Incident type
Chemical Spills — What They Mean and What to Do
What a chemical spill involves, the exposure and health concerns to be aware of, and the steps affected people can take afterward.
A chemical spill is an uncontrolled release of a hazardous substance — from a facility, a storage tank, a pipeline, or a vehicle in transit. The risk to people nearby depends on the substance, the amount, the weather, and how close they are.
Common exposure routes
People are most often exposed by breathing contaminated air, by skin contact, or by contact with contaminated water or surfaces. Symptoms vary widely by substance and can be immediate or delayed.
What to do
Follow official guidance first. If authorities issue a shelter-in-place or evacuation order, act on it. Document what you experienced — see our guide on documenting your exposure after an incident. If you're unsure whether your area was affected, you can check your area.
Authoritative references
For substance-specific health information, agencies such as the EPA, the CDC/ATSDR, and your state environmental regulator publish guidance. We cite the specific sources relevant to each incident on that incident's page.
Recent Chemical Spill incidents
Common questions
What should I do right after a nearby chemical spill?
Follow official instructions first — shelter-in-place or evacuation orders exist for a reason. If you can do so safely, move away from the source and upwind, limit outdoor air, and seek medical attention for any symptoms.
How do I know if I was exposed?
Exposure isn't always obvious. Note any symptoms and when they began, your location relative to the spill, and any odors or visible residue. A medical evaluation can document exposure and guide treatment.