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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.

Annual Operating Periods & Populations Served

From the help published with Drinking Water Watch 3.5, reproduced as delivered.

Annual operating period indicates the period(s) of the year that the water system is in operation. The Annual Operating Periods & Populations Served display box indicates the Start Month, Start Day, End Month, End Day of the annual operating period of the public water system. It also displays the Population Type and the Population Served.
Some water systems serve seasonal populations, some serve only year-round populations, and others serve mixed populations and annual operating periods.
Annual operating periods have a starting month and day and an ending month and day and are effective for a number of years.
Display of Annual Operating Periods is limited to those with End Date is Null (not valued) or Less Than 1 Year from today.

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