Verified emissions reporting required for SB 253

SB 253 reporting, solved.

Arbor's platform delivers automated calculations and audit-ready data to help you comply with California regulators and avoid penalties.

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SB 253 Overview What you need to know

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California SB 253

California's Climate Corporate Data Accountability Act (SB 253)

requires large companies to publicly disclose their greenhouse gas (GHG) footprint. The regulation is managed by the California Air Resources Board (CARB).

Requirements

Annual disclosure of Scope 1, 2, and 3 GHG emissions, aligned with the GHG Protocol.

Third-Party Assurance

Who it impacts

Over $1 billion in annual revenue

Doing business in California

CARB’s initial concept aligns with the state tax code, generally applying to companies organized in California or those exceeding specific thresholds for in-state sales (>735k ), property, or payroll (>735k), property, or payroll(>73k). This definition is not yet final and is under public review before being finalized.
See the full definition

Public and private companies

$500,000 annual penalty

with a safe harbor for good-faith Scope 3 reporting

Timeline

2026

Report Scope 1 and 2 emissions (for FY2025)

2027

Report Scope 3 emissions (for FY2026)

2030

Report Scope 1 and 2 Scope 1 and 2 assurance level increases from “limited” to "reasonable."(for FY2025)

SB 253 Solution The complete solution
for SB 253 reporting

Arbor provides the platform and expertise to meet every SB 253 disclosure requirement.

Audit-ready emissions calculations

Built-in expert guidance

Faster third-party assurance

Easy data integration

SB 253 Compliance SB 253 compliance in 3 steps

Get up to speed on California’s new climate disclosure laws with our expert guides and tools.

Step 1 Unify your data

Upload information in any format from existing systems or connect directly via API for seamless data integration.

Step 2 Automate carbon footprint

Calculate your complete Scope 1, 2, and 3 emissions, fully compliant with GHG Protocol standards.

Step 3 Prepare & report

Review your results with audit-ready documentation, and export your data in a disclosure-ready format.

What Arbor's customers have to say

Hopewell

Arbor's cutting-edge Carbon Management Platform provides a quick and easy solution to sustainable procurement. We are now able to make more informed supplier decisions, ensuring that we are not only prioritizing quality and cost, but also the environmental impact of our supply chains.

Hopewell
Hopewell
Hopewell.com
Hopewell
Hopewell.com
Scott Sports

Aide énormément nos équipes de produits et de conception.

André Goodman
André Goodman
Responsable de la RSE/du développement durable
André Goodman
Responsable de la RSE/du développement durable
Jermyn Street Design

It was so easy to use, the results came through quickly, and it provided exactly the information Jermyn Street Design was looking for. The platform's clear and concise layout made it easy to navigate, allowing me to calculate product carbon emissions for a key client within minutes.

Lisa Cunningham-Sherret
Lisa Cunningham-Sherret
Environmental, Social, Governance Specialist
Lisa Cunningham-Sherret
Environmental, Social, Governance Specialist
Vogue Business

Arbor is applauded for being more thorough and transparent than its predecessor data platforms.

Rachel Cernansky
Rachel Cernansky
Senior sustainability editor
Rachel Cernansky
Senior sustainability editor
Varner

With a focus on accuracy and efficiency, Arbor's software streamlines impact assessment, making it easier and faster for businesses to understand and decrease their carbon footprint.

Varner A.S.
Varner A.S.
Varner.com
Varner A.S.
Varner.com
Cambium Global

Pour gérer et réduire efficacement leurs émissions, les entreprises ont besoin de données précises, granulaires et utiles à la prise de décisions. Les outils et les modèles tels que ceux développés par Arbor sont essentiels pour fournir ces informations aux entreprises.

David Carlin
David Carlin
Responsable des risques, Initiative financière du Programme des Nations Unies pour l'environnement (UNEP FI)
David Carlin
Responsable des risques, Initiative financière du Programme des Nations Unies pour l'environnement (UNEP FI)
WINQS Sports

Amazing app and great service. We are a sustainability-focused sports brand and were looking for a CO2 calculation platform like this for a very long time. So far, no difficulties, rock on!

Jan Kratochvil
Jan Kratochvil
CEO & Co-founder
Jan Kratochvil
CEO & Co-founder
Nudnik

Teaming up with Arbor has been a game-changer for our brand! By showing the environmental footprint of our products, we've cranked up the trust factor with our customers and our conversion rates have skyrocketed by a whopping 28%!

Lindsay Lorusso
Lindsay Lorusso
CEO & Co-founder
Lindsay Lorusso
CEO & Co-founder
Conception d'arrière-plan de la comptabilité du carbone d'Arbor

SB 253 vs SB 261 A unified strategy for
California climate disclosures

By using your SB 253 emissions data as a foundation for your SB 261 risk report, you ensure data alignment, eliminate duplicate work, and maximize compliance confidence with a single, trusted partner.
Regulation

SB 253

Climate Corporate Data Accountability Act

SB 261

Climate-Related Financial Risk Act
Applies to
Organizations with $1b+ revenue operating in California*
Organizations with $500m+ revenue operating in California*
Reporting frequency
Annually
Every two years
Third-party verification?
Required for emissions data
Not required, but organizations must follow disclosure frameworks
Regulator
California Air Resources Board (CARB)
California Air Resources Board (CARB)
Penalties
Up to $500,000 USD per year
Up to $50,000 USD per year
Talk to our team

Have questions?

Our carbon experts are ready to help.
Danny, William, Jordan from Arbor

Frequently Asked Questions about SB 253

What is the SB 253 requirement?

What is the SB 253 threshold in California?

What’s the definition of “doing business in California?”

Is third-party assurance required for SB 253?

What’s the difference between SB 253 and SB 261?

What does "good-faith effort" mean for Scope 3 reporting?

What will CARB do with the data companies file?

SB 253 Reporting Ready to disclose?
Arbor makes it easy.

Let us help you meet California’s emissions disclosure requirements with clarity and confidence.