Fertilizers, pesticides, and organic wastes are among the many common stormwater pollutants that can degrade water quality. Stormwater runoff from golf courses, parks, and recreational facilities have been found to contain high concentrations of organic wastes, fertilizers, pesticides, and soil. When these materials wash into local waters they poison fish and contaminate the water. Soil and dirt washed from the grounds can also harm aquatic life by clogging the gills of fish, blocking light transmission, lowering water temperatures, and inhibiting photosynthesis. Organics, such as grass clippings and leaves, can cause algae blooms and bacteria growth which degrades water quality.