Greenhouse Gas Emissions Verification


This page last modified February 9, 2012

The Regulation for the Mandatory Reporting of Greenhouse Gas Emissions requires the reporting and verification of greenhouse gas (GHG) emissions.  Beginning in 2010, for their 2009 reported emissions, reporting entities are required to have their GHG emissions verified.  In order to maintain their ARB accreditation, all verifiers must take ARB verifier training, and be re-accredited by April 2012.  Only the following ARB accredited verification bodies and verifiers may provide verification services.

List of Accredited Verification Bodies
List of Accredited Verifiers

ARB's Accreditation and Oversight

ARB has established and implemented a verification program to support GHG reporting.  Two primary components are an accreditation program for GHG verification bodies and verifiers; and a verifier performance oversight program to maintain consistency in verification services provided while attaining California’s high standards for performance.  Summary of ARB's Accreditation and Verification Oversight.


ARB’s Verifier Accreditation

ARB conducts training for individuals interested in being accredited as verifiers for ARB’s GHG reporting program.  The ARB accreditation program was developed using international best practices as laid out in ISO 14065, which is the standard to which greenhouse gas verifiers need to be accredited.  More about Accreditation.

ARB’s Verification Oversight and Audit Program

ARB is responsible for evaluating the verification services provided by ARB-accredited verification bodies and verifiers to ensure California's high quality standards are achieved.  ARB conducts random audits of verifiers, including observing verifications during a facility site visit, and reviewing the verification reports and sampling plans of each verification body.  More about Verification and Audits.

Regulation Changes

ARB has posted the final regulation for the Amendments to the Regulation for the Mandatory Reporting of Greenhouse Gas Emissions.  Materials are also posted for the Cap-and-Trade regulation, and EPA's GHG Reporting Rule.

Information for Verifiers

Questions regarding ARB accreditation and verification should be sent to ghgverify@arb.ca.gov.
Verifier Re-Accreditation Application
Verification Body Application
More information about verifier training can be found on our verifier training page.
Conflict of Interest / Notice of Verification Services (COI/NOVS) Form for 2012

Information for Emissions Data Reporters

Updated information regarding verifying 2011 data in 2012 will be provided here soon.
Updated FAQ (coming soon)
Updated Guidance (coming soon)



Archived Information
(from the previous 2007 Regulation)
Verification Fact Sheet
Frequently Asked Questions
Technical Guidance for Verifiers
COI/NOVS Form
Verification Opinion Form
Verification Schedule (annual vs triennial schedule)
List of Power Entity Docs

For questions regarding ARB's verifier accreditation or greenhouse gas verification process, please email ghgverify@arb.ca.gov.


preload