Some lots have very limited effluent dispersal situations. Pressure distribution mound dispersal areas take up quite a bit of space. For difficult soils conditions combined with limited space, drip dispersal can fit in when no other technology will. All effluent dispersed in a drip dispersal system must be "pre-treated" to help keep small orifices from becoming plugged with bacteria and other particulate matter. Drip dispersal systems are manufactured by several different companies. Drip dispersal is approved for use in VT on a new permit or as a replacement system for an existing residence or business.