Which regulation applies to evaluating the site for septic systems in New Jersey?

• A. NJAC 7:9A-4.1
• B. NJAC 7:9A-3.1
• C. Local ordinance
• D. EPA standards

Answer: (A)

Evaluating a site for a septic system in New Jersey is governed by the state’s onsite wastewater rules, and the specific section that lays out how to perform a site evaluation is NJ Administrative Code 7:9A-4.1. This part spells out the criteria and methods for assessing soil conditions, percolation, groundwater depth, slopes, setbacks, and the required documentation to determine if a site is suitable for an OWTS. That specificity makes it the best answer because it’s the official regulation that prescribes the exact evaluation process used by local health departments and designers. Local ordinances may add requirements, but they don’t replace the state rule. EPA standards provide federal guidelines, not the binding NJ-specific site evaluation criteria.