The year was 1890 when men in the master plumbing trade united for a common cause in Ohio. The National Association of Master Plumbers (NAMP) already existed, formed in 1883 by a group of master plumbers for the preservation of their trade.
When the Ohio Master Plumbers Association (OMPA) was formed, it is believed its founders accepted the concept of strength in numbers and felt the need to join together at the state level to address concerns of more localized nature.
The first president for the OMPA was James Allison of Cincinnati, one of the founders of the national association. He also served as national president in 1885-86.