The management of waste tires has become increasingly important in recent years due to the urgency to reduce unsightly tire stockpiles and their environmental hazards. In the past, discarded tires took up space in landfills or became breeding grounds for mosquitoes and rodents and posed problems such as fire hazards, soil contamination, and groundwater intrusion. Recently there has been an aggressive shift in the waste tire market to reduce the burden created by old tires. Research has been focused towards developing innovative ways to eliminate older waste tires and promote alternative uses. One such recycle alternative is the use of Tire Derived Aggregate (TDA) in septic system leachfields. In earlier research conducted at the University at Buffalo, it was determined that leachfields built with TDA operate as effectively as stone aggregate systems with regards to: 1) development of biofilm on the aggregate leading to effective treatment and 2) distribution of the applied wastewater into the surrounding soil matrix. However, a number of questions concerning the long-term capability and functionality of TDA still require evaluation. The goal of this project is to evaluate those questions put forward by professional practitioners, in the literature, and governmental and state agencies. These concerns include: 1) long-term hydraulic permeability, 2) metal leaching from exposed wire corrosion, and 3) long-term TDA integrity. Each of these three issues have been examined in a new project recently conducted at the multi-aggregate aboveground leachfield installed at Modern Corporation’s - Tire Recycling facility in Lewiston, New York. This full scale leachfield allows direct side by side comparison of TDA with natural aggregate (stone) and has been in operation for six years. Collected data were scrutinized with model fitting techniques and statistical hypothesis testing. Findings include similar and even superior hydraulic performance of TDA in both sand and clay based leachfields. In addition, elevated iron and zinc soil concentrations exist at the aggregate/soil interface but reduce to near background concentration within the first 3 to 6 inches below the leaching trenches. Also, hypothesis testing suggests that there is a significant difference of steel wire length protrusions with trench depth on the TDA’s cut edges in the sand based leachfield. This trend is not observed in the clay based leachfield.