What chemical spilled in Dorris, California?

The chemical that spilled in Dorris, California, was Paraquat, a highly toxic herbicide also known as Gramoxone.

What actions were taken due to the Paraquat spill?

Shelter-in-place orders were issued, Highway 97 was closed, and residents were advised to keep windows and doors shut and turn off HVAC units.

Did the National Weather Service issue any warnings?

Yes, the National Weather Service issued a rare hazardous materials warning for the area impacted by the chemical spill.

Home / Disasters and Accidents / Toxic Spill Forces Shelter-in-Place in Northern California

Toxic Spill Forces Shelter-in-Place in Northern California

18 Mar

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Summary

A toxic herbicide, Paraquat, spilled in Dorris, California, requiring immediate action.
Shelter-in-place orders and Highway 97 closure were enacted due to the spill.
The National Weather Service issued a rare hazardous materials warning for the area.

Toxic Spill Forces Shelter-in-Place in Northern California

An urgent shelter-in-place warning was issued for Dorris, California, on Tuesday, March 18, 2026, following a significant spill of the highly toxic herbicide Paraquat. The chemical, known as Gramoxone, poses a severe inhalation and ingestion risk. Emergency services swiftly responded by closing Highway 97 and implementing strict shelter-in-place orders for specific zones within the city.

Residents were advised to seal their homes by closing windows and doors and disabling air conditioning units due to the airborne risk of the toxic substance. The Siskiyou County Sheriff's Department emphasized immediate 911 calls for anyone suspecting exposure. This critical situation prompted the National Weather Service in Medford, Oregon, to issue an unusual hazardous materials warning for the impacted area, highlighting the severity of the event.

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