The EUR-OPA Major Hazards Agreement has up to date 25 Member States.

The member States are Albania, Armenia, Azerbaijan, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Georgia, Greece, Luxembourg, Malta, Republic of Moldova, Monaco, Portugal, Romania, Russian Federation, San Marino, Serbia, Slovak Republic, “the former Yugoslav Republic of Macedonia”, Ukraine, and three Mediterranean countries which are not member States of the Council of Europe: Algeria, Lebanon, Morocco.