Drip Distribution System

A drip distribution system is a final effluent disposal method that uses small-diameter polyethylene drip tubing (typically 0.5 to 0.625 inches) installed in shallow trenches (6 to 12 inches deep) to distribute pre-treated effluent across a wide area with extreme precision. Borrowed from agricultural irrigation technology, drip distribution delivers small, timed doses of effluent directly to the root zone of the soil, where aerobic bacteria complete the treatment process. The tubing contains pressure-compensating emitters spaced every 2 feet that deliver a uniform flow rate regardless of elevation changes — a critical advantage on sloped or uneven terrain where gravity-fed systems fail. Because the tubing is shallow and flexible, drip fields can be installed around trees, along property boundaries, on hillsides, and in irregularly shaped areas that cannot accommodate conventional trench drain fields. Drip systems require a higher level of pre-treatment than conventional drain fields — typically an ATU or sand filter — because the small emitter orifices (0.5-1.0 GPH) are susceptible to clogging by solids and biofilm. A headworks unit with disc filters, flush valves, and a pressurization manifold are essential components. Despite the higher complexity and cost, drip distribution is the most versatile disposal method available and is increasingly specified by engineers for difficult sites where no other option will work.