Nitrogen uptake may be greater for drip irrigation systems as compared with some other subsurface disposal systems since the wastewater is applied at a controlled and fairly slow rate in the plant root zone. Pretreatment units, including adequate filtration, and pumping system components and controls must be adequately maintained for subsurface drip irrigation systems to continue functioning properly. This technology has been shown to be reliable as long as the system is adequately maintained and a reliable source of power is available. Other types of pretreatment units and processes will require maintenance of some type. For the drip irrigation system, filters must be routinely backflushed or otherwise cleared of trapped particles.
Pumps require either periodic maintenance or repair, or replacement.
Electrical and mechanical components of the pump control and alarm system may also need occasional repair or replacement. Improperly sited, designed, constructed or maintained subsurface disposal systems may contaminate ground or surface water. For a flow of about 300 gpd, this would be about 0.193 KWH of energy per day. Aesthetic Considerations Subsurface pressure dosing absorption trenches are typically not visible on the site. Drip irrigation systems may be placed around trees and landscaped areas.