the file, because it supplies the one element the VA cannot get from your records alone: the medical judgment that the exposure at least as likely as not caused the condition.
Your condition is not on any presumptive list
Peripheral neuropathy after solvent exposure, a cancer that is not among the listed types for your exposure, a condition the science ties to your hazard but the regulations do not yet. The list has edges; medicine does not.
Your exposure has no presumption at all
Jet fuel, most industrial solvents, PFAS from firefighting foam, and many occupational exposures carry no presumptive conditions. Every claim from these exposures is a direct claim.
Your service misses a qualifying window
The right condition in the wrong years, or the right exposure in an unlisted location. The presumption fails on the calendar, but the medicine still holds, and a direct claim can still win.
You were already denied
A denial for lack of nexus is the most fixable denial there is. A supplemental claim with a well-reasoned medical opinion is new and relevant evidence, and it directly supplies the element the denial named.
The opinion has to be phrased to the VA's standard. The threshold is 50 percent probability, and examiners read for it.
Language that meets the bar
- “At least as likely as not caused by the veteran's exposure to airborne hazards during service” Meets the 50 percent threshold and names the exposure. The standard to aim for.
- “More likely than not a result of the veteran's documented solvent exposure” Exceeds 50 percent; stronger than the minimum.
Language that fails
- “May be related to toxic exposure in service” A possibility, not a probability. Below the standard.
- “Could be connected to burn pit smoke” The word could does not meet the 50 percent bar, and the opinion should name the specific exposure and mechanism.
The VA exam is not your opinion
If your claim involves a toxic exposure risk activity and the file is thin, 38 U.S.C. 1168 generally obligates the VA to order an exam and a medical opinion before deciding, though it can decline when it sees no indication of a link between the condition and the exposure. That exam is free, but it is also the VA's examiner and the VA's framing. An independent opinion in your file before that exam anchors the question the way your evidence supports.
What separates a letter the VA weighs from one it discards is specific: see what a nexus letter must include and who can write one.
Exposures, Service Eras, and the Conditions They Cause
The table below is the thirty-second orientation: the major exposures, who encountered them, whether presumptive conditions exist, and where to go deeper. Presumptive status is per condition, not per exposure, so an exposure with a list still produces off-list claims, and the spoke guides carry the full condition lists.
| Exposure | Typical service | Presumptive conditions? | Deep dive |
|---|---|---|---|
| Burn pits and airborne hazards | Gulf War and post-9/11: Iraq, Afghanistan, Southwest Asia | Yes, 20+ conditions under the PACT Act | Burn pits guide |
| Agent Orange | Vietnam era; also Korea DMZ and PACT-added locations such as Thailand | Yes, a long-standing list plus PACT additions | Agent Orange guide |
| Camp Lejeune water | 30 days at Lejeune or MCAS New River, Aug 1953 to Dec 1987 | Yes, eight conditions | Camp Lejeune guide |
| Gulf War illness | Southwest Asia theater, 1990 onward | Yes, undiagnosed illnesses and MUCMIs under 38 CFR 3.317 | Gulf War guide |
| AFFF firefighting foam (PFAS) | Firefighters, crash crews, and bases with foam use, all eras | No, direct claims only as of this writing | AFFF and PFAS guide |
| Jet fuel and JP-8 | Flight lines, fuel handlers, and maintainers, all eras | No, direct claims only | Jet fuel guide |
| Radiation | Atomic testing, Enewetak cleanup, reactor and submarine work | Yes, for defined radiation-risk activities | Radiation guide |
| Solvents and asbestos | Mechanics, shipboard ratings, and industrial trades, all eras | No for solvents; asbestos claims run direct with strong medical literature | Solvents and asbestos guide |
Health effects from these exposures rarely announce their origin. They surface as breathing problems that will not resolve, skin conditions, neuropathy, unexplained fatigue, hypertension, and cancers that appear decades after the exposure ended. If a condition is on your record and an exposure is in your history, it is worth checking the two against each other even if no one has connected them before.
Toxic exposure conditions also cascade. A service-connected respiratory disease can drive sleep problems; a cancer can leave depression or neuropathy behind after treatment. Those downstream conditions are claimable as secondary conditions, each addable to your combined rating.
If one condition led to another, see our guide to nexus letters for secondary conditions.
Not sure what your diagnosis falls under? Browse VA conditions by body system, including the respiratory, neurological, and endocrine conditions toxic exposure most often produces, such as type 2 diabetes from Agent Orange.
How to File a Toxic Exposure VA Claim, Step by Step
- 1Get the diagnosis on recordThe VA connects diagnoses, not symptoms. See a provider, get the condition named and documented, and get the objective testing that supports it (imaging, pulmonary function tests, biopsies, nerve studies, whatever the condition calls for).
- 2Document your exposureYour DD-214, duty stations, and military occupational specialty establish where you were and what you did. For presumptive-window exposures, service in the right place and period is enough. For everything else, performance reports, maintenance logs, deployment orders, and buddy statements fill in what the record does not say.
- 3Check the forkCondition on a presumptive list and service in the window: file with diagnosis plus service proof. Anything else: plan on medical evidence, and consider a nexus letter before you file rather than after a denial.
- 4File and attend the C&P examFile online at VA.gov, through a Veterans Service Organization, or by mail. The VA will usually schedule a compensation and pension exam; attend it, describe your worst days honestly, and bring nothing new, the file should already be complete.
- 5Read the decision and act on itA grant gets you a rating and an effective date, usually the date you filed. A denial tells you exactly what was missing, and for toxic exposure claims the missing piece is almost always the medical link, which a supplemental claim can fix.
Free help exists, use it for the right job
A Veterans Service Organization can file and track the claim for you at no cost. What a VSO cannot do is write medical evidence, so on the direct path, pair the free filing help with the medical opinion the claim actually turns on.
The Evidence That Wins Toxic Exposure Claims
Non-presumptive claims are won on paper. Three pillars hold the claim up, and the file should make each one undeniable before the VA ever sees it.
Check off what you already have. The verdict updates as you go.
0 of 6 in hand
Start with the diagnosis and your service records. Everything else builds on those two.
How Toxic Exposure Conditions Are Rated
There is no single toxic exposure rating. Once a condition is service-connected, it is rated under its own diagnostic code in the VA schedule: asthma and COPD under the respiratory codes, largely on pulmonary function results; cancers at 100 percent during active treatment and for six months after it ends, then re-rated on what remains; neuropathy per nerve and severity; hypertension on blood pressure readings. The cause of the condition stops mattering the moment it is connected; only severity drives the percentage.
Multiple connected conditions combine, and they do not simply add. The VA's combined ratings table merges each rating into a single percentage, which is why a cluster of moderate conditions from one exposure can out-rate a single serious one. It is also why claiming every condition your exposure produced, including the secondary ones, matters more than most veterans realize.
If Your Toxic Exposure Claim Was Denied
Denials of toxic exposure claims cluster around one sentence: no evidence of a link between the condition and service. That is not the VA saying your claim is wrong. It is the VA saying the file did not contain a medical opinion making the connection, and in many denied files, it genuinely did not.
The fix is a supplemental claim with new and relevant evidence, and a physician's nexus opinion is the textbook example. Claims denied before the PACT Act are also worth a second look: if your condition has since become presumptive, a supplemental claim can pick up the new basis.
For the full breakdown of why letters and claims get rejected and what to do about it, see can the VA reject a nexus letter.
Do You Need a Nexus Letter for Your Exposure Claim?
Three questions. Answer honestly and this tells you which path your claim is on and whether a medical opinion is likely to decide it.
Answer the question above to see your path.
This tool is general education about how the two claim paths work. It does not prepare or file anything, and the VA decides every claim on its own complete file.
Get the Free VA Toxic Exposure Screening
If you are enrolled in VA health care, you are entitled to a toxic exposure screening at no cost, with a follow-up at least every five years. A provider asks about your exposures, records them in your VA medical file, and connects you to follow-up care or registry exams where they apply.
Do it even if you feel fine. The screening timestamps your exposure history in the system years before any claim, and an exposure documented in your medical record long before you filed is far harder to question than one first mentioned on a claim form. Ask for it at any VA medical appointment or through your VA primary care team.
How Patriot Path Helps
Patriot Path physicians write nexus letters and independent medical opinions for the claims the presumptive lists leave behind: the off-list conditions, the no-presumption exposures, and the denials that came back for lack of a medical link. Every letter is built from your records, names the exposure and the mechanism, cites the literature, and states the opinion in the language the VA requires.
The first consultation is free, and it is an honest read: if your claim is presumptive and a letter would add nothing, we say so. If a letter can carry the claim, it is a flat $1,500, written by a licensed physician who reviews your complete file.
See our flat-rate pricing, the full scope of our nexus letter services, and how the process works.
Key Takeaways
- Toxic exposure claims run on one fork: presumptive conditions are conceded, everything else must be proven with medical evidence.
- The PACT Act expanded the lists dramatically, but it is still a list. Jet fuel, solvents, PFAS, and every off-list condition ride the direct path.
- A presumption of exposure is not a presumption of service connection. Off-list conditions need a nexus opinion even when the exposure is conceded.
- On the direct path, the nexus letter is usually the deciding document, and it must say at least as likely as not.
- Get the free VA toxic exposure screening now; it documents your exposure history before you ever need it.
- A denial for lack of nexus is fixable. A supplemental claim with a physician's opinion supplies exactly the evidence the denial said was missing.
Get an Honest Read on Your Exposure Claim
Your exposure was real, and your diagnosis is on paper. If your claim needs the medical link the VA will not supply, our physicians write the opinion that connects the two, and if it does not, we will tell you that for free.
Frequently Asked Questions
What qualifies as military toxic exposure?
Any harmful substance you encountered during service: burn pit smoke and other airborne hazards, contaminated drinking water, herbicides like Agent Orange, industrial solvents and jet fuel, asbestos, and radiation. If you breathed it, drank it, or handled it in service and a health condition followed, it can support a VA claim, whether or not it appears on a presumptive list.
What toxic exposure conditions does the VA presume are service-connected?
It depends on the exposure. Burn pits carry more than twenty PACT Act conditions, including asthma diagnosed after service, COPD, chronic sinusitis, and a wide set of cancers. Agent Orange has a long-standing list that now includes hypertension and MGUS. Camp Lejeune has eight conditions, and radiation and Gulf War service have their own lists. Each condition also requires service in that exposure's qualifying window.
Do I need a nexus letter for a toxic exposure claim?
Not if your condition is presumptive: on the list, with qualifying service, the VA concedes the connection. You likely do need one if your condition is off the list, your exposure has no presumption (jet fuel, most solvents, PFAS), your service misses the window, or you were already denied for lack of a link. On those direct claims the medical opinion is usually the deciding evidence.
What is the difference between a presumptive and a direct toxic exposure claim?
A presumptive claim skips the hardest element: the VA concedes the connection between the condition and service, so you only prove the diagnosis and the qualifying service. A direct claim under 38 CFR 3.303(d) requires you to prove all three elements: the diagnosis, the in-service exposure, and a medical link between them. Both are decided under the same benefit-of-the-doubt standard once the evidence is in.
Does the PACT Act cover every toxic exposure?
No. The PACT Act expanded presumptive conditions for burn pits and Agent Orange and made exposure itself easier to establish, but it is still a list. Jet fuel, most industrial solvents, and PFAS from firefighting foam carry no presumptive conditions as of this writing, and any condition not on a list still has to be proven with medical evidence, no matter the exposure.
What if my condition is not on a presumptive list?
You can still win, on the direct path. You need your diagnosis, proof of the exposure, and a physician's opinion that the condition is at least as likely as not connected to it. Under 38 U.S.C. 1168 the VA generally must obtain an exam and medical opinion for a thin toxic-exposure file, unless it finds no indication of a link, which is one more reason an independent opinion you control is the stronger play.
What evidence do I need for a toxic exposure VA claim?
Three pillars: a current diagnosis with objective testing behind it, exposure proof from your service records (DD-214, duty stations, MOS, deployment orders) plus the VA toxic exposure screening note, and, for non-presumptive claims, a medical nexus opinion in the at-least-as-likely-as-not language. Timelines, buddy statements, and continuous treatment records strengthen all three.
What is the VA toxic exposure screening and should I get one?
A free screening for every veteran enrolled in VA health care, repeated at least every five years, that records your exposure history in your VA medical file. Get it even if you feel fine: an exposure documented in your record years before a claim is far more persuasive than one first raised on a claim form, and the screening also routes you to registry exams and follow-up care.
My toxic exposure claim was denied. Is it worth appealing?
Usually, yes. Most toxic exposure denials say the same thing, no evidence of a link between the condition and service, and that specific gap is fixable with a supplemental claim carrying a physician's nexus opinion. If your condition became presumptive under the PACT Act after your denial, a supplemental claim can also pick up the new presumptive basis.
Related guides
- Nexus letters for VA disability claimsThe full overview, start to finish.
- What is a nexus letter?The primer, if these documents are new to you.
- What a nexus letter must includeThe elements the VA looks for in a defensible letter.
- Who can write a nexus letterWhich providers the VA takes seriously.
- Can the VA reject a nexus letter?Why letters fail and how to appeal a denial.
- Nexus letters for secondary conditionsWhen one service-connected condition causes another.
- Nexus letters vs DBQsTwo different documents with two different jobs.
- The nexus letter processHow a letter comes together, step by step.
Citations & References
- 38 U.S.C. 1119, Presumptions of toxic exposure (Cornell LII) https://www.law.cornell.edu/uscode/text/38/1119
- 38 U.S.C. 1168, Medical nexus examinations for toxic exposure risk activities (Cornell LII) https://www.law.cornell.edu/uscode/text/38/1168
- 38 U.S.C. 5107, Claimant responsibility and benefit of the doubt (Cornell LII) https://www.law.cornell.edu/uscode/text/38/5107
- 38 CFR 3.303, Principles relating to service connection, including direct connection under 3.303(d) (eCFR) https://www.ecfr.gov/current/title-38/chapter-I/part-3/subpart-A/subject-group-ECFR39056aee4e9ff13/section-3.303
- 38 CFR 3.307, Presumptive service connection for chronic, tropical, and exposure-related disease (eCFR) https://www.ecfr.gov/current/title-38/chapter-I/part-3/subpart-A/subject-group-ECFR39056aee4e9ff13/section-3.307
- 38 CFR 3.309, Disease subject to presumptive service connection (eCFR) https://www.ecfr.gov/current/title-38/chapter-I/part-3/subpart-A/subject-group-ECFR39056aee4e9ff13/section-3.309
- The PACT Act and your VA benefits (VA.gov) https://www.va.gov/resources/the-pact-act-and-your-va-benefits/
- Eligibility for VA disability: exposure to hazardous chemicals and materials (VA.gov) https://www.va.gov/disability/eligibility/hazardous-materials-exposure/
- Agent Orange exposure and VA disability compensation, including the presumptive condition list (VA.gov) https://www.va.gov/disability/eligibility/hazardous-materials-exposure/agent-orange/
- Exposure to burn pits and other specific environmental hazards (VA.gov) https://www.va.gov/disability/eligibility/hazardous-materials-exposure/specific-environmental-hazards/
- VA PACT Act performance dashboard and resources (VA.gov) https://www.va.gov/pact/
- Airborne hazards and burn pit exposures (VA Public Health) https://www.publichealth.va.gov/exposures/burnpits/
- Veterans Service Organizations directory (VA Office of General Counsel) https://www.benefits.va.gov/vso/
- National Academies: Assessment of the Department of Veterans Affairs Airborne Hazards and Open Burn Pit Registry (NASEM) https://nap.nationalacademies.org/read/25162/chapter/2