The sewerage system in the city was implemented at the time of the Travancore Kingdom, and modernised in 1938. This scheme for the disposal of sullage and sewage is an underground system. The whole system is controlled by Kerala Water Authority now. The city area is divided in to seven blocks for the execution of the sewerage system, two commissioned in the 1990s and two after 2000. The sewerage is pumped to a stilling chamber at the Sewerage Treatment Plant (STP) at Valiyathura, and is disposed through sewage farming. Diary Development Department maintains this sewage farm and fodder cultivation is done here. There is no revenue generation from this scheme, and the sewerage system in the city is a service provided to the residents.