Assistant Executive Engineer, Kerala Water Authority, according to which she was given water connection under the domestic category from the date of connection i.e., 19.12.1988 and Residential Certificate was issued by the Thiruvananthapuram Corporation on 24.02.2006, certifying that she had been residing in the address given in the writ petition. Ext.P6 certificate issued by the Thiruvananthapuram Corporation to the effect that the building in question is under the ownership of the petitioner, Ext.P7 certificate issued by the Circle Inspector of Excise on 25.02.2006 to the effect that the petitioner has been residing in the address as per their records are also produced by the petitioner. Therefore, the petitioner claims that change of the tariff should have been effected with effect from the original date of connection, i.e., 29.10.1998 instead of 18.05.2004.