ETC became an accredited private school in 1993
ETC Preparatory Academy is approved or accredited by:
- Northwest Accreditation Commission
- State Board of Education (SBE)
- National Collegiate Athletic Association (NCAA)
- Office of Superintendent of Public Instruction – Non-Public Agency (NPA)
- Non-member affiliate of Pacific Northwest Association for Independent Schools (PNAIS)
- Washington Federation of Independent Schools (WFIS)