Objective: Description of the knowledge to use the distributed processing of the villagers of the island of Cat Ba, Hai Phong 2015. Subjects and Methods Study: Description cut of 3 households Tran Chau, Xuan Dam, Hien Hao commune was chosen as the subject of investigation. Result: people use septic tanks (59.5 percent), followed by 2 separated toilets (14.6 percent), one of the few still use bucket latrines / 1 compartment (8.6 percent), infiltration excess (7.7 percent). The proportion who said knowledge about the hygiene standards of the septic tank is not high: Distance 10m compared to wells (36.0 percent)
Distance 15m compared housing (36.9 percent)
Button right technical water (20.3 percent)
No flies (25.3 percent), no odor (22.4 percent)
Sufficient water after passing (26.9 percent)
Having cleaned frequently (31.1 percent). The proportion who said knowledge about the hygiene standards of latrine 2 compartment relatively high: Distance 6 m with wells (100.0 percent)
Distribution chamber without cracks, water could not access (83.0 percent)
Fillers, odorless (98.3 percent)
Do not use 2 stop at the same time (67.7 percent).