Bay Area Water Heater Rule Raises Cost and Compliance Concerns for Distributors and Customers

ASA members in California should be aware of a proposed Bay Area Air Quality Management District (BAAQMD) rule that would significantly restrict the sale and installation of many natural gas-fired water heaters and boilers in the region. While the proposal is framed as an emissions-reduction measure, its practical effect could be higher costs, added paperwork, constrained product availability, and more complicated replacement decisions for distributors, contractors, property owners, and consumers.

The proposed Rule 9-6 would establish increasingly stringent nitrogen oxides (NOx) emissions limits for natural gas-fired water heaters and boilers, including standards that could move many common replacement products toward zero-NOx compliance over time. The rule would apply broadly across the supply chain, affecting manufacturers, sellers, distributors, installers, and contractors working in the Bay Area market.

Why this matters to members

For members, the concern is not simply whether lower emission technology can play a role in improving air quality. The concern is whether the rule is workable in the real world. Emergency replacements, older buildings, limited electrical capacity, small mechanical spaces, multifamily housing, restaurants, healthcare facilities, and affordable housing properties all present practical challenges that do not always fit neatly into a regulatory timeline.

The proposal includes exemptions for certain facilities and situations, including some high-demand businesses, low-income housing circumstances, electrical constraints, space constraints, temporary replacements, and specific multifamily or affordable housing applications. However, many of those exemptions require advance approval, certification, documentation, or address-specific exemption certificates. That means contractors and distributors may have to navigate additional administrative steps at the same time as customers are facing urgent service needs.  This proposed rule could influence other air quality districts within California, as well as future adoption by other states.

ASA advocacy priorities

ASA is focused on ensuring that any final rule recognizes market realities and protects members from unnecessary disruption. Policymakers should account for product availability, installation feasibility, customer affordability, contractor liability, distributor inventory impacts, and the need for clear, timely guidance before new requirements take effect. Compliance timelines should reflect actual product availability and workforce readiness, exemption pathways should be clear and fast enough for emergency replacements, and recordkeeping or certification requirements should not create unreasonable burdens for contractors, sellers, or distributors. Rules affecting affordability-sensitive customers, multifamily housing, restaurants, healthcare settings, and small businesses should include practical flexibility, and district guidance should be issued well before enforcement deadlines so members can train teams, update inventory practices, and communicate accurately with customers.

What members should do

Members operating in or supplying the Bay Area should begin reviewing how the proposed requirements could affect product lines, replacement practices, customer communications, and documentation systems. Companies should also identify common installation scenarios that may require exemptions or additional guidance, such as older buildings, constrained mechanical rooms, or customers unable to support electrification without major upgrades.

ASA will continue monitoring the rulemaking process and advocating for a balanced approach that improves environmental outcomes without imposing unrealistic costs or compliance obstacles on the supply chain. Members with examples of difficult installations, customer cost impacts, inventory challenges, or exemption concerns are encouraged to share that information so ASA can continue making the strongest possible case on behalf of the industry. If you have any questions or feedback on this issue, please contact ASA VP of Advocacy Steve Rossi at srossi@asa.net.  

By Steve Rossi