What is the maximum flow rate for a residential toilet under current standards?

The maximum flow rate for a residential toilet, as mandated by current standards set by the U.S. Environmental Protection Agency (EPA) and other regulatory bodies, is 1.28 gallons per flush. This standard, implemented as part of the Energy Policy Act of 1992, encourages the use of high-efficiency toilets (HETs) that use less water compared to older models, which could use up to 3.5 gallons or more per flush.

The move towards 1.28 gallons per flush aligns with sustainability goals, aiming to reduce water consumption in residential settings, thus contributing to environmental conservation and efficient resource use. This figure is now the benchmark for residential toilets, promoting advancements in toilet technology that ensure effective waste removal while conserving water.

Higher flow rates, such as those specified in the other choices, indicate older toilet models which do not meet the current efficiency standards, reinforcing the importance of adopting modern plumbing fixtures that comply with today's water-saving regulations.