Pesticides. Run-off from farms, backyards, and golf courses contain pesticides such as DDT that in turn
contaminate the water. Leechate from landfill sites is another major contaminating source. Its effects on the
ecosystems and health are endocrine and reproductive damage in wildlife. Groundwater is susceptible to
contamination, as pesticides are mobile in the soil. It is a matter of concern as these chemicals are persistent in
the soil and water.