The survey was based on responses from almost 7,200 respondents out of 26,000 surveys mailed. This survey, conducted in 1995 and 1996, was similar to those in New York and Los Angeles, with a score range of 1 to 5. Copies of the survey can be obtained from William P. McDonnell, Public Affairs and Conservation Division, Metropolitan Water District, P.O. Box 54153, Los Angeles, CA 90054-0153. In 1996 a survey of a group of professionals who run water efficiency programs was conducted. The survey also includes views about water-saving shower heads.
Total points depend on the rating provided by the respondent.
As noted above, not all of these products perform equally, and some specific toilet models may not be at all satisfactory for some people, particularly those who tend to use large amounts of toilet paper. Upgrading the performance standards to assure that every product will be satisfactory for everyone is one possibility, but that is certainly not the case today. If you are the owner or manager of an apartment building, don't agree to a toilet model without checking some installation references. Also, make sure you don't have any pre-existing venting or other plumbing problems which should be solved before toilets are replaced. Take a look at these surveys and use them as a general guide.