ALCOSAN, a.k.a. the Allegheny County Sanitary Authority, holds its annual Open House, the region's largest watershed and environmental festival, featuring treatment plant and laboratory tours, watershed life presentations, hands-on environmental activities, games, food and fun!
9-4 p.m. at the ALCOSAN facility at 3300 Preble Avenue, 15233. Current directions by bus and car are online. The event is free and open to the public. Lots more information can be found here.