Wading into the clear water of the Magaguadavic River within sight of downtown St. George, Kalen Mawer notes all the signs of life: aquatic plants, mussel shells, tiny fish scattering with each splashing step. "That's a good thing," said Mawer, the aquatic science program manager at Eastern Charlotte Waterways. "If you get in and you're not seeing anything, then it's a bad sign." Mawer dips a plastic bottle into the river and carefully labels it with a Sharpie. She's out in hip waders near the Day Adventure Centre, collecting water samples to be tested for coliform and E. coli.