Land treatment , also called application farming, is a disposal method by which a waste containing a listed pollutant is applied or incorporated into soil for biological degradation. This type of disposal method is usually approved under provincial jurisdiction. If an NPRI substance is transferred off site for land treatment, it is reported as an off-site transfer for disposal. A leak differs from a spill in terms of the time required for an event. Spills normally occur over a period of hours or days, whereas leaks occur over a period of days or months.
Underground injection is another method of waste disposal.
Subject to provincial regulation, liquid wastes are injected into known geological formations, generally at great depths. This total does not include any waste that is transferred off site, so it does not include any environmental releases that may occur as a result of off-site disposal or treatment. Facilities must provide the name and location of the off-site facility receiving the shipment. Information on off-site transfers for disposal includes treatment and disposal methods. Off-site treatments do not necessarily constitute an environmental release because the pollutant may be altered chemically or physically, and may not be ultimately released in its original form.