Is ISO 17025 required for a third party lab that is FDA and Health Canada Licensed?

During a GMP audit, it was noted as a non-conformance that the third party lab (used for testing of raw materials and finished excipient products) did not have ISO 17025 accreditation.  The lab is licensed by Health Canada and the FDA through on site inspections and the license indicates that chemical and microbiogical testing is authorized.  Is licensing through the government bodies sufficient for testing on its own or is the lab required to have ISO 17025 certification as well?