CPCB published the first guidelines on continuous online effluent quality monitoring in November, 2014 to facilitate industries in selection of right monitoring system for their matrix of effluent, its installation and data management. The experience gained with CEQMS over the last three years indicates enhanced compliance. The success of CEQMS/CEMS is recognised by SPCBs/PCCs as the system has helped in improving the compliance by the industries. The ground truthing of the values indicated by the online devices has to be done for proper interpretation of data, for which various measures need to be taken at SPCBs/PCCs level also.