The current wave of state-level efficiency legislation represents a departure from the simple ratcheting down of consumption metrics. While lower flow rates and higher energy factors remain central, the bills pending in Arizona, Illinois, Massachusetts, Pennsylvania and Virginia reveal a more profound structural shift. The proposed legislation moves away from static statutory limits toward dynamic programmatic alignment, reclassifies commercial hospitality spaces, and potentially opens a new regulatory front on commercial mechanical equipment. For those seeking clarity, call us at Regulosity. Our team specializes in detailed and personalized assessments to help you navigate and engage with the complexities of the regulatory framework.

The divergence of "static" vs. "dynamic" standards

The most significant compliance fissure lies between states that codify specific metrics and those that adopt "dynamic" regulatory pointers. Arizona's HB 2548 represents the latter, introducing a "living standard" approach. Rather than hard-coding flow rates that risk obsolescence, Arizona proposes that by January 1, 2028, all plumbing fixtures would be WaterSense-labeled or meet WaterSense criteria. This effectively outsources the technical rulemaking to the United States Environmental Protection Agency (U.S. EPA).

For manufacturers, this move is complicated. It simplifies long-term compliance but removes the regulatory certainty. For commercial, healthcare, or industrial markets, there is no WaterSense specification for faucets, as the existing specification applies only to residential products. Additionally, WaterSense is a voluntary specification, so fewer products carry the WaterSense mark. As WaterSense specifications evolve, Arizona's state law may automatically tighten without additional legislative intervention.

Conversely, Illinois (HB1612/SB 1582) and Pennsylvania (HB 660/SB 424) retain the traditional "static" model. These bills explicitly propose technical metrics for inclusion in statute—such as the 1.28 gallons per flush (gpf) limit for water closets and the 0.5 gpf limit for urinals. To complicate matters in Pennsylvania, the current proposal states that metering faucets cannot exceed 0.20 gallons per cycle (gpc). While the "static model" may provide immediate clarity, it creates a risk of "statutory fossilization," in which state law may eventually lag behind voluntary market standards or federal updates, forcing manufacturers to manage a fragmented compliance framework between "state-compliant" and "market-leading" SKUs.

The hospitality "residential" reclassification

A critical nuance for mechanical, electrical and plumbing (MEP) specifiers appears in Arizona's definitions. Historically, hotel and motel guest room plumbing has often been regulated by commercial building and safety codes. Arizona HB 2548 explicitly amends the definition of "residential construction" or "residential dwelling" to include "the sleeping quarters of hotels and motels."

This proposed reclassification forces the hospitality sector to adopt residential-grade WaterSense efficiency standards. While commercial public restrooms (lobbies) remain under "public construction" definitions, the guest rooms — the primary source of water load in hospitality — must meet the stricter WaterSense residential criteria.

The commercial kitchen and landscaping expansion

The pending legislation aggressively targets commercial food service equipment, moving beyond the residential appliances that dominated previous regulatory cycles. Pennsylvania and Massachusetts are leading this expansion, treating commercial kitchens as high-impact efficiency targets.

Pennsylvania's legislation incorporates specific U.S. EPA Energy Star Product Specifications by version number. For example, commercial fryers must meet U.S. EPA Energy Star Version 2.0 criteria, and commercial steam cookers are bound to Version 1.2. Massachusetts similarly targets commercial ovens and dishwashers, referencing U.S. EPA Energy Star Version 3.0. This shift forces commercial kitchen specifiers and designers to prioritize rated equipment over legacy heavy-duty models that may lack certification.

Furthermore, regulation is expanding into outdoor and recreational systems. Illinois and Pennsylvania both introduced regulations for "spray sprinkler bodies" — the exterior shells of landscaping irrigation heads. These must now include integral pressure regulators and meet WaterSense specifications. This moves efficiency standards outside the building envelope, impacting landscape architecture and irrigation contracting.

Virginia's defensive "shadow" standard

Finally, Virginia's HB 672, as currently proposed, presents a unique "defensive" regulatory mechanism. Unlike the market-forcing standards of the other states, Virginia's bill acts as a backstop. It mandates that if the U.S. Department of Energy (U.S. DOE) removes any product categories from federal regulation, the state automatically adopts the federal standards as they existed on December 31, 2025.

This creates a "shadow regulation" for manufacturers. Even if a future federal administration deregulates appliance standards, the 2025 federal efficiency levels remain the legal floor in Virginia. This ensures that manufacturers cannot revert to less efficient technology in the Virginia market, regardless of federal shifts, effectively locking in the current technological baseline.

Conclusion

The landscape of state-level efficiency is transitioning from simple conservation targets to complex technical alignment. For the plumbing and mechanical industries, the challenge is no longer just meeting a specific flow rate or energy efficiency target. It involves navigating the reclassification of commercial spaces as residential, integrating more commercial kitchen equipment into compliance frameworks, and managing the divergence between states that point to dynamic federal programs (AZ) and those that codify static metrics (IL, PA).