The total volumes of sludge delivered to Matang Septic Sludge Treatment Plant by all three local authorities, namely DBKU, MBKS, and MPP, as well as from external parties, namely Majlis Perbandaran Kota Samarahan (MPKS), Majlis Daerah Serian (MDS), Majlis Daerah Bau (MDB), Licentokil (M) Sdn. Bhd.(LTK) and others.