A C3PAO (CMMC Third-Party Assessment Organization) is an independent organization accredited by the Cyber AB to conduct formal CMMC Level 2 assessments of defense contractors. C3PAOs employ Certified CMMC Assessors (CCAs) who evaluate whether organizations have properly implemented the 110 security requirements from NIST SP 800-171. The C3PAO submits assessment results to the CMMC eMASS system, which the DoD uses to make certification decisions.

Can PTG perform my C3PAO assessment?

No. PTG is a Registered Practitioner Organization (RPO), not a C3PAO. The CMMC ecosystem intentionally separates consulting (RPO) from assessment (C3PAO) to prevent conflicts of interest. PTG prepares you for the C3PAO assessment through gap analysis, remediation, documentation, mock assessments, and ongoing managed security. We then refer you to an accredited C3PAO for the formal assessment. This separation ensures the assessment is objective and credible.

How long does the C3PAO assessment take?

The on-site assessment typically takes three days for small to medium organizations. Larger organizations or those with multiple locations may require four to ten days. The complete process, including pre-assessment document review, on-site assessment, report preparation, and certification decision, spans approximately four to eight weeks from start to final determination.

What happens if my organization fails the C3PAO assessment?

If the assessment reveals a limited number of NOT MET findings, the C3PAO may issue a conditional certification with a 180-day window to remediate the gaps. If the findings are too numerous or severe for conditional status, certification is denied and the organization must remediate and schedule a new assessment. PTG handles all post-assessment remediation, whether for conditional close-out or full reassessment preparation.

How often do we need to be reassessed by a C3PAO?

CMMC Level 2 certification is valid for three years. Organizations must undergo a new C3PAO assessment every three years to maintain certification. Between assessments, organizations must conduct annual self-assessments and maintain their security posture. PTG's ongoing managed security services ensure continuous compliance between C3PAO assessments.

What is the difference between a C3PAO assessment and a DIBCAC assessment?

C3PAO assessments are conducted by accredited third-party organizations for CMMC Level 2 certification. DIBCAC (Defense Industrial Base Cybersecurity Assessment Center) assessments are conducted by the government for CMMC Level 3 certification and for high-confidence assessments. DIBCAC assessments are generally more rigorous and are reserved for organizations supporting the most sensitive defense programs. PTG prepares organizations for both assessment types.

Can I choose which C3PAO assesses my organization?

Yes. Defense contractors select their own C3PAO from the Cyber AB Marketplace. You should evaluate C3PAOs based on industry experience, geographic availability, scheduling capacity, and references. PTG can recommend C3PAOs based on your specific requirements, though the final selection is always the contractor's decision.

What do I need to have ready before scheduling a C3PAO assessment?

Before scheduling, you should have a completed System Security Plan (SSP) that accurately describes your environment, all 110 NIST SP 800-171 requirements implemented (or documented in a POA&M with credible remediation plans), organized evidence for every control, current vulnerability scan results, a valid SPRS score submitted to the DoD, and personnel who are prepared for assessor interviews. PTG's readiness engagement produces all of these deliverables.

How does the SPRS score relate to the C3PAO assessment?

The Supplier Performance Risk System (SPRS) score reflects your self-assessed implementation of NIST SP 800-171 requirements, scored on a scale of -203 to 110. Defense contractors must submit their SPRS score to the DoD as a condition of contract award. The C3PAO assessment independently validates this self-assessment. Discrepancies between your reported SPRS score and the C3PAO's findings can have serious consequences, including potential False Claims Act implications. PTG ensures your SPRS score accurately reflects your implementation status before you submit it. Use PTG's free SPRS calculator to estimate your current score.

C3PAO Assessment

C3PAO Assessment Guide Pass Your CMMC Assessment the First Time

Q: How much does a C3PAO assessment cost?

C3PAO assessment fees typically range from $50,000 for small organizations with simple environments to $200,000 or more for large organizations with complex assessment boundaries. The cost depends on the number of assets in scope, the number of locations, the complexity of the technical environment, and the C3PAO's pricing structure. These fees cover only the formal assessment; preparation costs (gap analysis, remediation, documentation) are separate and typically represent a larger investment than the assessment itself.

A C3PAO is an independent organization accredited by the Cyber AB to conduct formal CMMC Level 2 assessments. PTG is an RPO that prepares your organization for assessment success.

CMMC Registered Practitioner Org | BBB A+ Since 2003 | 23+ Years Experience

Start CMMC Readiness Assessment Call 919-348-4912

Key Distinction

RPO vs. C3PAO: Two Complementary Roles

The CMMC ecosystem separates consulting from assessment to ensure objectivity. PTG advocates for your success; the C3PAO provides independent validation.

RPO (Petronella Technology Group)

Gap analysis, remediation, and SSP development
Mock assessments that simulate the C3PAO process
Ongoing managed security and compliance monitoring
Advocates on your behalf throughout the process

C3PAO (Assessment Organization)

Conducts the formal CMMC Level 2 assessment
Accredited by the Cyber AB, ISO 17020 compliant
Certified CMMC Assessors (CCA) on staff
Maintains independent objectivity throughout

Process

How the C3PAO Assessment Works

Pre-assessment planning: scope, schedule, and team confirmed

Document review: SSP, POA&M, policies examined before on-site

On-site assessment: 3-5 days of observation, testing, and interviews

Evidence collection: configurations, logs, training records validated

Findings report: MET/NOT MET status for every requirement

Certification decision: full, conditional (180-day POA&M), or not certified

Readiness Services

How PTG Prepares You for C3PAO Success

Our readiness services ensure no surprises on assessment day.

Mock Assessments

Full simulation of the C3PAO process using the same methodology and scoring criteria. We identify and resolve deficiencies before assessors arrive.

Evidence Organization

Structured evidence packages for every control requirement so assessors can quickly validate MET status. Incomplete documentation is the top cause of findings.

Personnel Coaching

Interview preparation for IT staff, system admins, security officers, and end users who will face assessor questions about control implementations.

Post-Assessment Support

If conditional certification is issued, we handle POA&M remediation within the 180-day window and provide ongoing monitoring to maintain compliance.

FAQ

Frequently Asked Questions

What is a C3PAO?

A CMMC Third-Party Assessment Organization (C3PAO) is an independent entity accredited by the Cyber AB to conduct formal CMMC Level 2 assessments. C3PAOs send certified assessors to evaluate whether your security controls are implemented, documented, and operational against all 110 NIST SP 800-171 requirements.

When will C3PAO assessments be required?

Phase 2 of the CMMC rollout (2026) requires C3PAO assessments for contracts involving critical national security CUI. Phase 3 (2027) expands the requirement, and Phase 4 (2028) achieves full inclusion across all applicable contracts. Many prime contractors are already flowing down CMMC requirements ahead of the formal timeline.

How much does a C3PAO assessment cost?

C3PAO assessment fees typically range from $50,000 to $200,000+ depending on organizational size, scope, and assessment duration. This is separate from preparation costs. Failed assessments requiring reassessment can cost an additional $30,000 to $150,000, which is why thorough RPO preparation is critical.

Can PTG also serve as our C3PAO?

No. The CMMC ecosystem requires separation between consulting (RPO) and assessment (C3PAO). PTG cannot assess organizations we consult for. This separation ensures assessment objectivity and benefits you directly: we advocate for your success during preparation, and the C3PAO provides independent validation.

What happens if we fail the C3PAO assessment?

There are three outcomes: full certification (3 years), conditional certification (180-day POA&M window for limited items), or not certified (requiring significant remediation and reassessment). Our mock assessment process is designed to prevent failures by catching deficiencies before the formal evaluation.

How far in advance should we start preparing?

We recommend beginning readiness work at least 12 months before your anticipated C3PAO assessment. Start with a gap assessment to understand your current posture, then allow 6-12 months for remediation before scheduling the formal assessment.

Get Started

Start Your C3PAO Readiness Engagement

Our CMMC Registered Practitioners will assess your current posture and build a realistic readiness roadmap tailored to your contract timeline.

Schedule Free Consultation Call 919-348-4912