Editor's note: The use of trade names is for descriptive purposes only, and does not imply particular endorsement by the authors or SEG.

Many people (e.g., 25% of the U.S. population) use septic systems for wastewater disposal. In the United States, county health departments typically are responsible for overseeing the installation and operation of these systems. Because most systems rely on the soil to absorb the wastewater, special attention is required where the hydraulic permeability of soils may allow contamination to reach either the surface or a nearby aquifer. Electromagnetic induction (EMI) provides an efficient means for observing septic system...

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