I am looking for comments and references to sampling water across a
municiple water distribution system.
In order to determine the source of infections, it is suggested to
sample points across the distribution system and store them from some
time. If an outbreak of a disease occurs, the samples may then be
tested to see if water distribution system contributed to the spread
and how. (Regular testing all samples is usually considered too
expensive as the occurance is believed to be so low.)
How long can a sample be considered viable for testing if sealed in a
bottle and shelved? Is refrigeration or freezing more appropriate?
Are there standards for such sampling and holding?