Where should nitrification fields and repair areas not be located?

• A. Under paved areas or areas subject to vehicular traffic
• B. In wooded, undisturbed soils
• C. Directly under living space foundations
• D. Adjacent to property lines

Answer: (A)

Nitrification fields and their repair areas must be placed in soil that remains permeable and accessible for proper treatment and maintenance. Paved areas or spots that bear vehicular traffic are off limits because heavy loads compact the soil, drastically reducing infiltration and distribution of effluent and making future repairs difficult or unsafe. In contrast, undisturbed wooded soils can be suitable if the soil conditions meet the drainage and depth requirements, since they’re often more permeable than compacted fill. Placing a field directly under living space foundations is not appropriate due to structural concerns and the need for easy access for maintenance and potential repairs. Proximity to property lines is typically governed by setback rules and can limit the required footprint, so it’s also a factor, but the most clear restriction here is avoiding areas that will be driven over or paved. The take‑away is to keep the nitrification field in permeable, unpaved soil with adequate space for inspection and servicing.