What just moved
California’s Air Resources Board approved the initial climate disclosure regulation on February 26, 2026 and set August 10, 2026 as the first SB 253 reporting deadline for Scope 1 and Scope 2 data. That is the calendar pin companies will work toward this year. (CARB news release, 2026) (CARB news release, 2026)
Corporate rule, product ripple
SB 253 applies to entities with over 1 billion dollars in annual revenue that do business in California. It is corporate reporting, yet the heaviest lift often sits in purchased goods and services where buyers need supplier data that holds up to assurance and investor scrutiny. In many sectors, supply chain emissions dwarf operations, with companies reporting supply chain emissions an average of 26 times higher than Scopes 1 and 2 combined. That is why product‑level carbon is suddenly the star of the show. (CDP, 2024) (CDP, 2024)
What buyers will ask from manufacturers
Procurement teams will request supplier‑specific, cradle‑to‑gate numbers for key SKUs, plus clear system boundaries and allocation choices. Third‑party verified LCAs and EPDs give them defensible primary data for Scope 3 Category 1, which beats spend‑based estimates that can over or under shoot reality. The GHG Protocol encourages using supplier primary data where it is material to reductions and tracking performance over time. (GHG Protocol FAQ, 2025)
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Timing math you can use
CARB confirmed that first‑year SB 253 reports cover a company’s prior fiscal year for Scopes 1 and 2. CARB also signaled first‑year enforcement discretion for entities making good‑faith efforts, including use of data already being collected when the notice issued. This is not a hall pass to wait, it is a lane to get credible data organized now. (CARB Enforcement Notice, 2024) (CARB Enforcement Notice, 2024)
The EPD advantage in a Scope 3 world
An EPD is not required by SB 253, yet it is often the cleanest proof of product‑level carbon. When a buyer’s inventory depends on your bill of materials, metering, transport modes, and waste rates, a verified EPD gives them audit‑ready math and keeps your product in play when projects screen for carbon. That can shorten decision cycles and reduce the chance of a generic factor penalty landing on your SKU.
Fast track moves for manufacturers
- Prioritize top revenue or high‑spec SKUs for product LCAs first. Tie factory data to a clear reference year so updates are smooth.
- Align with the most common PCR your competitors use, then validate metering, production volumes, yield losses, and packaging so assurance goes quickly.
- Capture logistics reality now. Distances, modes, load factors, backhauls, and returned goods have outsized impact in cradle‑to‑gate.
Choosing the right LCA partner matters
Speed comes from ruthless data collection and tight project management inside your plants, not from tossing a spreadsheet over the wall. Look for teams that do the white‑glove wrangling with your operators, QA, purchasing, and EH&S so your engineers stay on core work. Ask for plan‑to‑publish timelines, operator agnosticism, and proof they can harmonize product LCAs into portfolio EPDs without rework.
The takeaway
SB 253 is corporate disclosure, yet it will definitly be won or lost on supplier product data. Manufacturers that turn their operational truth into verified EPDs this spring will be the easy button for customers racing toward August 10. That is how you stay specified when climate reporting meets procurement.
