The IMWQS was based on ASEAN Marine Water Quality Criteria (AMWQC). These criteria have been derived for the specific beneficial uses of the coastal and marine resources of significance in ASEAN marine waters. Four water use Classes have been identified.
In the third quarter of 2011, the Department of Environment awarded a project on “Study on the Establishment of a Marine Water Quality Index”. The purpose of the study is to evaluate and review the current interim standards for Marine Water Quality and to propose the concept and method for formulating a Marine Water Quality Index for Malaysia. The project is expected to end by the third quarter of 2012.