Fertilizers contain large amounts of nitrogen and phosphorus- primary nutrients for algae. As it decays, the algae use up the oxygen necessary for aquatic life to survive. Some fertilizers also release ammonia, which is toxic to fish. Limit the amount of fertilizer used. Also seeps into groundwater and contaminates drinking water, and destroys soil by killing essential organisms from microbes to earthworms.
Some pesticides are also toxic to humans.
Use sparingly and only as a last resort. Un-bagged trash is easily carried to storm sewers and waterways by wind or rain. Open or overfilled dumpsters easily allow wind or rain to carry trash to waterways. Trash and debris clog storm sewers and waterways, which may cause flooding. Dumpsters in poor condition attract flies and rodents whose waste contaminates collected rainwater that cannot be discharged to creek.