Established in 1925, EcoWater Systems LLC is one of the world's largest manufacturers of residential water treatment systems. ... EcoWater Systems is a member of The Marmon Group, an international association of about 140 business units that operate independently within diverse business sectors. The Marmon Group is a Berkshire Hathaway Company. Simply put, we make the water in people’s lives better by manufacturing highly-engineered, in-home water softening and drinking water solutions. Ecowater is headquartered in Woodbury, MN, and has 3 manufacturing facilities, one in Minnesota and two in Mississippi. read more