Plumbing cross-connections, which are defined as actual or
potential connections between a potable and non-potable water supply,
constitute a serious public health hazard. There are numerous,
well-documented cases where cross-connections have been responsible
for contamination of drinking water, and have resulted in the spread
of disease. The problem is a dynamic one, because piping systems are
continually being installed, altered, or extended. Control of
cross-connections is possible, but only through thorough knowledge and
vigilance. Education is essential, for even those who are experienced
in piping installations fail to recognize cross-connection
possibilities and dangers. All municipalities with public water supply
systems should have cross-connection control programs. Those
responsible for institutional or private water supplies should also be
familiar with the dangers of cross-connections and should exercise
careful surveillance of their systems.
Cross-Connection
Fact Sheet
Cross-Connection
and Backflow Prevention Manual - WVBPH
Cross-Connection
and Backflow Control Manual - EPA
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National Drinking water standards can be found on the
EPA's Ground
Water and Drinking Water homepage.