This study focuses on evaluating the gas emission from household-scale PE digester systems. Total 05 households who got benefits with PE digester installation from Jircas-CTU project were chosen for onsite survey. At each household, there are 3 gas-meters were installed to record the volume of produced gas, the volume of gas access into gas storage bag, and volume of used gas.  The volume data were written down in the record-sheet everyday by the farmers of the surveyed households. Besides that, the gas from gas storage bag would collect every week for gas composition analysis at the lab. The results show that the gas emission took from 0.12 to 58.11% of produced biogas volume which depends on the head pressure of the gas storage bag and the used gas volume from the households. Therefore, the produced gas should be used much more to limit the emission of methane into the open air as well as reduce the use of fossil fuels.