Environmental

New Hampshire mandates an 'innovative/alternative' (I/A) septic system in certain environmentally sensitive areas because:

AThey are cheaper than conventional systems
BThey provide additional treatment beyond conventional systems, protecting sensitive water resources✓ Correct
CThey are required for all new construction
DThey are required for properties over 2 acres

Explanation

In areas with poor soil conditions, high groundwater, proximity to wetlands, or other sensitive conditions, NHDES may require I/A septic systems that provide advanced nitrogen or pathogen removal beyond conventional systems.

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