Ansonia, Ohio is a small village located in Darke County with a population of approximately 900 people. The climate in Ansonia is classified as a humid continental climate with warm summers and cold winters. The village sits near the headwaters of the Stillwater River, a tributary of the Great Miami River, which provides plenty of aquatic recreation opportunities such as fishing and kayaking. The area is also home to numerous parks and natural areas, including the 2,000-acre Greenville Creek Wildlife Area and Shawnee Prairie Preserve. Hiking, birdwatching, and hunting are popular activities in these areas. The primary hydrology constituents in the area are nitrates and phosphates, which can come from agricultural runoff.