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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.
Days to Monitor per Month
From the help published with Drinking Water Watch 3.5, reproduced as delivered.
The Days to monitor per month field specifies the default number of days (to monitor) per month. If you enter 31, SDWIS/STATE would interpret that to mean every day of the month.