Tungsten is used in several munitions, largely as an alternative to lead or depleted uranium.  Very little quantitative data are available describing the fate, transport and toxicology of tungsten in soil systems.  Tungsten metal in bullets oxidizes to tungsten oxides in soil.  In aqueous solution, tungsten can form a variety of mobile species, generally dominated by the tungstate oxyanion (WO₄⁼), but also can polymerize to polytungstates or heteropolytungstates, and is subject to a variety of surface complexation and mineral precipitation/dissolution reactions.  Column studies with multiple combinations of clean and tungstate-bearing soils were conducted to characterize W leaching from soils in response to changes in aqueous geochemistry, including PO₄^3-, SO₄⁼, Cl^-, and pH of 3 (HNO₃) and 11 (NaOH).  Geochemical reactive transport modeling (PHAST) provides a framework for the integration of expanding data into transparent, internally consistent, conceptual and numerical models.  This ongoing effort will provide decision support tools for risk assessment and abatement related to tungsten in the environment.