Region 1: EPA New England
Charles River Report Cards
Each year, EPA provides a detailed summary of the progress that has been accomplished, and what actions lay ahead as we continue our efforts to bring the lower Charles River to full ecological health.
2007 use e coli single sample number of 235 for swimming and a multiplier of 5 (=1175) for boating.
The general standards for the grade at the outset were as follows:
A: always meets standards
The way the numbers have been calculated depends on a gross level on the general descriptors.
The grade is then refined by looking at past years and seeing how the numbers stack up against those.
*Figures represent the percentage of time that state bacterial standards are met.