Case type Product Liability
Herbicide & Weed Killer Exposure
Diagnosed with a serious illness after years of using or working around weed killers? Tell us your story.
Herbicides are regulated chemical by chemical, and the science is too. CBW Law starts by identifying the active ingredients you were exposed to, then reviews the research and litigation for each. Tell Us Your Story. Contacting us does not create an attorney-client relationship.
Weed killers are made from many different active ingredients, and each has its own research, regulation and litigation history. Glyphosate, paraquat and 2,4-D are regulated separately, and evidence about one cannot be applied to another. An herbicide lawyer starts by identifying the products and ingredients involved, then looks at how long and how you were exposed and what the research says about your diagnosis.
Start with the active ingredient
Weed killers are pesticides, and each product is registered by EPA based on its active ingredient and formulation. A registration is a license to market the product after EPA reviews data on its health and environmental effects1. Pesticide labels are legally enforceable: "the label is the law"1.
That is why the first question in any herbicide claim is which chemical was involved. Different herbicides have different hazards, different research and different legal histories:
| Active ingredient | What EPA's pages say |
|---|---|
| Glyphosate (in Roundup and many others) | Broad-spectrum herbicide; EPA's 2017 assessment did not identify cancer risks of concern, and EPA is updating its human health assessment, with completion expected in late 20262. |
| Paraquat (Gramoxone and others) | One of the most widely used herbicides; no homeowner uses; all products are restricted to certified applicators3. |
| 2,4-D | Used since the 1940s on lawns, crops and rights-of-way; toxicity depends on its chemical form; it is not Agent Orange4. |
We have dedicated pages for Paraquat and Roundup. Chlorpyrifos, which people sometimes group with weed killers, is an insecticide, not a herbicide; see Chlorpyrifos Exposure.
How exposure happens
- Mixing, loading and spraying on farms, golf courses or rights-of-way
- Landscaping and groundskeeping work
- Home lawn and garden use of products sold to consumers
- Drift from nearby spraying
- Contaminated clothing and equipment
How long someone was exposed, how (skin, breathing or swallowing), and what protective equipment was used can all matter when interpreting research and evaluating a claim.
Why research on one herbicide does not apply to another
Regulatory views can also differ from the views of other scientific bodies and from what juries have decided. EPA's position on glyphosate, for example, is under active review2.
Where herbicide litigation stands
Large herbicide litigations are organized by product. The federal Roundup cases are MDL No. 2741 and the paraquat cases are MDL No. 30045. In June 2026, the U.S. Supreme Court decided Monsanto Co. v. Durnell, which asked whether federal pesticide law preempts a state-law failure-to-warn claim based on the label when EPA has not required the warning. The Court reversed the Missouri judgment that had allowed the claim6. That decision affects label-based warning claims; its effect on other kinds of claims depends on the case. We cover it in more detail in our news article on the decision.
Who may have a claim
- The products used, with brand names and EPA registration numbers if known
- Where and how you used or were exposed to them, and for how long
- Your job duties and protective equipment
- Your diagnosis and its date
- Any prior filings in Roundup or paraquat litigation
Who may be responsible
- Herbicide manufacturers
- Distributors and sellers
- Employers or applicators, in limited circumstances
Filing deadlines for herbicide claims
Many herbicide illnesses are diagnosed years after exposure, so discovery rules often matter. Examples:
- Arizona: generally two years for personal injury and wrongful death7.
- California: two years for personal injury8, and for toxic exposure, two years from the injury or from when the person knew or should have known of the injury and its likely cause, whichever is later9.
- New York: three years, measured from discovery of the injury for the latent effects of exposure to a substance10.
- Texas: two years for personal injury11; the 15-year product limit has an exception for some latent diseases from exposure12.
These examples are not complete, and other rules can apply. A product liability attorney can check the rules for your state early.
Records that help
Records that can help
Exposure history
- Where you lived and worked, with dates
- Job titles, duties and employers
- Product names or labels, if known
- Pesticide applicator license or training records
- Spray logs or purchase records
Medical
- Diagnosis date and pathology reports
- Treating doctors and hospitals
- Family medical history, if known
Other
- Water bills or water system notices
- Union, military or training records
What happens after you contact CBW Law
How an herbicide review works
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You tell us your history
The products, the years and how you used them.
-
We identify the active ingredient
We match products to chemicals and the research on each.
-
We review the records
With your permission, we gather work and medical records.
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We explain what we see
We tell you plainly whether a claim may be possible and which deadlines apply.
Weed killers are not one chemical. The active ingredient decides the science, the history and the claim.
Plain English
Medical, Health & Insurance
Terms you may see in an herbicide case.
Pesticide terms
Health terms
- Non-Hodgkin lymphoma
- A cancer of the lymphatic system at issue in Roundup cases.
- Parkinson's disease
- A progressive nervous system disorder at issue in paraquat cases.
Claim terms
- Preemption
- When federal law displaces a state-law claim, the issue in Monsanto v. Durnell6.
- Failure to warn
- A claim that a product's label did not adequately warn of a risk.
Questions
Frequently asked weed killer questions
Short answers to the questions people ask first.
Why does the active ingredient matter?
Each herbicide has its own hazards, research and legal history. A claim depends on the specific chemical.
Can research on Roundup be used for another weed killer?
No. Research on glyphosate does not apply to paraquat, 2,4-D or other herbicides.
Is chlorpyrifos a weed killer?
No. Chlorpyrifos is an organophosphate insecticide13.
What did the Supreme Court decide in Monsanto v. Durnell?
It reversed a Missouri judgment on whether federal law preempts a label-based failure-to-warn claim where EPA did not require the warning6.
Can homeowners bring a weed killer lawsuit?
Possibly, depending on the product. Some herbicides, like paraquat, have no homeowner uses3.
What if I don't remember the brand?
Work history, suppliers and purchase records can help identify products.
How long do I have to file a weed killer lawsuit?
State discovery rules often apply, such as New York's for latent exposure10.
What does an herbicide attorney at CBW look at first?
The products and active ingredients, how and how long you were exposed, and your diagnosis.
How much does it cost to talk to a weed killer lawyer at CBW?
Telling us your story costs nothing, and contacting us does not create an attorney-client relationship.
Tell Us Your Story
Herbicide claims start with knowing exactly which products were used.
Tell us what happened. CBW Law will review your information and explain what we see. Submitting information does not establish an attorney-client relationship or guarantee representation.
Tell Us Your Story Call (800) 476-2416
This page is general information about herbicide exposure. It is not legal or medical advice and does not create an attorney-client relationship. Use of a herbicide, a diagnosis or a study association does not, by itself, establish causation or legal responsibility. Regulations, court decisions and deadlines change, and no outcome can be promised.
