Grade 1 Referees: Referees who officiate in the World Cup and international matches are designated as Grade 1.
Grade 2 Referees: Assistant Referees to Grade 1 Referees are designated as Grade 2.
Grade 3 and 4 Referees: In the United States, competition at the national level (including professional soccer and MLS) requires Grade 3 or 4. Grade 3 indicates the referee's readiness to be considered for international service.
Grade 5 and 6 Referees: The highest level of competition within a state (amateur leagues beyond youth) requires a Grade 5 or 6 where Grade 5 indicates the referee's readiness to be considered for national service.
Grade 7 Referees: Grade 7 is an experienced referee in the state qualified to officiate all but the highest levels of amateur soccer.
Grade 8 Referees: Grade 8 referees are certified to work all levels of youth games from recreational to competitive. Grade 9 referees can upgrade to a Grade 8 referee by going to a locally hosted session to complete the necessary in person training that proves general proficiency.
Grade 9 Referees: New referees can take an online clinic to become certified to work recreational matches under the age of 14.