California SB 253 (Scope 3 emissions)
Indirectly, and that is the part people miss. SB 253 makes large companies doing business in California report Scope 3 emissions, which are their suppliers' emissions. You feel it as a customer questionnaire you must answer with real numbers, even though the law never names you.
What the rule requires
Large companies doing business in California.
Who it catches
Large companies in CA - and every supplier their procurement sends an emissions form to.
How to check whether you comply
Read it yourself
We would rather you checked us than took our word for it. This links to the law as published, not to our summary of it.
We have a longer piece on this: scope 3 supplier questionnaire.
Questions people ask
Does California SB 253 apply to a Canadian supplier?
Indirectly, and that is the part people miss. SB 253 makes large companies doing business in California report Scope 3 emissions, which are their suppliers' emissions. You feel it as a customer questionnaire you must answer with real numbers, even though the law never names you.
Who does California SB 253 (Scope 3 emissions) apply to?
Large companies in CA - and every supplier their procurement sends an emissions form to.
How do I check whether we comply with California SB 253 (Scope 3 emissions)?
Has a big customer sent you a Scope 3 / emissions questionnaire? That is the trigger. Map which of your inputs they are asking about. You can also run our free website check, which tests 25 technical items in about twenty seconds, or book a review if this rule needs a documented answer.
Other rules that catch the same businesses
Find out which of the 33 apply to you
The fine risk check asks a few questions about your business and tells you which rules catch you, with the deadlines. Nothing you tick leaves your browser.
Check my fine riskThis page summarises a legal obligation in plain language so you can work out whether it applies to you. It is not legal advice, and the primary source linked above governs. Last reviewed 2026-10-03.