plant before distributing it to residents and other customers. Its wastewater treatment plant is downstream of the intake. Le Roy also has state permits to discharge effluent into the stream from their wastewater plants, along with the Lapp Insulators plant in Le Roy and the fish hatchery in Caledonia (via the Spring Creek tributary). The latter has the highest permitted discharge of any permit in the Oatka watershed. The villages of Caledonia and Wyoming, and one of Pavilion's water districts, use wells in the watershed. The creek's water quality has been extensively studied in its lower watershed, below Buttermilk Falls. Most chemicals within it are within normal limits, with slightly higher levels of sulfates due to the gypsum and dolomite present in the bedrock. Those minerals also produce detectable magnesium and strontium levels as well. Trichloroethylene is sometimes found as well, the legacy of a spill from a railroad accident near Le Roy in the early 1970s. During high-runoff events, fecal coliform in the lower Oatka sometimes exceeds permitted levels. There are no major issues at present that could significantly degrade water quality on most of the stream. Accordingly, the state's Department of Environmental Conservation (DEC) classifies the Monroe and Genesee sections of the stream as "threatened", since some issues could arise in the future. The Wyoming County portion is considered "stressed", in that while its quality is generally good, occasional issues arise that limit use. In 1999, following a "Caring for Creeks" conference in Rochester, the Oatka Creek Watershed Committee was formed. It sponsored research into the stream and watershed, including the first "State of the Basin" report two years later. Intermunicipal agreements were adopted in 2004, and an outline for an Oatka Creek Watershed Management Plan was adopted in 2006, in cooperation with the Genesee/Finger Lakes Regional Planning Council. Wildlife There is limited data on the fish and plant species that thrive in and around the creek as no comprehensive survey has been done. The state has identified several communities of species it lists as rare, threatened or endangered. To protect them more effectively it has limited publication of the exact species or location of the communities. More specific data exists on benthic macroinvertebrates, or larger organisms that depend on the sediment on the stream floor. These are primarily the immature forms of insects that live on land as adults. Many of these species, such as caddisflies and