Draft of WaterSense Specification for Tank-Type Toilets Open for Comments

The Environmental Protection Agency has released the draft Version 2.0 of the WaterSense Specification for Tank-Type Toilets. Within the draft specification, EPA modified the water efficiency criteria for dual-flush toilets by eliminating the effective flush volume calculation and instead establishing a singular maximum flush volume requirement for both single-flush toilets and the full-flush mode of dual-flush toilets.

Additionally, EPA improved the readability throughout the specification by simplifying language, aligning language to maintain consistency with similar WaterSense specifications, and consolidating referenced ASME standards to avoid redundancy. EPA also incorporated clarifications that have been made to the specification since its original publication.

The revisions included in the draft specification constitute a major revision, as they will affect the certification status of some WaterSense labeled dual-flush toilets. Please refer to Section III of the Summary of Revisions (“Timeline for Compliance With Version 2.0 of the Specification”) to learn more about how the revisions will affect certification status and when EPA expects compliance.

EPA invites interested parties to provide written comments or materials relevant to the draft Version 2.0 of the WaterSense Specification for Tank-Type Toilets. Comments or suggestions may be sent to watersense-products@erg.com no later than Feb. 23. For more details, visit epa.gov/watersense/residential-toilets.