Small Systems Guide To Safe Drinking Water Act Regulations - U.s. Environmental Protection Agency - 2003 Page 6

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Why Compliance Is Important: Protecting
Public Health
Virtually every American consumes water from a
Non-Transient Non-Community Water
regulated “Public Water System,” either at home,
Systems (NTNCWS). A NTNCWS is a
work, school, or on the road. A Public Water
PWS that regularly supplies water to at
System (PWS) is any system serving 15 or more
least 25 of the same people at least six
connections or an average of 25 or more people per
months per year, but not to their
day for at least 60 days per year. Many PWSs are
residences. Examples include schools and
actually owned by private entities!
factories that have their own water supplies.
Public water systems fall into one of three
Transient Non-Community Water
subcategories:
Systems (TNCWS). A TNCWS is a PWS
that provides water in a place where people
do not remain for long periods of time.
Community Water Systems (CWS). A
CWS is a PWS that supplies water to the
Examples include restaurants, rest stops,
same residential population year-round.
and campgrounds that have their own water
Examples include cities, towns, rural water
supplies.
systems, manufactured home communities,
and home owner associations.
A Failure to Protect Public Health:
E. Coli Contamination at a New York
County Fair
In August 1999, an E. coli outbreak at the Washington
County Fair in New York led to hundreds of people
becoming ill and the deaths of a three-year old girl and an
elderly man. According to the New York Department of
Health, the likely cause of the outbreak was water
contamination caused by either septic system leakage or
manure runoff.
Source: State of New York Department of Health, “Health
Commissioner Releases E. coli Outbreak Report,” 3/31/
00. Available online,
nysdoh/commish/2000/ecoli.htm
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