[1] Mandurah City were the 2015 champions but did not meet all of the Football West eligibility criteria to be promoted to the 2016 National Premier Leagues WA.
After review by Football West the 2019 NPLWA season was decided to return to a 12 team competition; as a result, Subiaco AFC, Forrestfield United and Joondalup United were relegated and Rockingham City were promoted.
[4] In 2020, promotion and relegation was suspended for the season, due to the impacts on the competition from the COVID-19 pandemic in Australia.
Promotion for the Champion of Division 1 to the National Premier Leagues Western Australia (NPL WA) was introduced for the 2015 season, and is subject to eligibility criteria.
In 2020, promotion and relegation was suspended for the season, due to the impact on the competition from the COVID-19 pandemic in Australia.