Grass clippings or other yard waste smothers natural vegetation and can add excessive nutrients to the creek. When the yard waste decays it introduces high nutrient levels, which reduces oxygen levels in the water, harming aquatic life in the creek. The material can also float downstream, lodge against trees, and become a major obstruction to stormwater flows. Current State regulations prohibit the discharge, dumping or release of potential pollutants into watercourses. This includes grass clippings and yard waste.