Do I Have to Report a Spill in California? | SpillSafe
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Emergency Guide

Do I Have to Report a Spill in California?

Reporting depends on the release. Cal OES states that significant releases or threatened releases of hazardous material require immediate notification. Use the official guidance below and contact the responsible agencies for your incident.

Important: Reporting rules depend on the material, the quantity, the location, and the receiving environment. This page is general orientation only. Confirm your obligations with the responding agency, your local CUPA, or Cal OES.

Source: Cal OES spill release reporting guidance, checked September 17, 2026. Calling SpillSafe does not replace required agency notification. This guide is general information, not a site-specific compliance determination.

Step by Step

  1. Call 911 for anything immediately dangerous

    Injury, fire, vapor, a release reaching a waterway or the public. Emergency notification comes before administrative reporting, always.

  2. Notify the California Office of Emergency Services

    For a significant release or threatened release, notify the Cal OES State Warning Center at (800) 852-7550 immediately, and the local Unified Program Agency or 911 as directed by the applicable requirements. Other notifications may also apply.

  3. Notify your local CUPA

    Certified Unified Program Agencies administer hazardous materials programs at the county or city level and are usually the agency you will work with on documentation and closure. In San Bernardino County this function sits with county fire hazardous materials. Other counties assign it differently.

  4. Understand that thresholds vary

    There is no single universal number. Reporting expectations depend on the substance, the quantity, whether it left containment, and where it went. A quantity that is not reportable on a contained shop floor can be reportable on a street heading toward a drain. When in doubt, report.

  5. Document from the first minute

    Time of release, material, estimated volume, actions taken, who was notified and when. Agencies ask for this, insurers ask for this, and it protects you.

  6. Complete the cleanup and closure properly

    Reporting is the beginning. Agencies want to see that the material was recovered, that impacted soil or surfaces were addressed, and that waste went to an approved facility with manifests. Documentation supports agency review; only the responsible agency can determine whether additional work is required.

SpillSafe Environmental works within EPA, OSHA, and California agency guidelines on every response, and handles the transport, manifesting, and disposal chain that closure requires.

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Common Questions

What is the California spill reporting number?

The Cal OES State Warning Center takes hazardous materials release reports at (800) 852-7550. For anything immediately dangerous, call 911 first.

What happens if I do not report?

If you are unsure whether a release is reportable, contact Cal OES or your local Unified Program Agency promptly. Do not delay required notification while arranging a cleanup contractor.

Does a small spill on my own property need reporting?

Private property and a small quantity do not by themselves settle reporting requirements. Ask the responsible agency about the material, containment and potential exposure in your incident.

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