Laboratories currently holding accreditation or certification from a nationally-recognized organization, such as the AASHTO Accreditation Program, may apply for reciprocal certification through CTTP.
Reciprocal certifications are approved for a period of two years (based on the date of the original laboratory Agreement), with associated annual fees. If at any time the primary certification lapses or the laboratory is suspended, the CTTP certification will also be suspended.
On-site inspections are not required for laboratories requesting reciprocal certification. However, reciprocal certifications shall only include the test method(s) included in the certification by the other accrediting body. This may result in state-specific test methods being unavailable to reciprocal laboratories.