Emerald City Supporters (ECS) are an independent supporter group of Seattle Sounders FC. Seattle Sounders officially recognise ECS as one of the club’s supporter groups, with the group focused on vocal support and creating matchday atmosphere.
ECS also operates as an umbrella organisation for supporter subgroups and remains central to the Sounders supporter section at Lumen Field. For the 2026 season, Seattle Sounders continue to promote the ECS section and membership alongside the club’s recognised supporter programme.
The group is commonly searched as Emerald City Supporters, ECS Seattle Sounders and Seattle Sounders supporters.