Streamline SB-253 and SB-261 compliance

Streamline your SB-253 & SB-261 compliance

Confidently report emissions and climate risk according to California’s climate laws in a fraction of the time & effort when compared to manual alternatives

What are the updates to SB 253 & SB 261?

As of July 2025, CARB has confirmed key details for California’s new climate disclosure laws. SB 253, also known as the Climate Corporate Data Accountability Act, was signed into law on October 7, 2023. It requires companies that “do business in California” with revenues over $1 billion to disclose both their operational (Scope 1 & 2) and supply chain (Scope 3) greenhouse gas emissions.

Together with SB 261, which requires companies with revenues over $500 million to disclose their climate-related financial risks, these are the first mandatory climate disclosure laws in the U.S. CARB’s latest updates confirm annual fees, strict reporting deadlines in 2026, and penalties up to $500,000 per year for non-compliance.
The clock is ticking and preparation starts now.

LinkedIn Carousel - SB253/261 by Yunji Hwang

Join the 280+ companies already using Carbonhound

"Our largest client announced that they would require all of their suppliers to disclose to the CDP - if we didn't make a change, our business was at risk. We needed a climate solution ASAP. With Carbonhound's efficient data automations and comprehensive onboarding support, we went from not tracking our footprint to ready to submit our disclosure in just three weeks."

Kate Bate

Co-Founder + COO

Automate your emissions reporting for SB-253

Carbonhound simplifies SB-253 compliance and works in lockstep with industry-specific experts to cover SB-261 requirements.

We deliver a unified report to meet regulatory needs. Two expert solutions, one comprehensive outcome.

For Supply Chain Businesses

Respond to customer requests to protect your biggest accounts

Don’t get caught flat-footed and win more deals with regulated businesses.

Carbonhound benefits:

Win more points on RFPs and differentiate from competitors
Save thousands in consulting costs
No in-house climate expertise needed
Repurpose your data for other voluntary or regulatory reporting requests like CDP, Ecovadis, B Corp, etc.

For Directly Regulated Businesses

Generate Scope 1, 2, and 3 reports in 4-6 weeks

Save $20,000+ and automate all of your emissions data.

Carbonhound benefits:

Connect raw data sources directly to the platform for real-time and efficient reporting
Stay out of spreadsheets and let us do the data QA, management, and formatting
Feel confident with third-party verified calculations and methodologies
Let us handle supplier engagement and Scope 3 coverage

The path to compliance

Carbonhound automates data entry, saving you weeks or months on time to report – but how long does the typical path to reporting take?

BASELINE

Measure your operational footprint and estimate supply chain emissions

4-6 weeks

We integrate with 1000’s of data providers such as utilities and hydro to automate your data collection and measure the emissions from your operations. Then, we can estimate the emissions from your supply chain to give you the big picture.

CLIMATE-RELATED FINANCIAL RISKS

Work with experts to identify climate-related financial risks

4-6 weeks

Through data from your baseline and in-depth conversations to better understand your business, our consulting partners will assess the climate-related financial risks to your business.

IDENTIFY, REFINE + REPORT

Assess opportunities, risks, and generate reports

Ongoing

We’ll help you understand the quantitative and qualitative climate data and deliver a unified, regulations-ready report. Then, it’s time to refine your data for next year and reduce your impact!