Get the greywater just right, and you've got the whole package rightand that matters. Many people and organizations instinctively recognize that greywater is the ideal test case for the transition to a new way of regulating and building that is appropriate to a post-peak resource, mature civilization. The US Green Building Council, the City of Santa Barbara, CA, Oregon ReCode, and SLO Green Build are among those organizations which independently chose greywater standards as the technology with which to launch their programs of regulatory reform. Is greywater reuse safe? Yes. There are eight million greywater systems in the US with 22 million users. In 60 years, there has been one billion system user-years of exposure, yet there has not been one documented case of greywater transmitted illness.