See the tiny balls of white stuff next to the edge of the turf grass? Those re pellets of chemical fertilizer spilled on the impervious surface of the sidewalk by the fertilizer applicator. The first rain event that comes long, in turn, washes these pollutants into the nearest storm drain. From there, they travel (along with a lot of other gunk) into the watershed's principal receiving streams and lakes. In this case, that's Lake Champlain. No wonder the lake's water quality is worsening -- all in the name of the great all-American lawn.