2015 ALCOSAN Open House Saturday, September 19, 2015 marks the return of ALCOSAN’s annual award-winning Open House event, FREE and open to the public from 9:00 a.m. to 4:00 p.m., rain or shine!  Join us for the region’s largest watershed and environmental festival, featuring hands-on environmental exhibits, treatment plant and laboratory tours, microbiology and watershed life demonstrations, […]