Ranipet Tannery Effluent Treatment Co. Ltd. (CETP-RANITEC), Ranipet & Melvisharam Tanneries Effluent Treatment Co. Pvt. Ltd. (CETP-Melpudupet)
Pallavaram Tanners Industrial Effluent Treatment Co. Ltd. (CETP-PTIETC), Pallavaram
Ranipet SIDCO Finished Leather Effluent Treatment Co. Ltd. (CETP-SIDCO-I), Ranipet
SIPCOT & SIDCO Phase II Entrepreneur Finished Leather Effluent Treatment Co. (P) LTd. (CETP-SIDCO-II), Ranipet
Talco Pernambut Tannery Effluent Treatment Co. Ltd. (CETP-PERTEC), Pernambut
Talco Dindigul Tanners Enviro Control System Pvt. Ltd. (CETP-DINTEC), Dindigul
ZLD system in the six CETPs operated by the above companies were established by upgradation, addition and modernisation of the existing CETPs.