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California SB 253: Climate Corporate Data Accountability Act·Disclosure SB253-ASSURANCE

Third-party assurance

Guía práctica para preparar esta divulgación. Use esta ficha para identificar la información a preparar, verificar afirmaciones y organizar la evidencia de soporte. Para los requisitos exactos, consulte siempre la fuente oficial de CARB.

Pasaporte publicado

Revisión pendiente
··· En revisión Revisión editorial en curso Elaborado a partir de fuentes oficiales y de evidencia de informes publicados. Todavía no consta ninguna persona aprobadora, por lo que esta página no lleva firma. Úsela junto con la fuente oficial de CARB mientras dure esa revisión.

Norma

California SB 253: Climate Corporate Data Accountability Act

Disclosure SB253-ASSURANCE · 2026-initial-regulation-as-amended-sb219

En vigor

2023-10-07

Fuente oficial: Abrir ↗

Última revisión

Material formativo de LRA · No emitido ni avalado por CARB

Foco de la divulgación

This disclosure is about whether the organisation has had its greenhouse gas reporting checked by an independent third party, and what that review covered. In practice, the organisation should explain the assurance arrangement in a way that makes clear which emissions information was reviewed, how far through the business the review reached, and whether the check was limited to selected parts of the inventory or applied more broadly.

The practical focus is on coverage and credibility, not just the fact that assurance exists. A useful explanation should help a reader understand whether the assurance covered the organisation’s full operations or only certain entities, sites, or emissions scopes, and whether the review was designed to support confidence in the reported figures as a whole or only in a narrower subset.

Este material formativo de LRA apoya la preparación de la divulgación. Para los requisitos exactos, consulte siempre la fuente oficial de CARB.

Antes de empezar

Antes de empezar

Una breve lista de comprobación antes de preparar esta divulgación: marque cada punto a medida que lo resuelva.

Preparación

Información clave que preparar

Campo de preparación Qué recopilar Pista de evidencia Responsable
Scope 1 and 2 coverage State the assurance level applied to the emissions figures for direct emissions and purchased-energy emissions. Assurance statement or report, plus the final emissions schedule showing which scopes were covered. Sustainability reporting / Finance
Assurance caveats Capture any stated limits, exceptions, or reservations attached to the assurance work. Assurance report wording, including any qualifications, exclusions, or scope restrictions. Sustainability reporting / Legal
Assurance conclusion Record the provider’s overall conclusion on the assured information, using the exact outcome they reached. Signed assurance opinion or conclusion section from the provider’s report. Sustainability reporting / Finance
Assurance provider Identify the external party that carried out the assurance work and issued the statement. Engagement letter, provider letterhead, or signed assurance report naming the firm or practitioner. Procurement / Sustainability reporting
Scope 3 assurance status Show whether the value-chain emissions information was assured, and if so, the status or extent of that assurance. Assurance report and the Scope 3 inventory or disclosure table showing the assured portion. Sustainability reporting / Supply chain
Assurance method standard Name the assurance framework or method the provider used for the engagement. Assurance report, engagement terms, or provider methodology statement naming the standard applied. Sustainability reporting / Finance
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Cómo prepararlo

Start by pinning down what the assurance covers: identify the emissions areas, the level of assurance, and whether any separate treatment applies to Scope 3. Keep the scope statement aligned to the item you will report.
Confirm who carried out the work and what method they used. Record the external assurance provider and the assurance framework or approach named in the report, using the same source documents throughout.
Gather the supporting material behind the assurance result. This should include the evidence the provider relied on, plus the underlying records needed to support the stated level, status, and conclusion.
Prepare the disclosure text itself in clear business language. Set out the assurance level for Scope 1 and Scope 2, the conclusion reached, and any note on Scope 3 status, making sure each item matches the source evidence.
Add any caveats or boundaries that affect how the assurance should be read. If the provider set limits, exceptions, or qualifications, describe them plainly and keep them tied to the relevant part of the assurance statement.
Before finalising, check the disclosure against the official source and the provider’s report. Make sure the wording, figures, and narrative are consistent, and that nothing material has been omitted or changed in translation.

Solicitar los datos

Request the assurance pack from Finance

Traduzca la divulgación a una pregunta de negocio interna y adáptela después al lenguaje propio de su organización.

What third-party assurance evidence do we have for our Scope 1, Scope 2, and any Scope 3 emissions reporting, and who provided it?

Use your organisation’s own labels first, then map them to the reporting fields. For example, ask for the assurance letter, review note, or external verification pack in the terms your team already uses, rather than using framework wording in the request.

Solicitud débil

Please provide the third-party assurance evidence for the disclosure.

Por qué falla: This is too framework-led and vague. It does not tell the owner which reporting period, which emissions areas, which document type, or which caveats matter, so the response may be incomplete or hard to use.

Solicitud mejor

Please send the signed external assurance or verification document for [reporting period] covering our emissions reporting, plus the provider name, what parts of the inventory it covers, the conclusion, and any limitations or qualifications. Use your team’s usual document names and include the file link.

Plantilla de correo formal
Subject: Request for assurance evidence for emissions reporting

Hi [name],

We are preparing the disclosure pack for [reporting period]. Please send the latest external assurance or verification evidence covering our emissions reporting, including:
- the provider name;
- the emissions areas covered;
- the assurance statement or report;
- any limitations, qualifications, or exceptions noted by the provider; and
- the basis used in the provider’s conclusion.

Please also confirm the file location and the internal contact who can answer follow-up questions.

If there are multiple documents, please send the final signed version and any supporting notes we should keep on file.

Please adapt this to your organisation’s own terms and check the source material before sign-off.

Thanks,
[preparer name]
Versión corta para Teams / Slack
Hi [name] — could you send the latest external assurance/verification pack for [reporting period] for our emissions reporting? Please include the provider name, what it covers, any caveats, the conclusion, and the file link. Please use your team’s usual document names and check the source material before sign-off. Thanks.

Ejemplos sectoriales

Manufacturing

Contexto. A plant-based group has external review of its emissions inventory prepared by a specialist verifier.

Solicitud adaptada. Please send the latest verification report for [reporting period] covering plant fuel use, purchased electricity, and any other emissions areas reviewed, plus the verifier name, conclusion, and any limitations noted. Use the document name your team uses internally.

Ejemplo de respuesta. Verification report dated [date], verifier [name], covers Scope 1 and Scope 2 for all sites in the group, conclusion states [summary], with one limitation noted for [site]. File stored at [link].

Retail / Consumer Goods

Contexto. A multi-site business has assurance over group emissions data prepared through the sustainability reporting team.

Solicitud adaptada. Please share the external assurance pack for [reporting period] for the group emissions file, including the assurance statement, the provider, whether Scope 3 was included, and any exceptions or caveats. Please use the same file names your team already uses.

Ejemplo de respuesta. Assurance statement from [provider], dated [date], covers Scope 1 and Scope 2 and selected Scope 3 categories, conclusion [summary], with no material exceptions noted. Supporting files saved in [location].

Redacte su divulgación

Notas que convierten los datos en una divulgación

Plantillas formativas de LRA: adáptelas a su organización y consulte la fuente oficial antes de la aprobación.

Nota metodológica

State which emissions areas were reviewed, who carried out the external check, what assurance framework they used, and whether any limits or qualifications were attached to the review.

Nota de contexto

Explain what the assurance result means for readers by clarifying the level of confidence reached for the reported emissions data and whether Scope 3 was included or left outside the review.

Declaración sobre las variaciones

If the assurance outcome changed from the prior period, note whether the shift reflects a different review scope, a change in the external reviewer or framework, or the removal or addition of any qualifications.

Entrada del índice de contenidos

SB253-ASSURANCE Third-party assurance — [location / page] / [notes]

Centro de descargas

Herramientas y formularios de preparación

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Gratis · Miembros de la Community

Preparación para el aseguramiento

Para cada afirmación, compruebe la evidencia

Afirmación Riesgos Evidencia que comprobar
We obtained the public assurance pack for the emissions figures, and it names the external reviewer.The assurer checks whether the published pack is complete and whether the named reviewer can be matched to the engagement.Published assurance report; cover page or signature page showing the reviewer’s name; final public filing set.
For the year in question, we had the external review carried out at the required level for the first two emissions scopes.The assurer probes whether the engagement level actually matches the level expected for that reporting year, rather than a lower or different form of review.Engagement letter; assurance report wording on level applied; internal reporting calendar or compliance checklist for the year.
Where the review noted any caveats, we kept those points visible in the published material rather than summarising them away.The assurer checks whether any restrictions, exceptions, or caveats were fully carried through into the disclosure.Assurance report; redline of the public disclosure; management response or issue log showing how caveats were handled.
The assurance report we published includes the reviewer’s overall view and makes clear whether there were any caveats or not.The assurer probes whether the report states a conclusion and whether the presence or absence of caveats is unambiguous.Final assurance report; publication pack; sign-off memo confirming the report version released to the public.
We used an outside reviewer, not an in-house team, for the assurance work.The assurer checks whether the reviewer was genuinely external to the reporting entity and its connected entities.Provider contract; independence declaration; corporate relationship checks; conflict-of-interest records.
Before appointing the reviewer, we checked that they had relevant emissions-assurance experience and the capability to complete the work properly.The assurer probes whether the reviewer had the right competence, capacity, and practical ability for the engagement.Provider credentials; CVs or team biographies; proposal or tender documents; competence assessment notes.

Paquete de evidencia que preparar

Carencias habituales en los informes

The information is presented without a date or as-at point.
The scope or boundary of the statement is left undefined.
Key terms are used inconsistently across the report.
Material changes since the previous period are not disclosed.
Assertions are made without supporting detail or a source record.
Boilerplate is used that does not actually answer what is asked.

Carencias habituales

Errores que evitar al recopilar los datos

Wrong owner askedThe team chases the sustainability lead for assurance evidence when the audit, finance, or external provider team actually holds the working papers and sign-off trail.
Framework labels used too earlyPeople ask for the data in disclosure language instead of the organisation’s own process terms, so the source team cannot map the request to its normal records.
Scope not pinned downThe collector never states whether the check covers only Scope 1 and Scope 2 or also the Scope 3 status field, so different teams send different slices of data.
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Dónde suele hacer falta juicio profesional

What counts as the covered emissions set after a buy-in or saleIf the reporting boundary changed during the year, explain which sites, entities and activity data were included in the assurance work and how you dealt with any opening or closing-period changes.
Using different country methods for the same activityWhere local data systems or calculation methods differ across countries, state which approach was used for each location and why the final assurance view still gives a like-for-like picture.
Borderline cases for people, assets or operations near the boundaryFor items close to the inclusion line, set out the rule you used to include or leave them out and disclose any material judgement made by management or the assurer.
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Ejemplos

Ejemplos ilustrativos

Sintéticos, redactados por LRA: no proceden del informe de ninguna empresa ni del texto de ninguna norma.

Illustrative (synthetic) example — manufacturing

We have included this synthetic example to show how our group might describe external review of its climate data. For the year ended 31 December 2025, an independent assurance firm reviewed our Scope 1 and Scope 2 emissions at a limited level of assurance, using ISAE 3000 (Revised) together with ISAE 3410; the conclusion was that nothing came to the reviewer’s attention to suggest the figures were materially misstated. Scope 3 was not covered in the same review, and the report noted a few boundaries and estimation points that narrowed the work performed.

Illustrative only: this example shows how a reporter can explain who performed the review, what level of confidence was reached for direct and purchased-energy emissions, which framework was used, whether indirect value-chain emissions were included, and any caveats on scope or methods.

Illustrative (synthetic) example — transport and logistics

This synthetic example shows one way we might report our external check of emissions information. For 2025, an independent third party provided reasonable assurance over our Scope 1 and Scope 2 figures under ISAE 3000 (Revised), and the conclusion was positive with no material issues identified; however, the reviewer set out a few qualifications linked to data gaps at two sites and excluded Scope 3 from the engagement.

Illustrative only: this example demonstrates a different sector voice while still covering the reviewer, the confidence level for direct and purchased-energy emissions, the assurance framework, the outcome, the limits noted, and the fact that value-chain emissions were outside the review.

Informes de empresas

Cómo informan las empresas sobre SB253-ASSURANCE en la práctica

Ejemplos de práctica de reporte completa y parcial. Son análisis basados en evidencia, no plantillas exactas para copiar.

Informes reales publicados
Cargill
Food Production — Agricultural · United States · 2025
Abrir el informe →
Cargill’s 2025 Impact Report provides assurance specifically for Fiscal Year 2025 Scope 1 and Scope 2 market-based and location-based greenhouse gas (GHG) emissions, as stated on page 109. The assurance provider is identified as KPMG N.V., offering limited assurance on selected sustainability KPIs, though the report only partially details this on page 75. Notably, the report lacks a clear assurance opinion or conclusion, does not provide assurance status for Scope 3 emissions, and does not specify the assurance standard used, leaving these aspects unclear or missing.
Old Dominion Freight Line / ODFL
Ground Transportation — Trucking · United States · 2024
Abrir el informe →
Old Dominion Freight Line’s 2024 Sustainability Report includes assurance on its scope 1 and 2 greenhouse gas emissions reporting, as noted on page 6, with reference to a 2024 GHG Inventory Verification Opinion mentioned on page 23. The report also references alignment with the GHG Protocol Corporate Standard on page 19, though the assurance standard is not clearly disclosed. Notably, the report does not provide information on assurance limitations, the assurance provider, assurance opinion or conclusion, or the status of scope 3 emissions assurance.
Host Hotels & Resorts, Inc.
Real Estate · United States · 2025
Abrir el informe →
Host Hotels & Resorts, Inc.'s 2025 Corporate Responsibility Report includes verified data on Scope 1, Scope 2, and Scope 3 greenhouse gas emissions, with Scope 3 emissions specifically verified by AET, as noted on page 54. The report references assurance of its GHG emissions and environmental inventory data for the calendar year 2024, with related assurance statements found on pages 54-55 and 62. However, the report does not provide clear information on the assurance level, limitations, opinion, provider, or the specific assurance standard used, as these datapoints are either not found or unclear.

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Escenarios para trabajar

A reporting team has a signed assurance report for its Scope 1 and Scope 2 figures. The report names the external reviewer, states the level of review reached, and includes a conclusion, but the team is unsure whether to mention that the reviewer also noted a scope restriction on one site visit.

PWhat should the preparer decide to include when summarising the external review for this disclosure?
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An organisation has obtained external review for its direct emissions and purchased electricity data, but its Scope 3 work is still being checked internally and no outside review has started. The draft narrative currently says only that the wider value-chain figures are “under review”.

PHow should the preparer describe the position on Scope 3 assurance?
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A company engaged a specialist firm to review its emissions data, but the draft note does not say whether that firm was independent. The preparer argues that the firm’s name and report title are enough because the reviewer is well known in the market.

PWhat judgement should the preparer make about identifying the assurance provider?
Mostrar la respuesta modelo →

The assurance report says the emissions data were reviewed using a recognised assurance framework and gives a conclusion with a qualification about one data source. The sustainability team wants to shorten the disclosure by leaving out the framework name and the qualification because the conclusion is already “limited assurance”.

PWhat should the preparer do with the framework used and the qualification?
Mostrar la respuesta modelo →

Referencias del marco

Requisitos aplicables de California y divulgaciones relacionadas

Referencias disponibles del marco y divulgaciones cercanas relevantes para preparar este requisito.

California

SB253-ASSURANCE

dentro de California SB 253: Climate Corporate Data Accountability Act

Abrir la fuente oficial →

Relacionado y explorar

Más en California SB 253 → Ver el catálogo completo → Inicio de la Biblioteca de divulgaciones → Buscar en todas las divulgaciones →

Preguntas frecuentes

Preguntas que responde esta página

SB253-ASSURANCE: what should I gather before I start the disclosure draft and how do I use the page’s step-by-step preparation section?+
SB253-ASSURANCE: which data points does this page say I need to prepare for the disclosure?+
SB253-ASSURANCE: how do I decide who owns the data for this disclosure across sustainability, HR, finance or operations?+
SB253-ASSURANCE: what evidence pack do I need to make this assurance-ready?+
SB253-ASSURANCE: what are the six assurance claims to verify and how should I use them?+
SB253-ASSURANCE: what common reporting gaps or mistakes does the page warn about?+
SB253-ASSURANCE: how do I use the Prep & Assurance workbook and printable Library Card?+
SB253-ASSURANCE: does the page include an example disclosure I can copy into my draft?+
SB253-ASSURANCE: how can I turn the page content into a draft disclosure and content-index line?+
SB253-ASSURANCE: can I reuse data from this page for ESRS E1 (Climate Change)?+

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