Historical Data

Below is a link to an Excel file with raw data for the 2012 season. It includes bacteria and dissolved oxygen (DO) analysis for both rivers, along with a brief summary of bacteria standards for safe swimming in MA and NH. Thanks also to Nathan Raines, Maureen Hilton, Dave Mcdonald and Katrina Kipp of the EPA for providing the bacterial analysis for the Merrimack River.

Water Quality Data 2012