Written by IAPMO 5:41 pm Industry News

U.S. EPA Issuing Technical Clarifications for Product and Home Specifications

The U.S. Environmental Protection Agency’s WaterSense® program is issuing technical clarifications related to its specifications for homes, spray sprinkler bodies, and soil moisture-based irrigation controllers. New clarifications, indicated by their identification number, address:

  • HO-1223-1: Guidance and alternatives for conducting the dye tablet leak test for in-wall carrier toilet systems to meet the WaterSense Specification for Homes.
  • SB-1223-1: Updates to the American Society of Agricultural and Biological Engineers (ASABE) and International Code Council (ICC) standard that is referenced throughout the WaterSense Specification for Spray Sprinkler Bodies.
  • SM-1223-1: Required consistency in the directionality of the slope between soil moisture sensor readings at different water depletion levels in accordance with the WaterSense Specification for Soil Moisture-Based Irrigation Controllers.

These changes have been incorporated into the Compendium of WaterSense Product Specification, Certification, and Labeling Clarifications. As a reminder, builders, verifiers, home certification organizations, manufacturers, and licensed certifying bodies, as applicable, must adhere to these clarifications when certifying homes or products to meet relevant WaterSense specifications.

If you have any questions, please contact the WaterSense Helpline at (866) WTR-SENS (987-7367) or watersense@epa.gov.


IAPMO develops and publishes the Uniform Plumbing Code®,the most widely recognized code of practice used by the plumbing industry worldwide; Uniform Mechanical Code®; Uniform Swimming Pool, Spa and Hot Tub Code®; and Uniform Solar Energy, Hydronics and Geothermal Code — the only plumbing, mechanical, solar energy and swimming pool codes designated by ANSI as American National Standards — and the Water Efficiency Standard (WE-Stand)™. IAPMO works with government, contractors, labor force, and manufacturers to produce product standards, technical manuals, personnel certification/educational programs and additional resources in order to meet the ever-evolving demands of the industry in protecting public health and safety.

Last modified: December 8, 2023