With the new, final certification system, EPA lays out the requirements for the process and procedures for the certification of all WaterSense labeled products, ensuring that only accredited bodies are licensed to certify them. This system took effect in April 2009, superseding an interim process in place since 2006. The criteria that plumbing fixtures must meet to earn the WaterSense label has not changed, and consumers and most manufacturers will not notice any difference in the certification process.