Besides wasting money, irrigation water that runs off your lawn can cause erosion and carry soil, trash, pet waste and excess fertilizers and pesticides from your lawn into the storm drains and ocean. In addition, it can pick up other pollutants it may encounter on its path to the storm drain system (i.e. trash, chemicals, oils, and dirt/sediment). Trash and decaying plant material can result in harmful bacteria at our beaches. Pesticides can damage important ecosystems and cause health threats. Fertilizers can contribute to excessive plant and algae growth, and dead and/or dying plant material in the water can take the oxygen out of the water and suffocate all other life in the water.