The Water Research Field Station (WRFS) and the Artificial Stream Facility are two of the few facilities in the nation designed to assess, under field conditions, the effects of new chemicals and pesticides on aquatic ecosystems prior to their use in the general environment. The Water Research Field Station consists of 48 aquatic testing ponds of 0.1 acre each and 52 1,000- and 10,000-liter microcosms. The Artificial Stream Facility has 12 replicate five-meter streams, each capable of being colonized by aquatic species. The WRFS is specifically designed to assess the impacts of agrichemicals on aquatic populations and communities before they are used in the general environment. The field station and stream facility are supported on campus by a biological and residue analysis laboratory with state-of-the-art equipment such as computer interfaced gas chromatographs.