“CARB’s SB 253 submission form has 6 sections, dozens of data fields, and a third-party assurance requirement — and most US companies with over $1 billion in annual revenue have never filed anything like it. With an August 10, 2026 deadline, there’s little room to figure it out as you go.
This booklet walks through every section of the form, from organizational boundary definitions and emissions disclosure to calculation methodology and verification timelines, and flags the specific points where companies most commonly run into trouble.
Download the SB 253 Submission Form Decoded booklet to understand what CARB is asking for in each section, what data you need to have ready before you start, and where the most common filing mistakes happen.”
