What does CARB compliant mean on a generator? California rules explained

If you've shopped for a generator, you've seen "CARB compliant" or "50-state" on some listings and "not for sale in California" on others. Here's what it means, and what California's rules actually do and don't do.

We aren't lawyers. This is a plain-English summary of CARB's own pages, current as of October 2026. Rules can change, so check CARB's site before you buy.

What does CARB compliant mean?

CARB is the California Air Resources Board, the state's air-quality agency. Under the federal Clean Air Act, California can set its own emission limits for small engines, with U.S. EPA's authorization.

A CARB-compliant generator has an engine that CARB has certified to California's standards. CARB's FAQ says the rules "require equipment to be certified and labeled for sale in California."

• CARB compliant (sometimes "50-state"): certified for sale in California and the other states.
• EPA only (sometimes "49-state"): certified for the other 49 states, but not for sale in California.

Makers show it on the spec sheet. One maker's small inverter, for example, lists "CARB Compliant: No."

CARB compliance is about smog-forming emissions. It is not the same as carbon monoxide safety. For that, look for a CO shut-off feature. See our generator carbon monoxide safety guide.

What are the SORE rules?

SORE stands for small off-road engines. CARB's FAQ says the rules cover new spark-ignition engines of 25 horsepower or less. That includes lawn mowers, leaf blowers, pressure washers and portable generators, gas or propane.

The key dates:

When	What happened
December 2021	CARB approved amendments. Most small engines go to zero emissions first. Portable generators got a slower phase-in: tighter limits first, then zero from model year 2028.
January 1, 2023	The 2021 amendments became effective.
January 6, 2025	U.S. EPA granted CARB's authorization for the rules.
Model year 2026	CARB deferred full implementation to this model year.
By model year 2028	Emission standards for smog-forming emissions from new engines are set at zero.
Through 2032	CARB says makers may use emission reduction credits to certify engines.

Why generators? CARB says that in 2020, portable generators were 14% of all small off-road equipment in the state but produced 19% of its smog-forming emissions. It gave them more time because people depend on them in wildfire and wind outages.

Does 2028 mean no more gas generators in California?

Not quite.

From model year 2028, the standard for new engines is zero smog-forming emissions. But CARB's own FAQ says makers "may use emission reduction credits to certify engines through 2032." It also says the rules "do not ban gasoline-fueled engines and equipment."

So in practice:

• Stores may keep selling CARB-certified gas generators already in inventory.
• Makers can still certify some new gas models using credits, through 2032.
• Battery power stations aren't affected. CARB says makers of battery-electric equipment don't need SORE certification.
• Larger portable generators and stationary generators aren't covered, CARB says. Engines that run on diesel aren't covered either.

Can I still buy a gas generator in California?

Yes, for now. CARB's FAQ says gas engines and equipment have been certified for model years 2026 and 2027, and stores may sell existing CARB-certified inventory.

What's restricted is selling new units that aren't certified for California. The rules put that duty on makers, distributors and retailers.

There was one short exception. CARB says that when supply was short after the Los Angeles wildfires in early 2025, it let makers and sellers sell 49-state portable generators in California for six months.

Can I own or use a non-CARB generator in California?

CARB says the SORE rules don't have requirements for equipment owners. Its FAQ says residents can keep using, servicing and repairing their gas equipment for its useful life. No one has to replace a generator they already own.

Two cautions:

• Local rules can be stricter. CARB notes users are subject to any additional rules adopted by local governments.
• Buying new is where the rule bites. If you're in California, buy a CARB-compliant model from a seller who will ship it to you.

Could the rules change?

Possibly. CARB's FAQ says U.S. EPA sent the SORE authorization to Congress for review under the Congressional Review Act on June 12, 2026. We couldn't confirm the outcome of that review. Check CARB's SORE page for the latest before a big purchase.

Other states can't copy the SORE rules. CARB says federal rules stop them from adopting California's standards for small spark-ignition engines. So this is a California-only issue.

What should California buyers do?

1. Check the spec sheet for "CARB compliant: Yes."
2. Look for the California emissions label on the engine.
3. Think about a battery power station for light loads like a fridge, CPAP, lights and phones. See portable power station vs generator.
4. Look for a CO shut-off too. CARB compliance doesn't cover carbon monoxide safety.

Whatever you buy, a gas or propane generator must run outdoors only, at least 20 feet from your home. Read our generator carbon monoxide safety guide.