By 2025 the California Energy Commission will outlaw all gas appliances, including propane. All new buildings (Commercial & Residential) will be all electrical.
The desire of law is not defacto. Like pharmaceuticals & fireworks, replacement appliances will be right across the border.
Even if natural gas was a controlled substance, and every appliance & shipping container could be checked, a majority of existing appliances will suck gas from their pipes for another 50+ years.
Plenty of time for typical political tides in CA to see another republican Governator, who perhaps joins forces with conservatives in DC, to subsidize gas & coal-fired power generation, and tax renewables enough to drive prices higher than fossil fuels.
It gets better ... California homes with gas stoves are breathing levels of NOx that would be illegal outdoors while 1.7 million Californians are breathing levels of carbon monoxide that exceed outdoors levels !
Most likely from old pilot-lit appliances, which burn the candle 24/7, kept alive by the slum lords of the rental sector.
And then there's NOxious gas from occupants. If a pilot was lit under me, on any given day, I could beat the space shuttle to 80,000 feet