Runoff (image) American Chemical Society Caption Polluted runoff originates from several sources, and has been linked to fish kills and a loss of aquatic species diversity. A new study suggests current runoff models may underestimate pollution contributed by homes by up to 50 percent. Credit National Oceanic and Atmospheric Administration Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.