Bay Area moves to loosen first-of-its-kind gas water heater ban

The Bay Area Air District (BAAD) — one of 35 such districts that regulate air quality in California — may loosen a first-of-its-kind rule that would effectively phase out certain gas-powered water heaters. 

Catch up quick: In 2023, BAAD passed a proposal requiring that only zero NOx residential water heaters be sold or installed in the Bay Area after January 1, 2027, aimed at improving air quality.

• BAAD is the first regulatory body in the U.S. to enact “such a stringent requirement for existing construction,” according to Bradford White. 
• A December 2024 pre-implementation report, published by the district, found “positive signs for contractor availability and readiness,” however, it determined that “variations across the building stock” will result in “some challenging installation cases.”

What’s happening: Citing affordability and availability considerations, BAAD in October 2025 released a “concepts paper,” proposing amendments that would loosen the rule, allowing gas-fired water heaters with capacities under 35 gallons to remain on the market until at least 2031. 

• The proposed changes would also allow homeowners to be exempt from the zero NOx requirements if they experience space constraints, financial hardships, or other specified challenges. 
• BAAD has solicited comments from stakeholders and will vote on the amendments in the coming weeks or months. 

The big picture: The situation exemplifies a similar push-pull over the banning of natural gas home appliances happening across the U.S., as Homepros previously reported.  

• New York lawmakers had mandated all-electric appliances in most new construction beginning January 1, 2026, but have since delayed its implementation. 
• When Los Angeles’s air district this summer considered a similar water heater-related rule, the area’s top federal prosecutor threatened to sue. 
• Meanwhile, Massachusetts lawmakers are considering doubling the number of cities and towns allowed to ban fossil fuels in new construction, while other local governments in California and Colorado have eyed similar bans.