North Carolina Septic System Guide

How onsite systems are regulated in North Carolina

Onsite wastewater systems in North Carolina are governed by state rules — 15A NCAC 18E, the subchapter covering wastewater treatment and dispersal systems — published by the Department of Health and Human Services, Division of Public Health. Those rules set the framework for how systems are evaluated, permitted, installed and operated.

Administration happens locally. County health departments, through their Environmental Health divisions, handle applications, site evaluations, permits and inspections for systems in their jurisdiction. That is why the practical experience of replacing a septic system differs between counties even though the underlying state rules are the same.

The role of county Environmental Health

• Receiving and reviewing applications relating to onsite wastewater systems.
• Conducting or reviewing site and soil evaluations.
• Issuing the permits and authorizations required before a system is installed, repaired or replaced.
• Inspecting installations before they are covered and placed into service.
• Holding permit records for existing systems, which homeowners can request.
• Responding to reports of failing systems.

How a repair or replacement typically proceeds

1. 1Symptoms appear — wet ground, odor, slow drains or a backup.
2. 2A qualified septic professional inspects the system to determine which component has failed.
3. 3If the fault is a component, repair follows; requirements for county involvement depend on the nature of the work.
4. 4If the soil treatment area has failed, a site and soil evaluation establishes what the property can support.
5. 5A system is designed for the site, and county approval is obtained before installation.
6. 6The work is installed and inspected, then placed into service.

Site and soil evaluation

Whether a property can support a particular type of system depends on its soil and site characteristics. Evaluation looks at factors such as soil texture and structure, depth to a limiting condition, slope, drainage and available space. The outcome shapes both the system type and its size, and it is the reason two neighbouring properties can be quoted very differently.

Repair areas

Onsite system designs normally account for an area held in reserve for future repair or replacement of the soil treatment area. Building over that area, paving it, planting large trees in it or using it for storage can limit the options available later. If you are unsure where yours is, the permit record for the system is the place to start.

Certification of professionals

North Carolina certifies onsite wastewater contractors and inspectors through a state board established under Article 5 of Chapter 90A. Verifying that whoever you hire holds appropriate certification for the work is straightforward and is one of the more useful protections available to a homeowner.

System types you may encounter

Not every property has the same kind of system. Conventional gravity systems, pump-assisted systems, pressure distribution and engineered or alternative designs all exist across the state, and which one a property has affects maintenance obligations, repair options and replacement cost.