The amount of engineering done to remove sewage from the Charles River should mean that fecal bacteria can’t find their way into the river.

And yet they do.

One possible culprit is Man’s Best Friend(s)–or at least how some canine companions throw “away” the pooch poop (down the storm drain? Yup!)

But catching the culprits is difficult. One way to explain why the fecal coliform continue to bloom may be a map like this one, showing where the dogs live. Perhaps the blooms down-stormwater pipe from a popular pooch park could be connected with the (ir-)responsible dog walkers?

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