California is phasing out paraquat, a fast-acting herbicide sprayed on crops across the country. The reason: after regulators asked the pesticide industry for evidence that the chemical is safe, the companies essentially walked away instead of providing data. That move tells you everything you need to know about what paraquat actually is, and why every state should pay attention.
According to EWG’s analysis, when California’s pesticide regulators asked for more safety information about paraquat in recent years, the manufacturers abandoned the state rather than comply. The pesticide industry’s own behavior was louder than any warning label: if you won’t show your work, the chemical probably isn’t safe.
Paraquat has a long history in American agriculture, but as California regulators now recognize, the risks outweigh the benefits. The chemical continues to be sprayed on grain, alfalfa, cotton, and other crops across the country, even as concerns about its safety grow.
California becomes the second state to formally phase out the chemical. That there’s a precedent matters: it means other regulators have already made the connection between missing safety data and the need for restriction. According to EWG, when regulators asked manufacturers to prove the herbicide was safe, the companies chose to abandon the market rather than comply.
Here’s what matters for farmers and rural communities outside California: the industry’s refusal to provide safety data isn’t unusual, and it’s a playbook. When companies resist transparency about their products, it’s often because the data doesn’t support continued use. California’s regulators saw the pattern and acted. Other states now have a clear signal to do the same.
The phaseout doesn’t happen overnight, but it does set a timeline and a standard. For farmers still using paraquat, or landowners whose neighbors spray it, the message is clear: regulators are moving toward restrictions. The question isn’t whether paraquat will become harder to access; it’s when your state will join the phase-out. States watching California’s move will face their own choice soon: let the industry keep using an herbicide it refuses to defend, or restrict it proactively.
This also intersects with broader soil and farmland health work already underway. The USDA has begun recognizing that agricultural chemicals leave lasting impacts on soil and groundwater, which is why agencies are funding PFAS remediation on contaminated farmland. Like other persistent soil contaminants, paraquat doesn’t just affect the current season, which is why regulators are starting to think long-term about what chemicals they allow in the first place. Soil stewardship work happening on family farms shows what’s possible when farmers take control of the inputs they use, and regulatory action like California’s phaseout can open space for that kind of innovation.
The paraquat story also connects to a larger pattern in agriculture: consolidation has given a handful of chemical makers immense power to decide what gets sprayed, and when they won’t be transparent about safety, farmers and communities downstream have few alternatives. That’s not a market problem, it’s a structural one.
California’s move isn’t about fear or activism; it’s about standard transparency. The pesticide makers had a chance to prove safety and chose not to. That absence of evidence, in a regulatory context, is evidence of absence. Farmers, farmworkers, and rural neighbors deserve to know what’s being sprayed on the land and what it means for soil health, water quality, and long-term farmland viability. When an industry won’t say, that’s the signal to ban it.
For states watching California, the lesson is practical: you don’t need decades of perfect science to restrict a pesticide once the manufacturer won’t show you the data. Transparency is the baseline. Regulatory power exists to protect the people who live and work on the land. When that power is used, it shifts what’s possible. When you don’t get transparency, that’s your answer.
