Water Quality Quogue August 27, 2012 Dear David, In response to Matthew Sprung’s Aug. 16 article “Algal Tides Threaten Local Waters,” I offer the following: Nitrogen and phosphorus pollution is the leading cause of water-quality impairments in the United States. With the thousands of residences existing within our region’s watersheds, the collective nitrogen loadings add up. Our bays were once known for clear waters, vast underwater eelgrass meadows, and abundant shellfish harvests.