The club currently competes in the local Rethymno FCA A Division, having previously played for several seasons in the Gamma Ethniki, the third tier of the Greek football league system.

[1] Over the years, the club ascended to the top-level Rethymno FCA Regional Championship, which the club won during the 2011−2012 season to earn promotion to its first ever national competition, the Delta Ethniki, which used to be the fourth tier of the Greek football league system.

[1] The club failed to avoid relegation in its inaugural season in the competition,[2] but managed to make a swift return by once again winning the 2014−2015 Rethymno FCA Championship.

[3] In the 2015–16 Gamma Ethniki season, the club finished 6th in Group 4, thus staying clear of relegation.

Ermis actually managed to claim an impressive victory over OFI Crete during the 2015–16 Gamma Ethniki, recording a 1−0 home win on 22 November 2015.