Which statement correctly contrasts operator oversight between Type 1–3 and Type 4–6 systems?

• A. Type 1–3 are typically operated by the owner, while Type 4–6 are operated by a public management entity.
• B. Type 1–3 require a private certified operator; Type 4–6 require an owner.
• C. Type 1–3 are not regulated; Type 4–6 are regulated.
• D. Type 1–3 require no operator; Type 4–6 require a licensed engineer.

Answer: (A)

In North Carolina, who oversees and operates onsite wastewater systems depends on the system type. Type 1–3 are typically residential, privately owned systems operated by the property owner (or a private service contractor hired by the owner). The owner bears responsibility for maintenance and ensuring the system functions properly, rather than a public entity managing day-to-day operation. Type 4–6, by contrast, involve larger or community-scale systems that are operated by a public management entity (such as a municipality or utility) with an assigned operator to ensure regulatory compliance and proper functioning.

This distinction is what makes the statement correct: private ownership and operation for Type 1–3 vs public-management oversight for Type 4–6. The other options misstate who oversees or maintains these systems—either implying private operators for larger public systems, suggesting no regulation, or requiring engineers rather than a public operator.