The AMPP Cathodic Protection certification program consists of four progressive levels: CP 1 (Tester), CP 2 (Technician), CP 3 (Technologist), and CP 4 (Specialist). Each level represents a deeper degree of technical responsibility, analytical skill, and decision-making authority.
This guide explains the differences between CP 1, CP 2, CP 3, and CP 4 so you can understand where you fit — and what comes next.
Quick Comparison Overview
| Level | Primary Focus | Responsibility Level | Design Authority |
|---|---|---|---|
| CP 1 | Field measurement | Entry-level technician | No |
| CP 2 | System evaluation | Intermediate technician | Limited |
| CP 3 | System design & analysis | Engineering-level technologist | Yes (within scope) |
| CP 4 | Advanced design & forensic authority | Senior specialist / consultant | Yes (advanced) |
CP 1 – Cathodic Protection Tester
CP 1 focuses on accurate data collection and proper testing procedures. It is the foundation for all higher certifications. Read full CP 1 guide →
CP 2 – Cathodic Protection Technician
CP 2 expands into interpretation and troubleshooting. The technician must understand polarization, IR drop, and interference fundamentals. Read full CP 2 guide →
CP 3 – Cathodic Protection Technologist
CP 3 moves into system design, quantitative analysis, and current requirement calculations. It represents engineering-level competency. Read full CP 3 guide →
CP 4 – Cathodic Protection Specialist
CP 4 represents advanced authority in design, interference mitigation, forensic investigation, and technical leadership. Read full CP 4 guide →
Career Progression Path
- Begin with CP 1 to establish measurement competence
- Advance to CP 2 to develop evaluation skills
- Achieve CP 3 to perform system design and analysis
- Pursue CP 4 to operate at specialist authority level
Which Certification Should You Choose?
Your appropriate level depends on your current experience, daily job responsibilities, and long-term career goals.
- If you primarily perform field testing → CP 1 or CP 2
- If you design systems or perform calculations → CP 3
- If you lead design reviews or forensic investigations → CP 4