The Plumbing Efficiency Research Coalition (PERC) was formed on January 6, 2009 when five prominent organizations signed a historic Memorandum of Understanding (MOU). The MOU created a collaborative network to advance plumbing research initiatives pertaining to water efficiency. The signatories included the Alliance for Water Efficiency, the International Association of Plumbing and Mechanical Officials, the International Code Council, the Plumbing-Heating-Cooling Contractors—National Association, and the Plumbing Manufacturers International. The American Society of Plumbing Engineers joined PERC on February 22, 2011. The MOU identified four initial research projects:

  1. Drainline Carry Research on High-Efficiency Toilets
  2. Water Re-use Systems and Safe Application for Re-use Water
  3. Non-water Consuming Urinals
  4. Sizing of Water Efficient Plumbing Systems

PERC Needs Your Help!

The Plumbing Efficiency Research Coalition (PERC) is seeking information on commercial building drainline blockages attributed directly to the installation or retrofit of high efficiency toilets (1.28 gallons per flush or lower). Please click here to enter your name, contact information and a brief description of the installation in question. Please do not send photos or other attachments. A member of the PERC Technical Committee may contact you for additional information.

Thank you for helping to keep our plumbing systems working!

August, 2014 – The Plumbing Efficiency Research Coalition (PERC) has launched Phase 2 of its study on drainline transport, building upon the results of its successful Phase 1 Report “The Drainline Transport of solid Waste in Buildings”.

Read the Phase 2 Work Plan

The first project selected was the drainline transport of solid waste in buildings. This study has now been completed. Please click here for the report.