Firms that publicly describe GHG assurance or verification services relevant to SB 253. Each entry summarizes what the firm's own website says, with a link to check it. We do not rate firms or publish prices.
CPA firm · AICPA attestation · Focus: Insurers
Provides limited assurance on Scope 1 and 2 emissions reports for insurance companies covered by SB 253. It does not calculate emissions itself.
Provider source page · Last checked 2026-10-16
CPA firm · AICPA AT-C 105/210 · Focus: General
Provides limited assurance reviews for SB 253 under AICPA attestation standards, plus SB 261 consulting.
Provider source page · Last checked 2026-10-16
Verification body · ISO 14064-3 · Focus: General
Offers independent emissions verification to the ISO 14064-3 standard, to help companies comply with California law.
Provider source page · Last checked 2026-10-16
Verification body · ISO 14064-3, ISO 14065 (ANAB) · Focus: General
An independent emissions verification body, accredited by ANAB under ISO 14065.
Provider source page · Last checked 2026-10-16
Verification body · ISO 14064-3, ISSA 5000, AA1000AS · Focus: General
Offers emissions verification and assurance under ISO 14064-3, ISSA 5000 and AA1000AS. It is also accredited by CARB to verify emissions reports.
Provider source page · Last checked 2026-10-16
Verification body · ISO 14064 · Focus: General
Publishes an SB 253 and SB 261 white paper and offers emissions accounting, climate-risk reporting and assurance services.
Provider source page · Last checked 2026-10-16
Inclusion is not endorsement. Verify accreditation directly, e.g. via the ANAB accreditation directory. Firms: request a correction or listing.
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