The NGO SOIL in Haiti began building UDDTs and composting plants in Port-au-Prince as part of the 2010 Haiti earthquake emergency relief effort in northern Haiti . They have since branched out into providing toilets for residential use , this being their primary goal moving forward as they transition their focus from emergency relief to providing sustainable and ecological sanitation for paying customers . Their current dry toilet design for households includes a small portable single vault unit made out of wood that is either fitted with a single container for combined excreta collection or with a urine diversion insert , with 80 % of these installations currently being of the UDDT type . As of 2014 , SOIL has transformed all of their public UDDT vault toilets to an open vault design with removable plastic drums for feces collection . This improves the processes by which feces is collected and transported to their waste treatment facility , making their business now a fully " container-based system " . This allows SOIL to respond to heavy use ( since their toilets were filling up too quickly ) and ensures a safe final product for reuse . In most cases , these UDDTs utilize soak pits ( normally located directly beneath the toilet superstructure ) for onsite disposal of urine
2010 Haiti earthquake
2010 Haiti earthquake
Urine-diverting dry toilet