WCASI is a non-profit organization formed in 1976 by a group of die-hard slo-pitch softball players who wanted to start a softball league in Walnut Creek. Still going strong after almost 5 decades, WCASI offers ASA/USA slo-pitch leagues for men's and co-ed teams. We offer a Spring/Summer league (14 games plus double elimination playoffs) and a Fall league (7 games plus single elimination playoffs). We play Sunday - Friday at Heather Farm park. Come join us!