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Why would a current CCR contain results from a previous calendar year?

The reason for the report containing results from the previous year is based on the sampling requirements from the Colorado Department of Health and Environment (CDPHE), along with the Environmental Protection Agency (EPA). Some of those sampling requirements occur each month and others occur at different times of the year based on water usage and when a contaminate may be more likely to be found in the water. So in order to provide a complete CCR report for the entire year, along with providing sufficient time for the public water systems to prepare the report, the CDPHE allows six months for the water provider to prepare and distribute the report to its customers.