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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.
Number of RT Negatives
From the help published with Drinking Water Watch 3.5, reproduced as delivered.
Number of RT Negatives
indicates how many of the routine (RT) samples collected during the specific
monitoring period were negative. Negative means that no Total Colifom
organisms were identified in the sample. If all the samples collected
during a specific monitoring period were negative, that indicates that
the water is considered safe relative to microbiological contamination
(like bacteria and viruses). To know whether all the samples collected
during a monitoring period were negative, look on this page and at individual
sample results (click on the link for TCR Sample Results in the menu bar
on the left) because positive samples are not indicated in a summary.
Only negative routine samples are indicated in a summary.