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How much water does a modern residential toilet typically discharge into the waste system per flush?

  1. 1.0 gpf

  2. 1.3 gpf

  3. 1.6 gpf

  4. 2.0 gpf

The correct answer is: 1.6 gpf

A modern residential toilet typically discharges about 1.6 gallons per flush (gpf) into the waste system. This standard became prevalent in the 1990s when regulations were established to reduce water usage and promote conservation. While earlier toilet models used significantly more water (up to 3.5 gpf or even more), the 1.6 gpf model represents a balance between effective waste removal and water efficiency. This figure applies to most toilets designed for residential use, reflecting advancements in flushing technology that allow for efficient waste removal with less water. The use of this standard not only aids in water conservation but also aligns with environmental policies aimed at reducing household water consumption. Thus, understanding the typical discharge rate helps home inspectors evaluate the plumbing efficiency and water usage of residential properties.