The Fact is NSF is for the consumer. Since 1944, NSF International, an
independent, not-for-profit organization, has been committed to making
the world a safer place for consumers. Explore the consumer website to
learn more about NSF, our programs and services, and the many ways we
help consumers Live saferŪ every day.
http://www.nsf.org/Certified/DWTU/
NSF walks a fine line as there are over 500 manufacturers of water
filters, that do not like each other! NSF has to tell the truth or they
would be sued for loss of business and misrepresentaion to the
consumers.
You mention the Government has some role in all of this. Well they do.
The EPA does not set protocol for driniking water systems. In fact
(they) refer consumers to the NSF.