NC Septic Installer License Levels: Complete Guide to Level II and Level IV Requirements
NC Installer License Levels define exactly what types of systems a professional can install and outline the pathway for advancing in the industry.
North Carolina is one of the few states with a structured, tiered licensing system for onsite wastewater system installers. These license levels—known as Grade Level II and Grade Level IV—define exactly what types of systems a professional can install and outline the pathway for advancing in the industry.
Whether you’re just entering the field or preparing to move into more advanced system types, understanding these levels is essential for compliance, career growth, and professional credibility.
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Why Installer Grades Matter
Installer grade levels are designed to:
- Match installer qualifications with system complexity
- Protect public health and water quality
- Ensure systems are installed correctly the first time
- Create a clear professional development pathway
- Provide consumers and regulators confidence in who is doing the work
North Carolina’s licensing structure is overseen by the NC Onsite Wastewater Contractors & Inspectors Certification Board (NCOWCICB), and all certified installers must follow the Board’s requirements for education, exams, and continuing education.
Grade Level II — Standard Installer License
(Every installer begins here)
The Grade Level II (Standard) license is the entry point for all new installers in North Carolina. Once professionals complete the required training and exam, they are authorized to install a broad range of conventional and simple pump systems.
What Systems You Can Install at Level II
A Grade Level II license covers any approved gravity or single-pump dispersal system not included in Grade Level IV. These include:
- Conventional gravity systems
- Systems with a single pump or single siphon
- Sand-lined trench systems
- Grease traps
- Fill systems
- Multiple tanks used in standard configurations
These system types make up the majority of installations statewide, which means Level II installers can immediately enter the workforce and perform meaningful work.
Education Requirements
Exam Requirements
- 50-question multiple-choice exam
- Administered by the NCOWCICB
- Passing the exam and completing the class results in Level II licensure
Grade Level IV — Unlimited Installer License
(For experienced, career-level professionals)
The Grade Level IV (Unlimited) license represents the highest credential for installers in North Carolina. It qualifies professionals to install every type of onsite wastewater system recognized in the state—including large, complex, and advanced treatment technologies.
What Systems You Can Install at Level IV
The Level IV credential covers all system types, including:
- Large (>3,000 GPD) systems
- Off-site or multiple-site systems
- Industrial process wastewater systems
- Advanced treatment units (ATUs)
- Drip dispersal systems
- Wastewater reuse systems
- Any subsurface wastewater system approved in North Carolina
This is the license held by many of the state’s most experienced installers, engineers, and specialty contractors.
Education Requirements
Before taking the Level IV exam, installers must complete:
- A 6 hour Level IV Advanced Systems Course
- These hours are in addition to the required CE for that calendar year.
Experience Requirements
To qualify for Level IV:
- Minimum of 2 years of documented experience as a Level II Installer
Exam Requirements
- 50-question multiple-choice exam
- Administered by the NCOWCICB
- Passing allows full upgrade to the Level IV Unlimited Installers License
Choosing Your Path in the Industry
Whether you’re just beginning with Level II or aiming for the Unlimited Level IV credential, North Carolina’s graded structure creates a clear path toward higher responsibility and larger business opportunities.
Onsite Wastewater Professionals (OWP) provides the state-approved training and exam preparation needed for both levels—including the 24-Hour Installer Course for Level II and the Advanced Systems Course for Level IV candidates.
Ready to begin or advance your installer career in North Carolina?
Explore upcoming classes:
