Tordon, Grazon, or Other Picloram Herbicides Linked to Early-Onset Colon Cancer
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Have you been diagnosed with colon or rectal cancer?
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What the New Study Found
For decades, no one could explain why colorectal cancer rates were rising fastest among adults under 50, especially in rural Western and Plains states. Diet, smoking, and obesity didn't fit the geography. The largest increases were in Wyoming, Montana, the Dakotas, Idaho, Colorado, and West Texas — regions with comparatively low rates of those traditional risk factors.
In April 2026, researchers at the Vall d'Hebron Institute of Oncology in Barcelona, led by José A. Seoane, PhD, published the first peer-reviewed evidence that picloram exposure leaves a measurable epigenetic signature on the DNA of colon and rectal tumors. The signature was strongly associated with early-onset colorectal cancer — meaning cancer diagnosed before the age of 50 — in a discovery cohort and was replicated across nine independent cancer cohorts.
The researchers cross-referenced United States Geological Survey county-level data on picloram application against SEER cancer registries and found that counties with the highest picloram use intensity also had the highest early-onset colorectal cancer rates — a population-level dose-response that survived adjustment for sociodemographic factors and other pesticides.
This kind of triple-validated evidence is rare at the inception of any environmental health investigation. It is the strongest scientific foundation a colon cancer mass-tort opportunity has been built on in recent memory.
The Herbicide You May Not Know You Were Exposed To
Picloram was introduced commercially in 1963 by Dow Chemical under the brand name Tordon. Today the same active ingredient is sold by Corteva Agriscience — the publicly traded crop-protection company spun off from DowDuPont in 2019 — under product names including:
- Tordon 22K (rangeland and pasture)
- Tordon RTU (cut-stump and basal applications)
- Grazon P+D, Grazon Next HL, Grazon Extra
- Surmount
- ForeFront
Picloram is highly persistent in soil — its half-life often exceeds 200 days — and it is highly mobile, meaning it leaches into groundwater. The EPA has documented picloram contamination in groundwater across at least 14 states. Picloram is also notorious for surviving cattle digestion: it passes through livestock unchanged, contaminating manure and compost.
More than 60 percent of picloram used in the United States is applied to rangeland and pasture. The heaviest-use states are Texas, Montana, Wyoming, North Dakota, South Dakota, Oklahoma, Nebraska, Kansas, Colorado, and Idaho.
A Second Concern: Technical-grade picloram has historically contained hexachlorobenzene (HCB) as a manufacturing contaminant. HCB is itself classified by IARC as a Group 2B possible human carcinogen and is regulated as a Persistent Organic Pollutant under the Stockholm Convention.
Who Faces the Highest Risk of Exposure?
Based on documented use patterns and the new VHIO findings, the people most likely to have meaningful picloram exposure include:
- Working ranchers and ranch hands — anyone who has applied Tordon RTU, Tordon 22K, Grazon, or similar products on owned, leased, or family rangeland.
- Licensed commercial pesticide applicators — particularly those with five or more years of rangeland, pasture, right-of-way, or forestry application history.
- Utility right-of-way crews — workers who applied vegetation-control herbicides for power, pipeline, telecom, or rail companies.
- State DOT and county weed-control crews — workers who applied roadside vegetation control.
- U.S. Forest Service and BLM applicators — federal employees and contractors who applied picloram on public lands.
- Family members of applicators — spouses and children exposed via take-home contamination on work clothing, equipment, and vehicles.
- Rural residents on private wells — people who lived in counties with documented picloram-positive groundwater testing.
The Highest-Priority States:
- Tier 1 (Highest Use): Texas, Montana, Wyoming, North Dakota
- Tier 2 (Heavy Use): South Dakota, Oklahoma, Nebraska, Kansas
- Tier 3 (Moderate Use): Colorado, Idaho, Iowa, Minnesota, Missouri, Oregon, Utah, Washington
If you, your spouse, or your parent worked the land — or grew up on a ranch or near sprayed federal land — in any of these states and was later diagnosed with colon or rectal cancer, you may be eligible to participate in this litigation.
How Damages Are Calculated in Cases Like This
Because no two cases are identical, individual compensation depends on the stage of disease, the strength of the exposure history, the plaintiff's age and economic circumstances, and the venue where the case is filed. Settlement structures from comparable pesticide mass torts — including the Roundup litigation against Bayer and the Paraquat litigation against Syngenta — provide the closest benchmarks.
In comparable cases, settlements have included recovery for:
- Past and future medical expenses — surgery, chemotherapy, radiation, immunotherapy, biologics, hospital stays, and follow-up care, which for late-stage colorectal cancer can exceed $750,000 over a lifetime.
- Lost wages and lost earning capacity — particularly significant for plaintiffs diagnosed before age 50, where forensic economists routinely calculate present-value losses in the seven figures.
- Pain and suffering — including the physical pain of treatment, the emotional toll of a cancer diagnosis, and the disruption of family and personal life.
- Loss of consortium — for spouses and family members.
- Wrongful death damages — for surviving family members of plaintiffs who did not survive the disease.
- Punitive damages — where evidence establishes that the manufacturer knew or should have known of the risk and failed to warn.
*Settlements in the broader Roundup litigation have ranged from approximately $6,000 for low-exposure residential users up to $165,000+ for occupational applicators with severe disease, with billions paid in aggregate. Compensation in the picloram litigation will depend on the specific facts of each case. No specific amount is guaranteed.*
The Filing Window Is Open — But Not Forever
Every state imposes a statute of limitations that limits how long after a discovery of harm a person can file a claim. For most personal injury claims involving newly discovered scientific evidence, the clock starts when a reasonable person could have first connected the disease to the cause.
The April 21, 2026 publication in *Nature Medicine* is widely expected to serve as that triggering event for picloram-related colon cancer claims. Depending on the state, the filing window may be as short as two years from that date — meaning some claims may need to be filed by April 2028 to preserve the right to recover.
States with the shortest filing windows include Texas, Oklahoma, Kansas, Colorado, and Idaho.
Even if you are unsure whether your case qualifies, the time to find out is now. The legal teams organizing this litigation are working on contingency — meaning there is no cost to you to learn whether you qualify and no fee unless and until a recovery is obtained on your behalf.
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